DIPROPYLENE GLYCOL DPG

Dipropylene Glycol DPG is a water-miscible glycol with CAS 25265-71-8 and formula C6H14O3, used as a solvent, fragrance carrier, humectant and reactive industrial intermediate. Formulators select it for its low volatility, coupling ability and availability in grades with tightly controlled odor. Its hydroxyl and ether groups interact with water and compatible organic ingredients, while the hydroxyl groups can also participate in resin-forming reactions.

CAS No: 25265-71-8
EC No: 246-770-3
Molecular formula: C6H14O3
Molecular weight: approximately 134.17 g/mol
Appearance: clear, colorless liquid
Odor: grade-dependent, very low in fragrance grades
Water miscibility: complete
Density at 25°C: approximately 1.022 g/cm³ in a representative grade
Dynamic viscosity at 25°C: approximately 75 mPa·s in that grade
Distillation range at 101.3 kPa: approximately 228-236°C in that grade

WHAT IS DIPROPYLENE GLYCOL DPG?

Dipropylene Glycol DPG is a low-volatility, hygroscopic diol used in fragrance compounding, personal care, cleaning formulations and resin manufacture. Commercial DPG, CAS 25265-71-8, contains related structural isomers with the same molecular formula and molecular weight.

Its role changes with the application. In a fragrance intermediate, it mainly serves as a solvent or carrier. In an aqueous cosmetic it can contribute humectancy and cosolvency, while in a polyester or polyurethane system its hydroxyl groups make it a reactive raw material.

Industrial manufacture can recover DPG as a coproduct of propylene glycol production by hydrolysis of propylene oxide. Separation and distillation provide the commercial glycol fraction. Further control of odor and consistency distinguishes grades intended for sensory-sensitive products.

Industrial and fragrance grades are not interchangeable merely because their major physical properties are similar. Odor acceptance, trace impurities and consistency matter in perfumes, whereas resin manufacture may prioritize moisture and reaction quality. A batch's assay alone does not demonstrate a fragrance-grade odor profile.

Propylene glycol, tripropylene glycol, polypropylene glycols and dipropylene glycol methyl ether are different materials. A pure structural isomer with a separate CAS number should also not be treated as a universal synonym for the commercial isomer mixture.

COMMON PRODUCT & CHEMICAL NAMES OF DIPROPYLENE GLYCOL DPG

Dipropylene glycol, DPG, dipropyleneglycol, oxybispropanol, oxydipropanol, propanol oxybis-.

Regular, industrial, fragrance and low-odor describe commercial grade categories rather than different elemental formulas. Commercial designations such as DPG LO+ or DPG-FC identify supplier-specific products and acceptance criteria.

Names of finished masks, extracts or other products containing DPG are not chemical synonyms. Likewise, a name assigned to one isomer does not fully describe the distribution in every commercial grade.

IDENTIFICATION OF DIPROPYLENE GLYCOL DPG

Product name: Dipropylene Glycol DPG
INCI name: Dipropylene Glycol
CAS No: 25265-71-8
EC / EINECS No: 246-770-3
Formula of the constituent isomers: C6H14O3
Molar mass: approximately 134.17 g/mol
Chemical class: ether-containing diol
Main functions: solvent, carrier, humectant, coupling agent and reactive intermediate

An isomer mixture does not acquire a molecular weight of 268.35 g/mol simply because a database represents two components together. The individual DPG isomers have the same approximately 134.17 g/mol mass. Confirm product identity and the grade specification together when purchasing.

MOLECULAR CHARACTER OF DIPROPYLENE GLYCOL DPG

Each DPG molecule has two hydroxyl groups and an ether oxygen. Their arrangement differs among structural isomers, but the material remains a small glycol rather than a high-molecular-weight polyether resin. Hydrogen bonding accounts for its affinity for water and contributes to its hygroscopic behavior.

The hydroxyl groups also distinguish the glycol from its methyl ether derivative. In reactive systems they contribute to functional-group balance. A theoretical hydroxyl equivalent weight based on two OH groups is approximately 67.09 g/eq, but actual reaction design must account for assay, moisture and the other raw materials.

HOW DIPROPYLENE GLYCOL DPG FUNCTIONS IN A FORMULATION

As a solvent, the glycol can dissolve compatible organic ingredients and help connect components with different polarity. Its complete miscibility with water does not mean that every fragrance or oil dissolved in DPG remains clear after water dilution. The final composition needs its own compatibility test.

As a humectant, it interacts with water within a suitable formulation. Sensory outcome depends on concentration and the other humectants, so greater addition does not necessarily improve feel. A cosmetic role is not proof of deeper delivery of actives or universal reduction of irritation.

In resin chemistry, the diol can form ester or urethane linkages through its hydroxyl groups. This is different from acting as a free-radical polymerization initiator. Reactive incorporation must also be distinguished from simply adding an external plasticizer to a finished polymer.

TECHNICAL PROPERTIES OF DIPROPYLENE GLYCOL DPG

Representative regular-grade data describe a distillation interval of 228-236°C at atmospheric pressure, density of about 1.022 g/cm³ at 25°C and dynamic viscosity of about 75 mPa·s at 25°C. At 60°C, the same dataset gives approximately 10.9 mPa·s, illustrating the importance of temperature in viscosity comparisons.

That dataset also gives a refractive-index interval of 1.439-1.442 at 20°C and a Pensky-Martens closed-cup flash point of approximately 124°C. These are descriptive grade data, not guaranteed limits for every industrial or fragrance product. Other suppliers and test methods can give different flash-point values.

A representative industrial sales specification requires at least 99.50% DPG on a dry basis and permits no more than 0.100% water. It separately limits residual propylene glycol, acidity, color, chlorides and iron. A dry-basis assay must not be confused with an as-supplied concentration that includes water.

Odor is a separate acceptance property in fragrance grades. Testing may include a defined sensory procedure alongside chromatographic analysis. Isomer consistency, contamination during transfer and storage history can matter even when total assay remains within limits.

Some DPG products supercool, so a pour point or an observed freezing range should not be treated as one universal sharp melting point. For a required low-temperature handling condition, obtain the relevant grade data from Ataman Kimya.

DIPROPYLENE GLYCOL DPG IN FRAGRANCE DEVELOPMENT

A low-odor grade provides a carrier for compatible fragrance ingredients without adding a strong solvent note. Its low volatility can affect the release profile, but it does not guarantee longer-lasting fragrance or identical odor development in every composition.

Evaluate both the intermediate and its intended dilution. A clear concentrate can become cloudy in water or behave differently in ethanol. Changes in the top notes, intensity, residue and packaging compatibility should be assessed at a defined application level.

DPG is not automatically suitable for every wax, hydrocarbon oil or candle base. Compatibility, combustion or other end-use behavior must not be inferred from its usefulness in perfumery. This article does not establish a general soap-inhibition threshold or a universal fragrance dosage.

INDUSTRIAL APPLICATIONS OF DIPROPYLENE GLYCOL DPG

Polyester and alkyd resins: the diol serves as a reactive building block. Equivalent balance, water control and reaction conditions influence molecular development and final properties.

Polyurethane systems: hydroxyl functionality allows use as a reactive component, including chain-extension applications where appropriate. Moisture can interfere with isocyanate chemistry, so actual water content matters.

Paints, coatings and inks: evaluate solvency, coupling, viscosity and drying behavior within the complete binder system. High boiling behavior can be useful for retention but may also affect drying or residual feel.

Cleaning formulations: the glycol can serve as a solvent or coupling component alongside the appropriate surfactants. It is not itself a complete detergent or a guarantee of fragrance solubilization.

PERSONAL-CARE USE OF DIPROPYLENE GLYCOL DPG

Suitable grades are used in fragrances, deodorants, skin-care and toiletry formulations. The INCI name is Dipropylene Glycol, with solvent and humectant roles supported by manufacturer descriptions. Formulation compatibility and finished-product tolerability remain separate from the raw-material name.

Cosmetic safety reviews list DPG as safe as used within the practices evaluated. That conclusion should not be expanded to unrestricted use by every route. Food, pharmaceutical and inhalation applications require their own grade and supplier authorization, which a fragrance designation does not establish.

WHICH PROBLEMS CAN DIPROPYLENE GLYCOL DPG HELP ADDRESS?

Unwanted carrier odor: select a documented low-odor grade and verify it in the actual fragrance, rather than assuming every technical grade is odor-neutral.

Poor dissolution of a compatible ingredient: evaluate a glycol solution at the intended strength and temperature, including stability after further dilution.

Unbalanced water response in a cosmetic: assess DPG as part of the humectant package, checking feel and product stability together.

Inconsistent resin results: connect moisture, assay and reactive-equivalent control with batch performance instead of relying only on the product name.

FORMULATION POINTS FOR DIPROPYLENE GLYCOL DPG

Set the target function before selecting the grade. A solvent trial, a fragrance carrier and a resin feed require different acceptance tests.

Record water content and whether assay is dry-basis or as supplied.
Specify odor criteria where sensory quality matters.
Verify compatibility after water or ethanol dilution.
Separate neat-glycol properties from finished-product viscosity.
Account for hydroxyl groups in reactive formulations.
Confirm preservation of water-containing cosmetics.
Check supplier restrictions for the proposed end use.

Avoid interpreting DPG as a universal emulsifier, preservative or fragrance fixative. The full formula and the intended use determine the required evidence.

STARTING COMPOSITIONS WITH DIPROPYLENE GLYCOL DPG

The examples below are proposed laboratory starting points, not validated commercial products. Percentages are by mass of the entire initial blend, with raw materials as supplied. Confirm purity, compatibility, application limits and any required preservation before further development.

DIPROPYLENE GLYCOL DPG EXAMPLE 1: FRAGRANCE-INGREDIENT STOCK SOLUTION

Components:

Low-odor fragrance-grade Dipropylene Glycol: 90.00%
Phenethyl Alcohol: 10.00%
Total: 100.00%

This is a model intermediate for solvent and sensory evaluation, not a finished perfume or a recommendation for direct skin application. The selected 10% solute level is a screening concentration, not an established universal use limit.

Evaluation criteria:

Clarity and stability at the intended storage temperatures
Odor contribution of the carrier and solution
Mass accuracy and batch identification
Compatibility in the intended subsequent formulation
Packaging response and color changes during storage

Apply the safety information of both ingredients and evaluate the resulting blend separately.

DIPROPYLENE GLYCOL DPG EXAMPLE 2: HUMECTANT-CONTAINING EMULSION

Components:

Demineralized water: 80.80%
Cosmetic-grade Dipropylene Glycol: 2.00%
Glycerin: 2.00%
Caprylic/Capric Triglyceride: 8.00%
Cetearyl Alcohol and Cetearyl Glucoside emulsifier blend: 4.00%
Cetearyl Alcohol: 2.00%
Xanthan Gum: 0.20%
Phenoxyethanol: 0.80%
Ethylhexylglycerin: 0.20%
Total: 100.00%

The 2% DPG level illustrates a modest aqueous-phase contribution. It does not establish a fixed optimum or prove long-term moisturization. Choose processing conditions for the actual emulsifier and preservative products, and deduct any pH-adjustment additions from water.

Evaluation criteria:

Emulsion stability and rheology after storage
Finished-product pH and preservative suitability
Spreading, tack and after-feel
Microbiological quality and preservative efficacy
Packaging compatibility and finished-product safety

DPG at this level is not a substitute for a validated preservation system. All changes require rebalancing to 100% and appropriate retesting.

ALTERNATIVES TO DIPROPYLENE GLYCOL DPG

Propylene glycol: a smaller glycol with different physical properties. Compare solvent capacity, sensory effects and any required grade documentation before substitution.

Butylene glycol: another cosmetic solvent and humectant option, with its own identity and performance profile. Equal percentages do not imply equal feel or solubility.

Glycerin: a highly hydrophilic humectant that can play a complementary role, but does not necessarily replace DPG's fragrance solvency.

Ethanol: a more volatile solvent with a substantially different evaporation profile and flammability behavior. Replacement changes formulation handling and odor release.

Tripropylene glycol: a longer glycol product whose viscosity, volatility and application specification should be considered separately. Dipropylene glycol methyl ether is also a distinct solvent, not simply another grade of DPG.

PURCHASING AND QUALITY CONTROL OF DIPROPYLENE GLYCOL DPG

The order should identify CAS 25265-71-8, EC 246-770-3 and the required industrial, cosmetic or fragrance grade. Specify neat liquid or any supplied dilution, then align assay, water, odor and impurity limits with the actual use.

Review the batch COA, technical specification and current SDS. Include the analytical methods, packaging, traceability and relevant application statements. A high-purity industrial result is not equivalent to a sensory release for fragrance use.

Price varies with grade control, quantity, packaging and documentation. Contact Ataman Kimya to clarify missing acceptance criteria or supply restrictions before comparing offers.

STORAGE AND TRANSPORT OF DIPROPYLENE GLYCOL DPG

Keep the hygroscopic liquid in tightly closed, clean, labeled containers. Protect it from moisture uptake, foreign odors and contamination. Store away from strong oxidizers and other incompatible materials identified for the grade, and obtain storage limits and shelf life from Ataman Kimya.

Clean spills with suitable containment and absorbent materials, prevent slipping and keep concentrated product out of drains. Arrange disposal according to the local waste requirements.

A reviewed 2026 fragrance-grade supplier SDS reports no dangerous-goods regulation under DOT, IMDG and IATA for its product. Confirm the current transport determination for the offered grade instead of assigning a universal UN number to every formulation containing DPG.

SAFETY INFORMATION OF DIPROPYLENE GLYCOL DPG

The reviewed fragrance-grade SDS reports the product as not classified under its US GHS framework. This is not permission for unrestricted ingestion, inhalation or use in an unassessed product. Applicable labeling and workplace controls must follow the current supplied-grade information.

Use suitable eye protection, gloves and ventilation for the operation. Rinse exposed eyes with water and wash skin after contact, obtaining medical advice for persistent symptoms or significant exposure. Do not induce vomiting after ingestion and seek medical assistance.

DPG can burn when sufficiently heated, despite its relatively high flash point and low ambient volatility. Control ignition sources in heated work, avoid strong oxidizers and prevent environmental release. Assess the hazards of mixtures from their complete composition.

SUPPLY OF DIPROPYLENE GLYCOL DPG FROM ATAMAN KIMYA

ATAMAN KİMYA can be contacted for Dipropylene Glycol DPG supply in an appropriate grade. Confirm availability, specification, packaging and documentation for the proposed application.

Include the target function, odor requirements, water limit, trial or production quantity and delivery destination in the inquiry. State any special application documentation needs rather than assuming that one DPG grade covers all uses.

FREQUENT QUESTIONS ABOUT DIPROPYLENE GLYCOL DPG

What does DPG mean?
Dipropylene glycol, a small ether-containing diol used as a solvent and reactive intermediate.

Which identifiers apply here?
CAS 25265-71-8 and EC 246-770-3.

What is its molecular weight?
Approximately 134.17 g/mol for formula C6H14O3.

Is commercial DPG one structural isomer?
No, it normally contains related structural isomers.

Is it miscible with water?
Yes, it is completely miscible.

Does water miscibility guarantee a clear diluted perfume?
No, the fragrance and complete solvent balance still determine clarity.

Why choose a fragrance grade?
Its odor and consistency are controlled for sensory-sensitive applications.

Can regular grade be selected only by purity?
No, odor, water and application-specific requirements also matter.

Is DPG a low-viscosity liquid like water?
No, representative grades are medium-viscosity liquids, with values strongly dependent on temperature.

Is DPG a polymerization initiator?
It is not a free-radical initiator, though it can serve as a reactive diol in appropriate polymer chemistry.

How is it used in polyurethane systems?
Its hydroxyl groups can react in suitable formulations, with moisture and equivalent balance controlled.

Does it always extend fragrance longevity?
No, it can change release behavior, but longevity must be assessed in the complete fragrance.

Is it the same as dipropylene glycol methyl ether?
No, the methyl ether is a different solvent with different functionality.

Does it preserve a lotion at 2%?
That level must not be treated as a validated preservation system.

Can every grade be used in food or pharmaceuticals?
No, application-specific qualification and supplier restrictions must be checked.

Does the pour point equal a universal melting point?
No, commercial isomer mixtures can supercool and require grade-specific handling data.

What should be checked before storage?
Container closure, moisture protection, compatibility and the offered grade's storage conditions.

Which documents should accompany a purchase?
A batch COA, relevant specification, current SDS and required application documentation.

DIPROPYLENE GLYCOL DPG - TECHNICAL SUMMARY

Dipropylene Glycol DPG is a commercial glycol isomer mixture identified by CAS 25265-71-8 and EC 246-770-3. Its constituent isomers share formula C6H14O3 and molar mass approximately 134.17 g/mol.

Water miscibility, hygroscopicity and low volatility support its use as a solvent, coupling agent and humectant. Viscosity and other numerical properties should be linked to their temperature and actual grade.

Fragrance grades emphasize odor and sensory consistency, while industrial grades serve resin, coating and cleaning applications. High assay alone does not make these grades interchangeable.

Hydroxyl functionality also enables use as a reactive component in suitable polyester and polyurethane chemistry. That role must be separated from free-radical initiation and from simple external plasticization.

Finished-formulation compatibility, preservation and safety require their own assessment. Supply-chain documentation and grade-specific restrictions remain important for any proposed use.

Dipropylene Glycol DPG can be sourced from ATAMAN KİMYA. For further information and supply inquiries about Dipropylene Glycol DPG, please contact ATAMAN KİMYA.