POTASSIUM PERSULFATE

Potassium Persulfate, also known as Potasyum Persülfat, Potassium Peroxydisulfate, Potassium Peroxodisulfate, Dipotassium Peroxydisulfate, Potassium Persulphate, KPS and CAS No. 7727-21-1, is an inorganic peroxide salt with the formula K₂S₂O₈ that has a white crystalline structure, is non-hygroscopic, offers the highest storage stability among the persulfate salts and has a strong oxidizing character; it is used particularly as a radical initiator in emulsion polymerization, as the main oxidizing component in hair bleaching powders, as a gel breaker in oil and gas fields, as an oxidation reagent in organic synthesis, in starch modification, in textile processing and in laboratory analyses.
Potassium Persulfate, or KPS by its commercial abbreviation, is regarded as one of the most preferred persulfate salts, especially in powder formulations and ammonia-free polymerization systems, thanks to its low tendency to absorb moisture, its ability to remain stable in solid form for long periods without losing active oxygen, its ability to generate free radicals in a controlled manner and the fact that it contains no ammonium.
Polymerization, bleaching and oxidation systems containing Potassium Persulfate in their formulations contribute to the reliable performance of critical process steps such as the initiation of polymer chains, the oxidative lightening of pigments and the controlled breakdown of organic matter, thanks to the sulfate radicals formed when the peroxydisulfate ion decomposes under heat or with reducing activators.
The use of this Potassium Peroxydisulfate-based raw material in formulations can provide functional benefits such as high conversion rates and low residual monomer in emulsion polymers, stable lightening power throughout shelf life in hair bleaching powders, timely breaking of fracturing fluids in oil wells, the execution of selective oxidation reactions in organic synthesis and the reduction of starch to the desired viscosity.
Potassium persulfate acts through both radical chemistry and direct oxidation reactions, owing to its structure consisting of two potassium cations and a peroxydisulfate anion in which two sulfate groups are linked by a peroxide bridge, its high standard reduction potential and the sulfate radical anions (SO₄•⁻) formed by homolytic cleavage of the O–O bond.
In the cosmetics and personal care sector, grades of suitable purity may be included under the INCI name Potassium Persulfate in hair bleaching powders, lightening boosters and some hair coloring systems; in formulations using Potassium Persulfate, correct grade selection is decisive for the performance of the final product, user safety and regulatory compliance.

Potassium Persulfate is a functional raw material used to help reduce problems such as low conversion and high residual monomer in emulsion polymerization, declining lightening power and caking over shelf life in hair bleaching powders, unbroken gel residues in the oilfield, high viscosity in starch processing and insufficient oxidation in organic synthesis.
Potassium persulfate reacts in a controlled manner with the monomers, pigments or organic molecules in the medium, initiating polymerization, accelerating the oxidation of color pigments such as melanin and oxidatively cleaving organic chains such as polysaccharides.
It is a functional and reliable component in polymer, cosmetic, oilfield, organic synthesis and chemical process formulations that, thanks to its high storage stability and easy dosing, helps keep process efficiency and end-product quality at the desired level.
Systems containing Potassium Persulfate support the achievement, for the end user, of more stable paint and adhesive dispersions, longer-lasting and more effective hair bleaching products, more productive oil and gas wells, more consistent paper coating starches and more reproducible laboratory results.

Potassium Peroxodisulfate is an effective inorganic raw material that can simultaneously support multiple performance properties in different processes thanks to its high oxidation potential, low hygroscopic character and radical-generating capacity that can be activated by heat or redox systems.
Thanks to its ability to be stored stably in solid form without absorbing moisture and its effectiveness across a wide range of applications, potassium persulfate helps meet multiple needs such as polymerization initiation, hair lightening, bleaching, depolymerization, oxidative degradation, organic synthesis and analytical oxidation, compared with alternatives that have only a single function.
It can be evaluated in acrylic, styrene-acrylic, styrene-butadiene, nitrile and vinyl acetate emulsion polymerization, emulsifier-free polystyrene latex synthesis, polyacrylamide gel preparation, hair bleaching powders, gel breakers in hydraulic fracturing fluids, starch oxidation, textile desizing, Elbs and Boyland–Sims oxidations in organic synthesis and laboratory analyses, while grades of suitable purity can also be used in cosmetic products.
Potassium Persulphate helps formulators develop efficient and reproducible processes, while offering manufacturers practical benefits such as a free-flowing crystalline form, low tendency to absorb moisture, long shelf life, consistent active oxygen content, easy dosing and compatibility with other powder raw materials.

WHAT IS POTASSIUM PERSULFATE?

Potassium Persulfate, also known in industrial chemistry as Potasyum Persülfat or Potasyum Peroksidisülfat (potassium peroxydisulfate), is the dipotassium salt of peroxydisulfuric acid with the molecular formula K₂S₂O₈. Potassium Persulfate is also referred to by names such as Potassium Peroxydisulfate, Potassium Peroxodisulfate, Dipotassium Peroxydisulfate, Dipotassium Peroxodisulfate, Potassium Persulphate, Peroxydisulfuric Acid Dipotassium Salt and, in short, KPS. Commercially, it is generally supplied as a white crystalline powder or granules, in different purity grades and with different particle size distributions.
In particular, it may exhibit different process behavior in different applications depending on its purity (assay), active oxygen content, moisture, iron, copper and other heavy metal impurities, chloride content, amount of insoluble matter and particle size. Expressions such as Potassium Persulfate 99%, Potassium Persulfate 99.5%, KPS Technical Grade, Polymer Grade Potassium Persulfate, Cosmetic Grade Potassium Persulfate and Potassium Persulfate ACS Reagent are terms that may be encountered in technical and commercial searches. However, these expressions do not describe the same product in every case. For example, a technical grade potassium persulfate and a cosmetic grade potassium persulfate, while having the same chemical structure, are two separate commercial grades with very different impurity limits, documentation requirements and intended uses.
In commercial language, the term "potassium persulfate" is most often confused with potassium monopersulfate. Potassium monopersulfate (potassium peroxymonosulfate) is a KHSO₅-based triple salt mixture used in pool shock oxidation, denture cleansers and disinfection products, and is chemically a different product from Potassium Persulfate. Similarly, sodium persulfate, ammonium persulfate and ready-made persulfate-containing hair bleaching blends, although related to Potassium Persulfate, are separate products. The product covered on this page is pure potassium peroxydisulfate. Therefore, which product is meant must always be clarified during ordering and quotation processes.
However, not all Potassium Persulfate products on the market have the same technical properties or the same process behavior. The product's actual purity, active oxygen content, moisture content, iron and heavy metal content and particle size can significantly change its performance in polymerization, hair bleaching or synthesis applications. Therefore, it should not be assumed, simply by looking at the product name "Potassium Persulfate" or "Potasyum Persülfat", that products from different manufacturers can be technically used interchangeably.
Potassium persulfate is a single defined inorganic compound and is the most stable of the persulfate salts in the solid state; however, in aqueous solution it undergoes slow decomposition over time and with temperature. During this decomposition, potassium bisulfate and oxygen are formed; therefore, the pH of the solution decreases over time and its active oxygen content declines. This structural characteristic is the main reason why Potassium Persulfate solutions are generally prepared fresh before use and the solid product is stored in a dry environment.
Potassium Persulfate can be used in particular as an initiator in emulsion polymerization, as the main oxidizing component in hair bleaching products, as a gel breaker in the oilfield, as an oxidation reagent in organic synthesis and as an oxidizing component in starch, textile and analytical chemistry applications. Depending on the application, more specific product definitions such as technical grade, polymer grade, cosmetic grade or analytical grade may be used.
The performance of Potassium Peroxydisulfate does not depend solely on its chemical identity. Purity, active oxygen content, moisture, iron, copper, chloride and particle size can affect the formulation and process outcome. Therefore, two potassium persulfate products sold under the same name may not have the same polymerization rate, hair lightening performance, storage stability or behavior in cosmetic formulations.

Potassium Persulphate can be evaluated, depending on the grade, in applications such as emulsion polymers, synthetic rubber latexes, water-soluble polymers, hair bleaching and coloring products, hydraulic fracturing fluids, starch and paper processing, textile processing, organic synthesis and laboratory analyses. Its most common uses are as a water-soluble radical initiator in emulsion polymerization and as the main persulfate component in hair bleaching powders.

Thanks to this radical-generating and oxidation potential in its chemical structure, Potassium Persulfate forms sulfate radical anions, especially when heated or when it encounters a reducing activator; these radicals add to monomers to initiate polymer chains or oxidize organic and inorganic substrates. Defined in industry by different functional names such as polymerization initiator, bleaching agent, oxidizing agent and gel breaker, this compound makes possible the initiation and conversion steps of many processes. This structure supports the quality of paint and adhesive dispersions, the effectiveness and shelf life of hair bleaching products, the productivity of oil wells and the yield of synthesis reactions.
Commercially available potassium persulfate products are found in different purities and particle sizes depending on the purification and crystallization processes applied during production. Industrial potassium persulfate is generally produced by reacting an electrolytically obtained ammonium persulfate solution with potassium hydroxide or potassium salts, or by the direct electrolytic oxidation of a potassium bisulfate solution; owing to its low solubility, the product that crystallizes from the solution is centrifuged, dried and screened. This white crystalline solid raw material may vary in terms of process performance and end-product quality depending on technical parameters such as purity, active oxygen, moisture and impurity profile. As a result, Potassium Persulfate is one of the fundamental oxidizing and initiating chemicals of industry, used across a wide spectrum from polymer reactors to hair salons.

COMMON PRODUCT AND CHEMICAL NAMES:

Potassium Persulfate

Potassium Persulphate

Potassium Peroxydisulfate

Potassium Peroxodisulfate

Potassium Peroxodisulphate

Dipotassium Peroxydisulfate

Dipotassium Peroxodisulfate

Peroxydisulfuric Acid Dipotassium Salt

Potasyum Persülfat

Potasyum Peroksidisülfat

Potasyum Peroksodisülfat

Dipotasyum Peroksidisülfat

KPS

K₂S₂O₈

K₂O₈S₂

Potassium Persulfate (INCI)

INS 922 / E922

Potassium Persulfate Technical Grade

Polymer Grade Potassium Persulfate

Cosmetic Grade Potassium Persulfate

Potassium Persulfate ACS Reagent

Some of these names express chemical identification, some an abbreviation, and others the area of use or commercial grade. For example, Potassium Peroxydisulfate and Potassium Peroxodisulfate denote chemical names based on the IUPAC approach, while K₂S₂O₈ is the chemical formula. Potassium Persulphate is the British English spelling; KPS is the abbreviation widely used especially in polymer and laboratory applications. Technical Grade, Polymer Grade, Cosmetic Grade and ACS Reagent are commercial designations referring to the quality class of the product. Potassium Persulfate is also the INCI name used in cosmetic products. The number INS 922 refers to potassium persulfate defined as a flour treatment agent in the Codex Alimentarius system, and it is also referred to as E922 in some sources.
It is important to evaluate the CAS number used for Potassium Persulfate together with the actual identity of the product. CAS No 7727-21-1 and EC No 231-781-8 are listed in sources for potassium persulfate. Ammonium persulfate, sodium persulfate and potassium monopersulfate are separate substances with different CAS numbers. Therefore, during purchasing, it should be verified through documents whether the product is pure potassium persulfate, a different persulfate salt, a potassium monopersulfate-based product or a ready-made blend.

CAS NO, EC / EINECS NO AND CHEMICAL IDENTIFICATION

Product name: Potassium Persulfate / Potasyum Persülfat

Common abbreviation: KPS

Chemical name: Dipotassium peroxydisulfate

INCI name: Potassium Persulfate

Food additive number: INS 922 (E922 in some sources)

CAS No: 7727-21-1

EC / EINECS No: 231-781-8

Molecular formula: K₂S₂O₈

Molecular weight: Approximately 270.3 g/mol

Chemical class: Inorganic peroxide salt / persulfate

Main functions: Radical polymerization initiator, oxidizing agent, hair bleaching component, gel breaker, depolymerization and bleaching agent, organic synthesis reagent

Potassium Persulfate is a product consisting of a single inorganic salt with a defined composition. Therefore, unlike natural mixtures, it is defined by an exact chemical formula and molecular weight; differences between commercial products arise through purity, active oxygen content, moisture, impurity profile and particle size.
CAS No 7727-21-1 and EC No 231-781-8 are listed for potassium persulfate in various official and technical sources. This registration is the general chemical identification describing solid potassium persulfate.
However, using a single CAS number for Potassium Persulfate may not be sufficient for every commercial product. Since persulfate-containing hair bleaching blends, coated (encapsulated) gel breakers and ready-made initiator packages have different chemical definitions and different active ingredient ratios, the full product description and the relevant technical documents should be checked during purchasing.

In measurement and dosage calculations, it should be taken into account that the theoretical active oxygen content of Potassium Persulfate is approximately 5.9% by weight. This value is calculated from the ratio of the active oxygen in the peroxide bridge of the molecule to the molecular weight. In commercial products, the active oxygen content is generally in the range of 5.8–5.9% depending on purity. Since the molecular weight of potassium persulfate is higher than that of ammonium and sodium persulfate, its active oxygen content per unit weight is lower than that of these salts. This ratio is important especially when switching between different persulfate salts and when calculating dosage based on oxidation capacity.
Although Potassium Persulfate is defined as a single main component, trace amounts of iron, copper, lead, chloride, potassium sulfate and moisture may be present in commercial grades. Therefore, even in products with the same CAS number, the impurity profile may change solution stability, polymerization kinetics and performance in certain sensitive applications.

CHEMICAL STRUCTURE AND MOLECULAR PROPERTIES OF POTASSIUM PERSULFATE

Potassium Persulfate is an ionic salt consisting of two potassium cations (K⁺) and one peroxydisulfate anion (S₂O₈²⁻). In the peroxydisulfate anion, two sulfate groups are linked to each other by a peroxide (–O–O–) bridge; this relatively weak O–O bond is the main source of the molecule's strong oxidizing behavior and radical-generating ability.
The structural properties of the molecule and its solution can be summarized as follows: the peroxydisulfate ion is one of the strongest known oxidizers, with a standard reduction potential of around 2.0 V; the O–O bond breaks by heat or by single-electron transfer to form sulfate radical anions (SO₄•⁻); potassium ions give the product lower water solubility and lower hygroscopic character compared with ammonium and sodium salts; since it slowly decomposes in aqueous solution over time to form acidic compounds, the solution pH decreases over time.
Potassium persulfate solutions show different decomposition rates as temperature and pH change. Relatively stable at low temperatures, the solution begins to generate radicals rapidly as the temperature rises. Heavy metal ions, particularly iron and copper, can catalyze decomposition; therefore, low-metal grades are preferred in sensitive applications.

The technical performance of Potassium Peroxodisulfate cannot be understood from its chemical structure alone. Purity, active oxygen, moisture, impurity profile and particle size are important parameters that determine product behavior.
The sulfate radical anion is a highly reactive species with a higher oxidation potential than the peroxydisulfate ion. This radical can add to the double bonds of vinyl monomers to initiate the polymer chain, oxidize organic molecules or oxidatively cleave polysaccharide chains. This property forms the basis of applications such as emulsion polymerization, starch modification, gel breaking and organic synthesis.
Its direct oxidation character, in turn, enables potassium persulfate to selectively oxidize organic substrates such as phenols and aromatic amines; the Elbs persulfate oxidation, known in organic chemistry as the para-hydroxylation of phenols, and the Boyland–Sims oxidation, which provides the ortho-hydroxylation of aromatic amines, are well-known examples of this property. The same oxidizing power is also the main reason it supports the breakdown of melanin pigments in hair bleaching systems.

PHYSICAL AND CHEMICAL PROPERTIES OF POTASSIUM PERSULFATE

Potassium Persulfate is generally a white, odorless solid in crystalline powder or granular form. Its physical appearance may vary depending on the production method, crystallization conditions, particle size and storage conditions.

General technical properties:

Physical appearance: White crystalline powder or granules

Chemical character: Inorganic peroxide salt, strong oxidizer

Molecular formula: K₂S₂O₈

Molecular weight: Approximately 270.3 g/mol

CAS No: 7727-21-1

EC / EINECS No: 231-781-8

Purity (assay): Generally specified as minimum 99%

Active oxygen: Theoretically approximately 5.9%; generally 5.8–5.9% in commercial products

Density: Approximately 2.48 g/cm³ (crystal)

Bulk density: Varies depending on particle size; the current value should be checked from the TDS

Water solubility: Markedly lower than that of ammonium and sodium persulfate; reported to be around 5 g/100 mL at 20 °C, and increases with temperature

Hygroscopic character: Low; the least moisture-absorbing persulfate salt and the most stable in the solid state

pH (aqueous solution): Slightly acidic; the value depends on concentration and the freshness of the solution

Decomposition: Decomposes without melting; significant decomposition begins at around 100 °C

Moisture: Generally specified with a low upper limit

Iron (Fe) content: Limited to low ppm levels depending on grade

Heavy metals (Pb, Cu, etc.): Specified with low limits, especially in polymer, cosmetic and analytical grades

Chloride content: Generally stated with a low upper limit

Reactivity: Strong oxidizer; may react violently with combustible and reducing substances; decomposes with moisture and heat; sulfur oxides and oxygen may be released when heated

The physical properties of Potassium Persulphate may vary depending on the product's particle size and moisture content. Fine crystalline forms dissolve faster, while coarser granular forms generate less dust and show better flow properties. Thanks to its low hygroscopic character, potassium persulfate cakes less than ammonium and sodium persulfate even in humid environments and retains its active oxygen for longer.
Purity and active oxygen are among the most important quality parameters of Potassium Persulfate in terms of technical performance. Active oxygen is generally determined by iodometric or permanganometric titration methods and is a practical indicator for checking whether the product has decomposed during storage.
Iron and heavy metal content is of critical importance, especially in polymer, cosmetic and analytical applications. High metal content can accelerate the decomposition of persulfate, alter polymerization kinetics and lead to color formation in the polymer and deviations in analytical measurements. Therefore, heavy metal limits are widely used to check batch-to-batch quality consistency.
These values are for general technical introduction; they should not be used as the binding specification of the product to be purchased. In particular, parameters such as purity, active oxygen, moisture, pH, iron, heavy metals, chloride, insoluble matter and particle size should be checked against the supplier's current TDS and COA documents.

HOW DOES POTASSIUM PERSULFATE WORK AT THE MOLECULAR LEVEL?

The main effect of Potassium Persulfate in formulations takes place through the dissociation of the peroxydisulfate ion into sulfate radicals by thermal or redox activation, the activation of monomers and organic substrates by these radicals and, under suitable conditions, the direct oxidation of organic molecules and pigments.
In emulsion polymerization, potassium persulfate dissolves in the aqueous phase and decomposes thermally at the reactor temperature, generally in the range of 60–90 °C, forming sulfate radicals. These radicals add to monomer molecules in the aqueous phase to form oligomeric radicals; the oligomers enter micelles or polymer particles and continue chain growth. When used together with reducing agents such as sodium metabisulfite, sodium bisulfite, iron(II) salts or TEMED, a redox initiator system is formed and polymerization can be initiated at much lower temperatures. Since persulfate-derived sulfate end groups impart surface charge to the polymer particles, potassium persulfate is also known as the classic initiator for the synthesis of monodisperse polystyrene latex particles without emulsifiers. This mechanism forms the basis for the use of Potassium Persulfate as an initiator in the polymer industry.
In hair bleaching systems, Potassium Persulfate is used together with hydrogen peroxide in an alkaline medium to accelerate the oxidative breakdown of melanin pigments and helps go beyond the lightening level achievable with hydrogen peroxide alone. Thanks to its low moisture absorption, potassium persulfate generally makes up the largest share of the total persulfate content in bleaching powders.
In the oilfield, temperature-activated persulfate cleaves the polysaccharide chains of crosslinked fracturing gels composed of guar and its derivatives, reducing viscosity and facilitating the recovery of the fluid from the well.
In organic synthesis, potassium persulfate is regarded as a selective oxidant that can hydroxylate phenols and aromatic amines in alkaline media and, together with silver salts, can drive decarboxylative and radical reactions.

The molecular and surface-level functions of Potassium Persulfate may differ depending on the application:

Initiating emulsion and solution polymerization

Acting as the oxidizing component in redox initiator systems

Imparting surface charge to particles in emulsifier-free polymerization

Reducing residual monomer at the end of polymerization (post-treatment)

Enhancing melanin oxidation in hair bleaching products

Breaking polymer gels in fracturing fluids

Reducing the viscosity of starch through oxidative depolymerization

Contributing to desizing and bleaching processes in textiles

Carrying out phenol and aromatic amine oxidations in organic synthesis

Providing sample oxidation and digestion in analytical methods

The radical-generating power and the oxidizing power of Potassium Peroxydisulfate are interconnected. The relative weakness of the peroxide bond makes possible both controlled radical formation and the direct oxidation of organic molecules and pigments.
The polymerization rate and level of oxidation efficiency are directly related to persulfate concentration, temperature, pH, activator type, the presence of metal ions and other additives in the medium. Therefore, Potassium Persulfate should be evaluated not on its own but together with the reducing agents, emulsifiers, buffers, alkaline agents, stabilizers and process parameters with which it is used.
Since persulfate initiators form acidic by-products during decomposition, the pH may drop during polymerization. As this can affect emulsion stability and the hydrolysis of some monomers, buffering agents such as sodium bicarbonate or potassium carbonate are used in many recipes.
However, it should not be assumed that Potassium Persulfate will deliver the same performance in every system. The product grade used, dosage, reactor or formulation chemistry, temperature, solubility limit and other additives should be evaluated through laboratory and field trials.

IN WHICH SECTORS IS POTASSIUM PERSULFATE USED?

Potassium Persulphate is a versatile raw material used in various industrial fields, primarily the polymer and cosmetics sectors, thanks to its radical-generating ability, high oxidizing power and superior stability in the solid state. The purpose of use may vary depending on the product's grade, purity and formulation system.

Main areas of use:

Acrylic, styrene-acrylic and vinyl acetate emulsion polymerization

Styrene-butadiene (SBR), nitrile and chloroprene latex production

Emulsifier-free monodisperse polystyrene latex synthesis

Polyacrylamide and water-soluble polymer production

Polyacrylamide gel preparation in the laboratory (KPS / TEMED system)

Hair bleaching powders and hair lightening boosters

Hydraulic fracturing gel breakers in oil and gas wells

Starch oxidation and paper coating starch preparation

Textile desizing and bleaching processes

Oxidation reagent in organic synthesis (Elbs and Boyland–Sims oxidations)

Metal surface cleaning and micro-etching applications

Analytical chemistry, total organic carbon and sample digestion methods

Cosmetic and personal care formulations (INCI: Potassium Persulfate)

Oxidizing agent and intermediate raw material in chemical synthesis

The most common use of Potassium Persulfate is as an initiator in the production of emulsion polymers used in the paint, adhesive, paper coating and synthetic rubber sectors, and as the main persulfate component of hair bleaching powders in the cosmetics sector. These products are preferred especially in the paint, adhesive, tire, construction chemicals and cosmetics sectors.
Each sector expects different performance from Potassium Persulfate. For example, a polymer manufacturer may prioritize active oxygen consistency, low metal content and an ammonia-free initiator system, while a cosmetics manufacturer may focus on regulatory-compliant documentation, low moisture absorption and long shelf life, an oilfield operator on temperature-dependent activation behavior, and a laboratory user on high purity and reproducibility.

USE OF POTASSIUM PERSULFATE AS A POLYMERIZATION INITIATOR

In polymer formulations, Potassium Persulfate is generally used at low ratios relative to monomer weight, either alone as a thermal initiator or as part of a redox initiator system together with a reducing agent. The persulfate and bisulfite combination is commonly referred to in the industry as a "redox initiator system" or "redox initiator pair".

Possible functions of Potassium Persulfate in polymerization applications are:

Initiating polymerization by forming radicals in the aqueous phase

Increasing the monomer conversion rate

Keeping reaction time and temperature under control

Contributing to dispersion stability by imparting sulfate end groups to the surface of polymer particles

Providing an ammonium-free initiator in systems where ammonia odor and ammonium content are undesirable

Reducing the amount of residual monomer after polymerization

Enabling low-temperature polymerization with redox systems

Contributing to the control of molecular weight and particle size distribution

Potassium persulfate-based initiator programs can be evaluated especially in acrylic and styrene-acrylic paint binders, vinyl acetate-based adhesives, SBR and nitrile rubber latexes, paper coating latexes, carpet and textile binders, construction chemical polymers and model latex synthesis for research purposes.
In polymerization applications, Potassium Persulfate is generally used by dissolving it in water, charging part of it to the reactor at the start and dosing the remainder in parallel with the monomer feed. Since the solubility of potassium persulfate is limited, the initiator solution is prepared more dilute than with ammonium or sodium persulfate; solution concentration, feed rate, reactor temperature and pH are monitored regularly.
As the amount of initiator increases, the polymerization rate generally rises and the polymer molecular weight decreases. Therefore, the initiator ratio should be optimized taking into account the targeted molecular weight, particle size, film properties and residual monomer level.
Potassium persulfate can also be used in laboratory applications as an initiator together with TEMED in the preparation of polyacrylamide gels. In this application, preparing the initiator solution fresh is important for the reproducibility of gelation time and gel quality.
Whether a potassium persulfate product will give the same result in every polymer reactor should not be inferred from the name "Potassium Persulfate" alone. Trials and production monitoring should be carried out based on the monomer composition, emulsifier system, reactor design and process conditions.

OILFIELD, ORGANIC SYNTHESIS, METAL SURFACE TREATMENT AND ANALYTICAL APPLICATIONS OF POTASSIUM PERSULFATE

Potassium Persulfate, in a suitable grade, can be evaluated as a functional component in hydraulic fracturing fluids, organic synthesis reactions, metal surface preparation processes, starch and textile processing and analytical processes.

The functions for which potassium persulfate can be evaluated in these applications may include:

Reducing the viscosity of guar-based gels in fracturing fluids in a temperature-dependent manner

Providing delayed gel breaking in coated (encapsulated) forms

Providing selective hydroxylation of phenols and aromatic amines

Acting as an oxidant in radical-based organic transformations

Removing oxides and organic residues from metal surfaces

Depolymerizing starch in situ in paper mills

Assisting in the removal of starch-based sizes in textiles

Providing sample digestion prior to organic matter and phosphorus/nitrogen determination in water and wastewater analyses

When purchasing Potassium Persulfate for oilfield, organic synthesis, metal treatment and analytical applications, the following should be checked:

Purity and active oxygen content

Moisture content

Iron, copper and other heavy metal content

Chloride, nitrogen and insoluble matter content

Particle size and flow properties

Solution clarity

Current technical specification

Certificate of analysis (COA)

Safety data sheet (SDS)

Manufacturer and batch traceability

Conformity and certification documents, where required

In hydraulic fracturing applications, the effectiveness of potassium persulfate depends largely on the reservoir temperature. At low temperatures it may need to be supported by activators, while at high temperatures coated forms may be preferred to prevent premature gel breaking.
In analytical applications, particularly in persulfate digestion methods for total nitrogen and total phosphorus determination, potassium persulfate is preferred because it contains no ammonium; analytical grades with low nitrogen and phosphorus content should be used in these applications.
Likewise, a potassium persulfate product suitable for polymerization cannot automatically be considered suitable for a sensitive cosmetic, analytical or synthesis application. For each application, the relevant quality requirements and manufacturer documents should be checked.

IS POTASSIUM PERSULFATE USED IN COSMETIC, FOOD AND PHARMACEUTICAL APPLICATIONS?

Potassium persulfate is an ingredient used in cosmetic and personal care products under the INCI name Potassium Persulfate in grades with suitable purity and documentation. In CosIng, the European Commission's cosmetic ingredient database, Potassium Persulfate is listed with an oxidizing function. Therefore, potassium persulfate may be included especially in hair bleaching powders, hair lightening boosters and some hair coloring systems.
In hair bleaching products, Potassium Persulfate is generally the largest persulfate component of the powder formulation and is often used together with ammonium persulfate and sodium persulfate; at the time of use, it is mixed with a developer containing hydrogen peroxide. This combination accelerates the oxidation of melanin pigments in an alkaline medium and helps achieve higher lightening levels. The low moisture absorption tendency of potassium persulfate helps the bleaching powder remain stable throughout its shelf life without caking and without losing its lightening power.
Persulfates are known as substances that can cause respiratory and skin sensitization and have been associated with allergic reactions and occupational asthma, especially in professionals who frequently work with hair bleaching products. Therefore, if Potassium Persulfate is to be used in cosmetic formulations, dust-reducing forms, appropriate warning statements, instructions for use and a safety assessment should be taken into account; the permitted conditions of use and labeling requirements should be checked against current cosmetics regulations.
However, industrial Potassium Persulfate produced for polymer or technical purposes should not be used directly as a raw material in cosmetic, personal care, food or pharmaceutical products. Industrial grades are not designed to meet the heavy metal limits, impurity profile and documentation required for these fields. For cosmetic applications, cosmetic grade, the relevant documents and heavy metal analyses should be requested.
In the food field, potassium persulfate is defined in the Codex Alimentarius INS system under number 922 as a flour treatment agent and is also referred to as E922 in some sources. However, it is not included in the European Union's list of approved food additives; therefore, its use as a food additive is not applicable in the EU and in countries whose legislation is harmonized with the EU. Before any food-related use, the current food legislation of the target market must be checked.
In pharmaceutical applications, Potassium Persulfate is evaluated not as an active substance or excipient, but rather as a laboratory reagent and synthesis intermediate chemical. In these fields, only grades that meet the relevant quality requirements and are documented accordingly should be used.
If polymers produced with potassium persulfate are planned to be used in applications with possible indirect food contact, such as food packaging, food-contact polymers or paper coatings, the compliance of the final material with the relevant food contact legislation should be evaluated separately.

INDUSTRIAL APPLICATIONS OF POTASSIUM PERSULFATE

Potassium Persulfate is an important functional raw material used in many industrial systems due to its radical-generating power, high oxidation potential, superior storage stability in the solid state and low hygroscopic character.

The following functions may stand out in industrial potassium persulfate applications:

Radical polymerization initiation

Redox initiator systems

Ammonium-free initiator solutions

Hair lightening and bleaching

Polymer gel breaking

Starch depolymerization

Textile desizing and bleaching

Selective oxidation in organic synthesis

Metal surface preparation

Analytical oxidation and sample digestion

In the polymer sector, Potassium Persulfate is one of the key chemicals of the initiator systems that enable the production of water-based dispersions used as paints, adhesives, paper coatings, synthetic rubber, textile binders and construction chemicals. For this reason, it is among the critical raw materials for facilities producing emulsion polymers and latexes.
In the cosmetics sector, potassium persulfate is one of the main raw materials that determine the performance and shelf life of the formulation for hair bleaching powder manufacturers. In powder formulations, moisture control, particle size and dust formation are priority quality parameters for this sector.
In oilfield, paper, textile, organic synthesis and laboratory applications, Potassium Persulphate can be evaluated for different functions such as gel breaking, viscosity control, desizing, selective oxidation and analytical digestion.

The following issues should be evaluated when using Potassium Persulfate in industrial systems:

Product grade and purity

Active oxygen content

Heavy metal and iron impurities

Moisture and particle size

A solution preparation method suited to its limited solubility, and the shelf life of the solution

Target persulfate concentration

Process temperature and activation method

Material compatibility (tank, piping and pump materials)

Compatibility with reducing agents, organics and other process chemicals

Dust control and exposure measures

Wastewater and discharge limits

WHICH PROBLEMS CAN POTASSIUM PERSULFATE HELP SOLVE?

Potassium Persulfate can help solve various problems associated with low conversion, residual monomer, loss of performance over shelf life, insufficient lightening power, unbroken gels and high viscosity in polymer, cosmetic, oilfield, organic synthesis and chemical process systems. However, its effect depends on the product grade used, dosage and system conditions.

Low conversion and high residual monomer in emulsion polymerization

Insufficient or unstable initiator systems can lead to slow polymerization, low conversion, and residual monomer and odor problems in the final product. Potassium persulfate, used at the correct ratio and with the correct feed profile, can help polymerization proceed in a controlled and complete manner.
However, simply increasing the amount of initiator does not solve the problem under all conditions. The emulsifier system, monomer feed rate, reactor temperature and oxygen control should be evaluated together.

Ammonia odor in polymer and latex products

In some systems initiated with ammonium persulfate, ammonia odor or undesirable ammonium-related effects may be observed in the final product. Ammonium-free potassium persulfate can be evaluated as the initiator in such systems to help reduce odor and ammonium content.

Caking and loss of lightening power over shelf life in hair bleaching powders

Bleaching powders in which moisture-absorbing persulfate salts are used at high levels may cake during storage and lose active oxygen, thereby losing their lightening power. Thanks to its low hygroscopic character, using potassium persulfate as the main persulfate component in the formulation can help the product remain stable throughout its shelf life.
However, it is not sufficient on its own; the alkaline agent, dust binder, moisture barrier of the packaging, developer concentration, application time and user safety should be evaluated together.

Unbroken gel residues in hydraulic fracturing

Unbroken gel residues after the fracturing operation can reduce fracture conductivity and thus decrease well productivity. Temperature-activated potassium persulfate can contribute to the timely reduction of gel viscosity by cleaving polymer chains.
However, the reservoir temperature, pH and desired break time should be taken into account, and it should be used with coated forms or activators where necessary.

High viscosity in starch processing

Native starch may have too high a viscosity for paper coating and surface sizing applications. Oxidative depolymerization with potassium persulfate can help reduce starch viscosity to the desired level.

Nitrogen-related deviations in analytical digestion

In analyses such as total nitrogen determination, the use of ammonium-containing oxidants can affect the measurement result. Potassium persulfate of suitable purity can help achieve oxidation in sample digestion without contributing nitrogen.
It should not be assumed that every Potassium Persulfate product will show the same process and performance behavior; the usage rate should be verified through laboratory and field trials.

POINTS TO CONSIDER WHEN USING POTASSIUM PERSULFATE

One of the most common mistakes in the use of Potassium Persulfate is using different persulfate salts interchangeably at the same weight. However, the molecular weights of potassium, ammonium and sodium persulfate, and therefore their active oxygen contents per unit weight, are different; potassium persulfate has the lowest active oxygen content per unit weight among these salts, and dosage calculations should be made on a molar or active oxygen equivalent basis. Another common mistake is confusing potassium persulfate with the similarly named potassium monopersulfate.

The following issues should be taken into account when using Potassium Persulfate:

A potassium persulfate grade suitable for the intended use should be selected.

It should be verified that the product is potassium peroxydisulfate and not potassium monopersulfate.

Active oxygen or molar equivalent should be used as the basis for dosage calculations.

Purity, moisture and impurity values should be checked.

Solution concentration should be determined taking the limited solubility into account, and the risk of crystallization in cold environments should be considered.

Persulfate solutions should be prepared as fresh as possible and should not be kept for long periods.

Solution preparation should be carried out with clean and compatible equipment, by adding the product to water.

The product should not be mixed with reducing agents, organic substances and combustible materials.

The compatibility of tank, piping, pump and gasket materials should be evaluated.

Process temperature and activation method should be determined and kept under control.

pH drop should be monitored during polymerization and buffering should be applied if necessary.

Dust formation and respiratory exposure should be minimized.

Dosage and formulation should be determined through laboratory and field trials.

Wastewater and discharge requirements should be evaluated.

Manufacturer TDS and SDS documents should be reviewed.

Batch-based analysis results should be verified via the COA.

Potassium Persulfate is an oxidizing solid that may intensify fire and may cause respiratory and skin sensitization. To prevent dust formation during weighing, transfer, dissolution and dosing, appropriate respiratory protection, chemical-resistant gloves, tight-fitting goggles, appropriate work clothing and adequate ventilation or local exhaust should be used. Safe working procedures should be determined according to the current SDS of the product.
Exposure to the auxiliary raw materials used together in processes, such as sodium metabisulfite, hydrogen peroxide, alkaline agents, sodium metasilicate and monomers, as well as the heat and gas emissions that may occur during the reaction, should also be evaluated separately.

STARTING FORMULATION APPROACHES FOR POTASSIUM PERSULFATE

The examples below are starting approaches prepared to show how Potassium Persulfate can be evaluated in the formulation and process development process. They are not validated commercial recipes, production instructions or regulatory-compliant final formulas.
The ratios given are example starting levels for preliminary laboratory trials. The purity and active oxygen content of the potassium persulfate to be used, as well as the other raw materials, can significantly change performance. In every application, laboratory trials, performance tests, occupational safety and relevant regulatory checks should be carried out.

EXAMPLE 1: POTASSIUM PERSULFATE INITIATOR LEVEL SCREENING IN STYRENE-ACRYLIC EMULSION POLYMERIZATION

Objective: To determine the effect of the amount of potassium persulfate on monomer conversion, residual monomer, particle size and viscosity in styrene-acrylic or acrylic emulsion polymerization.

Starting components:

Potassium Persulfate: approximately 0.15%, 0.25%, 0.40% and 0.60% based on total monomer weight

Monomer mixture (e.g. styrene / butyl acrylate / acrylic acid): kept constant

Emulsifier system: kept constant

Buffering agent (e.g. sodium bicarbonate): kept constant

Reactor temperature: approximately 75–85 °C, kept constant

Feed time and stirring speed: kept constant

The amount of potassium persulfate is increased gradually and the changes in polymer properties are compared. If a comparison with ammonium persulfate is to be made, the two initiators should be used not at the same weight but on a molar equivalent basis.

Application approach:

Demineralized water, part of the emulsifier and the buffering agent are charged to the reactor and heated to the target temperature under nitrogen.
Potassium persulfate is freshly dissolved in a sufficient amount of warm demineralized water, taking its solubility limit into account.
Part of the initiator solution is added to the reactor and, shortly afterwards, feeding of the monomer pre-emulsion is started.
The remaining initiator solution is dosed in parallel with the monomer feed.
After the feed is completed, the reaction is maintained at the same temperature for a certain period and then cooled.
Solids content, conversion, residual monomer, particle size, viscosity, pH and the amount of coagulum are measured.
The initiator ratio giving the most balanced result is determined.
Uncontrolled contact of potassium persulfate with reducing agents and organic materials should be avoided, and appropriate respiratory, eye and hand protection should be used during the work.

EXAMPLE 2: POTASSIUM PERSULFATE GEL BREAKING PRELIMINARY TRIAL FOR A GUAR-BASED FRACTURING GEL

Objective: To examine the effect of potassium persulfate concentration and temperature on the rate of viscosity reduction of a guar-based linear gel.

Starting approach:

Guar or guar derivative: approximately 0.4–0.5% (linear gel), kept constant

Potassium Persulfate: approximately 0.1, 0.25, 0.5 and 1.0 g/L

pH adjuster / buffer: kept constant

Test temperature: approximately 50, 65 and 80 °C

Measurement intervals: kept constant at defined time points

These concentrations provide a starting point for gel breaker evaluations. Concentration, activator and form (free or coated) should be adjusted according to the targeted break time, reservoir temperature and crosslinker system.

Application approach:

Guar is added slowly to water under stirring and mixed until fully hydrated.
The pH is adjusted and the initial viscosity is measured.
Potassium persulfate is freshly dissolved in a small amount of water in a separate container.
The persulfate solution is added to the gel and homogenized.
The samples are placed in a water bath or heated viscometer at the target temperature.
Viscosity is measured at the defined time points and viscosity–time curves are plotted.
Break times at different concentrations and temperatures are compared.
Residue formation in the broken gel is evaluated visually and, if necessary, by filtration.
Appropriate eye, face and hand protection should be used when working with persulfate, and used samples should be disposed of in accordance with regulations.

EXAMPLE 3: POTASSIUM PERSULFATE RATIO EVALUATION IN A HAIR BLEACHING POWDER FORMULATION

Objective: To examine the effect of the potassium persulfate ratio in a hair bleaching powder formulation on lightening power, mix consistency, powder stability and application time.

Starting approach:

Potassium Persulfate: approximately 35%, 40% and 45%

Ammonium persulfate and/or sodium persulfate: approximately 5–15% (keeping the total persulfate ratio constant)

Sodium metasilicate or a similar alkaline agent: approximately 10–15%

Thickener (e.g. cellulose derivative): approximately 2–3%

Dust binder (e.g. mineral oil or suitable oils): approximately 3–5%

Filler (e.g. silica or magnesium carbonate): balance

Cosmetic grade raw materials should be used, and the powder should be evaluated by mixing it at the time of use with a developer containing hydrogen peroxide at the ratio recommended by the supplier.

Application approach:

The powder components are homogenized in a dry and clean mixer.
The dust-binding oil is added slowly under mixing to reduce dust formation.
The homogeneity, flowability and dust formation of the mixture are evaluated.
Some of the samples are stored under accelerated stability conditions, and caking and active oxygen loss are monitored.
The powder is mixed with the developer, and mix consistency and temperature rise are checked.
Application is carried out on standard hair swatches for defined periods and the lightening level is measured.
Results are compared across different potassium persulfate ratios.
The regulatory compliance, safety assessment, labeling and warning statements of the final product are checked separately.
Since persulfates can cause respiratory and skin sensitization, dust control, appropriate respiratory and hand protection and ventilation must be ensured in such evaluations.

SIMILAR PRODUCTS AND ALTERNATIVES TO POTASSIUM PERSULFATE

An alternative to Potassium Persulfate is not merely a matter of choosing another persulfate salt. When determining an alternative, the target process, active oxygen content, solubility, hygroscopic character, decomposition temperature, cation type, occupational safety requirements, regulations and final product performance should be evaluated together.

POTASSIUM PERSULFATE AND AMMONIUM PERSULFATE

Ammonium persulfate (CAS No 7727-54-0) is one of the most common persulfate salts, containing the same peroxydisulfate anion and used in similar applications. Therefore, the comparison between potassium persulfate and ammonium persulfate is an evaluation between salts formed by the same active anion with two different cations.
Ammonium persulfate has much higher water solubility and a higher active oxygen content per unit weight; for this reason, it is preferred in concentrated initiator and etching solutions. Potassium persulfate, on the other hand, can offer advantages in powder formulations and in polymer systems where ammonia odor is undesirable, thanks to being ammonium-free, its lower tendency to absorb moisture and its higher storage stability.
When switching between the two products, dosage should be calculated on a molar or active oxygen equivalent basis.

POTASSIUM PERSULFATE AND SODIUM PERSULFATE

Sodium persulfate (CAS No 7775-27-1) is another persulfate salt with high water solubility that contains no ammonium.
Its high solubility makes sodium persulfate stand out in environmental remediation, PCB etching and processes requiring concentrated solutions. Potassium persulfate, by contrast, can become advantageous in solid formulations and long-term storage thanks to its lower solubility and lower hygroscopic character.
Therefore, the choice should be made taking into account the need for solution concentration, storage conditions and formulation type.

POTASSIUM PERSULFATE AND POTASSIUM MONOPERSULFATE

Potassium monopersulfate (potassium peroxymonosulfate) is an oxidizer that, despite its similar name, is different from potassium persulfate and is commercially supplied as a triple salt mixture containing KHSO₅.
Potassium monopersulfate is used especially in pool shock oxidation, surface disinfection, denture cleansers and some organic synthesis applications, whereas potassium persulfate is evaluated mainly as a polymerization initiator and hair bleaching component.
Since these two products have different CAS numbers, different active oxygen contents and different reactivity profiles, they should not be used interchangeably, and the product identity must be verified when ordering.

POTASSIUM PERSULFATE AND HYDROGEN PEROXIDE

Hydrogen peroxide is another common oxidizer used in bleaching, polymerization, environmental and cosmetic applications.
Since hydrogen peroxide leaves only water and oxygen when it decomposes, it can offer advantages in terms of waste; however, as a liquid, its transport and storage require different safety measures, and in some reactions it may not be as selective or effective as persulfate. In hair bleaching systems, the two oxidizers are generally not alternatives to each other but components that work together.
Therefore, the use of hydrogen peroxide instead of potassium persulfate should be evaluated taking into account the process chemistry and target performance.

POTASSIUM PERSULFATE AND ORGANIC PEROXIDE AND AZO INITIATORS

Organic peroxides and azo initiators such as AIBN are radical initiators that can be used as alternatives to potassium persulfate, especially in solution, suspension and bulk polymerization.
While a significant portion of these initiators dissolve in the monomer or in organic solvents, potassium persulfate is water-soluble and is therefore preferred particularly in emulsion and aqueous solution polymerization. Water-soluble azo initiators, on the other hand, can be evaluated in some special applications because they do not form sulfate end groups.
Therefore, initiator selection should be based on polymerization type, reaction temperature, the need for polymer end groups and product purity.

POTASSIUM PERSULFATE AND OTHER OXIDIZERS USED IN COSMETICS

In hair bleaching and coloring products, different oxidizing ingredients such as Ammonium Persulfate, Sodium Persulfate, Hydrogen Peroxide and Sodium Percarbonate are also used in addition to Potassium Persulfate.
These compounds may differ in terms of lightening power, solubility, dust formation, skin compatibility and stability. For example, potassium persulfate provides a stability advantage in powder formulations thanks to its low solubility and low moisture absorption tendency, while ammonium persulfate may act faster.
In selecting an alternative, the targeted performance, formulation compatibility, regulatory limits and cost should be determined through comparative laboratory and field tests.

QUALITY CONTROL AND PURCHASING CRITERIA FOR POTASSIUM PERSULFATE

When purchasing Potassium Persulfate, deciding based only on the product name and price is not sufficient. In particular, different quality classes such as technical, polymer, cosmetic and analytical, as well as products from different manufacturers, may have different technical properties.

Information recommended to be reviewed before purchasing:

Product name and manufacturer

Product form (crystalline powder, granules or special particle size)

Whether it is pure potassium persulfate or a blend

Confirmation that it has not been confused with potassium monopersulfate

CAS number

EC / EINECS number

Purity (assay)

Active oxygen content

Moisture content

pH (in a solution of specified concentration)

Iron (Fe) content

Copper, lead and other heavy metals

Chloride content

Nitrogen and phosphorus content for analytical uses

Insoluble matter and solution clarity

Particle size distribution

Quality class (technical, polymer, cosmetic, analytical)

INCI name and relevant documents for cosmetic applications

Technical data sheet (TDS)

Safety data sheet (SDS)

Certificate of analysis (COA)

Production and batch information

Origin information

Packaging type and net quantity

Storage conditions

Shelf life or retest information

REACH and related regulatory compliance information

The COA shows the analysis results of a specific batch of Potassium Persulfate. The TDS describes the general technical properties of the product and its recommended areas of use. The SDS contains information on safe use, transport, storage and emergencies.
These documents do not replace one another; they should be evaluated together.
In particular, when purchasing potassium persulfate, the supplier should be asked about the product's purity, active oxygen content, moisture, iron and heavy metal content and quality class. This is because products with different purities and particle sizes may be found under the same Potassium Persulfate name.

STORAGE AND TRANSPORTATION OF POTASSIUM PERSULFATE

Potassium Persulfate should be stored under the conditions recommended by the manufacturer, in a cool, dry and well-ventilated area, away from direct sunlight and heat sources, in its tightly closed original packaging.
Although potassium persulfate is the least moisture-absorbing persulfate salt and the most stable in the solid state, it may decompose over time in humid and hot environments and lose active oxygen; since heat and gas may be released during decomposition, it is important to protect the packages from moisture and high temperatures. Packaging with polyethylene inner bags and suitable plastic containers should be preferred.
Potassium persulfate should be stored separately from reducing agents, organic substances, combustible materials, metal powders, strong bases, cyanides and sulfur compounds. Spilled product should not be allowed to come into contact with combustible materials such as wooden pallets, paper and textiles.
After the package is opened, it is important to protect the product from contamination. Clean, dry and compatible equipment should be used during use, unused product should not be returned to the package, and the package should be properly resealed.
In international transport, potassium persulfate is generally classified under UN 1492, Class 5.1 (oxidizing substance). The current transport classification and packing group should be checked from the supplier's SDS.
In the event of a spill, the product should be collected without generating dust using non-combustible material, placed in clean and dry containers, prevented from reaching drains and surface waters, and the cleanup procedures specified in the SDS should be followed. Spills should not be collected with sawdust, paper or other combustible absorbents.
Products that have been stored for a long time, have caked or have changed in appearance should be evaluated in accordance with the manufacturer's specifications by performing an active oxygen analysis before use.

SAFETY INFORMATION FOR POTASSIUM PERSULFATE

The safe use of Potassium Persulfate depends on the current SDS of the supplied product and the implementation of appropriate occupational safety measures.
Potassium persulfate is an oxidizing solid that may intensify fire; it may be harmful if swallowed, may cause skin and eye irritation, may cause respiratory irritation and may cause both skin and respiratory sensitization. Supplier SDSs may include classifications such as oxidizing solid, acute oral toxicity, skin irritation, eye irritation, respiratory sensitizer, skin sensitizer and specific target organ toxicity (respiratory tract irritation). Current hazard and precautionary statements should be checked from the supplier's SDS.
Potassium persulfate is a substance registered under the European Union REACH Regulation. Wastewater containing persulfate is subject to regulation in many countries. The applicable obligations and current regulatory status for companies using the product and placing it on the market should be followed through the relevant official sources.
In particular, inhalation of dust and contact with skin and eyes should be avoided. During weighing, transfer, dissolution and dosing operations, appropriate respiratory protection, chemical-resistant protective gloves, tight-fitting eye protection, appropriate work clothing and adequate ventilation should be used. Local exhaust should be provided in areas where dust is generated. It is recommended that persons who have developed sensitivity to persulfates do not work with this substance.
Contaminated clothing should be removed immediately and washed before reuse; in case of skin or eye contact, the area should be rinsed with plenty of water; medical attention should be sought if respiratory symptoms, asthma-like complaints or skin reactions occur. It is recommended to have an eyewash station and emergency shower in the work area.
In the event of fire, since the product may intensify combustion by releasing oxygen, extinguishing with plenty of water is generally preferred; smothering-type extinguishers may have limited effectiveness. Hazardous gases such as sulfur oxides may be formed during a fire. The appropriate extinguishing method should be checked from the SDS.
Uncontrolled release of the product and of wastewater containing potassium persulfate into drains, soil or surface waters should be prevented. Waste disposal should be carried out in accordance with local regulations and the methods specified in the SDS.
It should not be assumed that the safety information for products from different manufacturers or of different grades is the same. The current SDS and the manufacturer's technical documentation should be taken as the basis.

WHAT SHOULD BE CONSIDERED WHEN PURCHASING POTASSIUM PERSULFATE?

The first step in Potassium Persulfate procurement is to clarify for what purpose and in which system the product will be used. The quality criteria sought for emulsion polymerization, hair bleaching products, oilfield, starch processing, organic synthesis or analytical applications may not be the same.
Therefore, rather than writing only "Potassium Persulfate" or "Potasyum Persülfat" in the purchase request, specifying the area of use, the required purity, the quality class and the targeted technical performance enables a more accurate product evaluation.

The following information should be clarified before purchasing:

Sector of use and final application

That the product is potassium persulfate (peroxydisulfate), not monopersulfate

Required product form and particle size

Required minimum purity

Required minimum active oxygen content

Moisture limit

Iron and heavy metal limits

Chloride and insoluble matter requirements

Required quality class and standard

INCI and regulatory documents for cosmetic applications

Manufacturer and origin information requirements

Required packaging type and quantity (bag, big bag, drum)

TDS, SDS and COA requirements

REACH and other regulatory compliance documents

Technical properties of the current product, if a substitution is to be made

The price of Potassium Persulfate may vary depending on purity, quality class, particle size, origin, potassium raw materials, ammonium persulfate and energy costs, order quantity, packaging, dangerous goods logistics and current market conditions. Therefore, the current potassium persulfate price should be evaluated through a quotation together with the product specification and delivery terms.

POTASSIUM PERSULFATE SUPPLY FROM ATAMAN KİMYA

Potassium Persulfate is an important persulfate chemical evaluated for different technical functions such as polymerization initiation, hair lightening, gel breaking, bleaching and oxidation in polymer, cosmetic, oilfield, paper, textile, organic synthesis and laboratory applications. It is important for manufacturers planning to purchase the product to clarify the grade suitable for their area of use, the technical specifications and the required documents before ordering.
Companies wishing to obtain information about Potassium Persulfate supply from Ataman Kimya can request information on product suitability, current supply status, packaging options and a price quotation by sharing their areas of use and technical requirements.
The current stock status, origin, quality class, technical properties, packaging and specifications of the product should be confirmed with Ataman Kimya before ordering.

Sharing the following information in the quotation request makes it easier to evaluate the right Potassium Persulfate product:

Sector of use and final application

Requested product form and particle size

Requested minimum purity and active oxygen content

Iron and heavy metal limits

Formulation or process information used

Requested quality standard

Estimated order quantity

Requested packaging type

Requested technical documents

TDS or COA information of the current product, if any

FREQUENTLY ASKED QUESTIONS ABOUT POTASSIUM PERSULFATE

What is Potassium Persulfate?
Potassium Persulfate is a strong oxidizing salt with the formula K₂S₂O₈, a white crystalline structure and non-hygroscopic character. It is also called Potasyum Persülfat, Potassium Peroxydisulfate or KPS, and is used particularly as a polymerization initiator and as an oxidizer in hair bleaching products.

What does "potasyum persülfat" mean?
Potasyum persülfat (potassium persulfate) is the dipotassium salt of peroxydisulfuric acid. In English, it is referred to as Potassium Persulfate, Potassium Peroxydisulfate or Potassium Peroxodisulfate.

What is the CAS number of Potassium Persulfate?
The CAS number for potassium persulfate is 7727-21-1.

What is the EC / EINECS number of Potassium Persulfate?
The EC / EINECS number for potassium persulfate is listed as 231-781-8.

What is the chemical formula of potassium persulfate?
The chemical formula of potassium persulfate is K₂S₂O₈, and its molecular weight is approximately 270.3 g/mol.

How much active oxygen does Potassium Persulfate contain?
The theoretical active oxygen content of potassium persulfate is approximately 5.9% by weight. In commercial products, this value is generally in the range of 5.8–5.9% depending on purity. The exact value should be checked from the supplier's COA.

What is the INCI name of Potassium Persulfate?
The INCI name of potassium persulfate used in cosmetic products is Potassium Persulfate.

Is Potassium Persulfate used in cosmetics?
Yes. Cosmetic grades of suitable purity can be used under the INCI name Potassium Persulfate, especially in hair bleaching powders and hair lightening boosters. Due to the sensitization potential of persulfates, the conditions of use, warning statements and labeling requirements should be checked against current cosmetics regulations. Industrial grade products should not be used in cosmetics.

Why is potassium persulfate the most widely used persulfate in hair bleaching powders?
Potassium persulfate is the least moisture-absorbing persulfate salt and the most stable in the solid state. This property helps the bleaching powder avoid caking during storage and retain its lightening power throughout its shelf life.

Does Potassium Persulfate have an E number?
Potassium persulfate is defined in the Codex Alimentarius INS system under number 922 as a flour treatment agent and is referred to as E922 in some sources. However, it is not included in the European Union's list of approved food additives. For food-related uses, the current legislation of the target market should be checked.

What is the difference between potassium persulfate and ammonium persulfate?
Both products contain the same peroxydisulfate anion; the difference lies in the type of cation. Ammonium persulfate is much more soluble in water and contains more active oxygen per unit weight; potassium persulfate, on the other hand, contains no ammonium, absorbs less moisture and is more stable in the solid state.

Are potassium persulfate and potassium monopersulfate the same product?
No. Potassium persulfate (K₂S₂O₈) is a peroxydisulfate salt; potassium monopersulfate is a KHSO₅-based triple salt mixture used especially in pool shock oxidation and disinfection products. The two products have different CAS numbers and different areas of use.

What is Potassium Persulfate used for?
Potassium Persulfate is used as an initiator in emulsion polymerization, as an oxidizer in hair bleaching products, as a gel breaker in hydraulic fracturing, as an oxidation reagent in organic synthesis and as an oxidizer in starch, textile and laboratory applications.

In which sectors is Potassium Persulfate used?
Potassium persulfate can be used in the polymer, paint, adhesive, synthetic rubber, cosmetics, oil and gas, paper, textile, fine chemicals and laboratory sectors.

How does potassium persulfate initiate polymerization?
When heated or when it encounters a reducing agent, potassium persulfate decomposes into sulfate radical anions. These radicals add to the double bonds of monomers and initiate the polymer chain.

What do KPS and TEMED do?
When preparing polyacrylamide gels in the laboratory, potassium persulfate (KPS) can be used as the radical source and TEMED as the activator that accelerates this radical formation. This redox system enables acrylamide to polymerize at room temperature and form a gel.

Is Potassium Persulfate soluble in water?
Yes, but its solubility is markedly lower than that of ammonium and sodium persulfate; it is around 5 g/100 mL at 20 °C and increases with temperature. Its aqueous solution decomposes over time, losing active oxygen, and its pH decreases; therefore, it is recommended that solutions be prepared fresh.

How much Potassium Persulfate is used in polymerization?
The amount used varies according to monomer type, process and target polymer properties. In emulsion polymerization, it is generally evaluated at low ratios based on total monomer weight, mostly in the range of 0.1–0.6%. The correct dosage should be determined through laboratory and production trials.

Is Potassium Persulfate a hazardous substance?
Potassium persulfate is an oxidizing solid that may intensify fire; it may be harmful if swallowed, may irritate the skin, eyes and respiratory tract, and may cause respiratory and skin sensitization. Therefore, appropriate protective equipment should be used and the current SDS should be taken as the basis.

Why can potassium persulfate cause allergies?
Persulfates are sensitizing substances that can cause the immune system to become hypersensitive upon repeated exposure. Inhalation of powdered products in particular has been associated with occupational asthma and skin reactions; therefore, dust control and personal protection are important.

Is Potassium Persulfate registered under REACH?
Potassium persulfate is a substance registered under REACH. The current regulatory status and related obligations should be followed through official sources.

What is the physical appearance of Potassium Persulfate?
Potassium Persulfate is generally a white, odorless solid in crystalline powder or granular form.

What is the UN number of Potassium Persulfate?
In transport, potassium persulfate is generally classified under UN 1492, Class 5.1 (oxidizing substance). The current classification should be checked from the supplier's SDS.

Why are iron and heavy metal content important in potassium persulfate?
Iron and heavy metal impurities can accelerate the decomposition of persulfate, affect polymerization kinetics and polymer color, and cause quality and accuracy problems in cosmetic and analytical applications. Current values should be checked from the supplier's TDS and COA documents.

What does the price of Potassium Persulfate depend on?
The price of potassium persulfate may vary depending on purity, quality class, particle size, origin, raw material and energy costs, packaging, order quantity, dangerous goods logistics and market conditions.

Are there alternatives to Potassium Persulfate?
Ammonium persulfate, sodium persulfate, hydrogen peroxide, organic peroxides and azo initiators can be evaluated as alternatives in certain applications. However, the choice of alternative should be made according to the targeted performance and system.

How should Potassium Persulfate be stored?
Potassium persulfate should be stored in a cool, dry and well-ventilated area, in its tightly closed original packaging, away from heat sources, moisture, reducing agents, organic and combustible materials, metal powders and strong bases.

Which documents should be requested when purchasing Potassium Persulfate?
TDS, SDS and COA are the basic documents. In addition, origin information, REACH and related regulatory compliance information and, for cosmetic applications, the relevant quality and regulatory documents may be requested.

Which technical specifications are important when purchasing Potassium Persulfate?
Purity, active oxygen content, moisture, pH, iron and heavy metal content, chloride, insoluble matter, particle size and quality class may be important depending on the intended use.

POTASSIUM PERSULFATE – TECHNICAL SUMMARY

Potassium Persulfate, known in Turkish as Potasyum Persülfat, is an inorganic peroxide salt with the formula K₂S₂O₈ that has a white crystalline structure, is non-hygroscopic and has a strong oxidizing character. It may be searched under different names such as Potassium Peroxydisulfate, Potassium Peroxodisulfate, Dipotassium Peroxydisulfate, Potassium Persulphate and KPS; it is used under the INCI name Potassium Persulfate in cosmetic products and is identified in the Codex Alimentarius system by the number INS 922 (E922 in some sources).
Potassium Persulfate is not a single commercial product type. Although technical, polymer, cosmetic and analytical grades are based on the same chemical structure, their impurity limits, documentation and areas of use differ. Purity, active oxygen content, moisture, and iron and heavy metal content are also important parameters affecting performance.
CAS No 7727-21-1 and EC No 231-781-8 are used for potassium persulfate. Since the term "persulfate" can evoke different products such as ammonium persulfate, sodium persulfate, potassium monopersulfate and ready-made persulfate-containing blends, the full product identity and quality class should be checked during purchasing.
Potassium Persulfate is mainly used in emulsion and solution polymerization, hair bleaching products, hydraulic fracturing gel breakers, starch and textile processing, organic synthesis and laboratory applications. It contributes to process efficiency and product quality through functions such as radical generation, polymerization initiation, hair lightening, oxidative degradation and bleaching; its low moisture absorption tendency and high storage stability make it stand out in powder formulations. Performance depends on product grade, dosage, process chemistry, activation method, other additives and system conditions.
During the processing of Potassium Persulfate, which may intensify fire, may be harmful if swallowed, may irritate the skin, eyes and respiratory tract and may cause sensitization, appropriate occupational safety measures must be taken and the current SDS must be taken as the basis. Selecting the right grade of Potassium Persulfate, which can be evaluated in polymer, cosmetic, oilfield, organic synthesis and laboratory applications, is important for final product performance.
Companies planning to source Potassium Persulfate from Ataman Kimya are advised to confirm current product, stock, origin, packaging and quotation information by sharing their area of use, requested product form and quality class, minimum purity and active oxygen content, impurity limits, quality standard, quantity and technical documentation needs.