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EXOLIT AP 468 is a halogen-free, environmentally friendly flame retardant based on ammonium polyphosphate (APP), supplied as a fine, white, free-flowing powder with very low water solubility and high thermal stability.
EXOLIT AP 468 functions mainly in the condensed phase by promoting the formation of a stable, insulating char layer during fire exposure, thereby reducing heat transfer and suppressing the release of combustible gases.
Widely used in intumescent coatings, polyurethane foams, epoxy resins, adhesives, sealants, and composites, EXOLIT AP 468 enables compliance with stringent fire safety standards while maintaining processing stability and long-term durability.
CAS Number: 68333-79-9
EC Number: 269-789-9
Molecular Formula: (NH4PO3)n
Synonyms: Ammonium polyphosphate (APP), Ammonium polyphosphate, Phase II, APP Phase II, Crystalline ammonium polyphosphate, Ammonium phosphate polymer, Polymeric ammonium phosphate, Polyphosphoric acid, ammonium salt, Ammonium metaphosphate (polymeric form), APP flame retardant, Intumescent additive, APP-based, Ammonium polyphosphate fine grade, High molecular weight ammonium polyphosphate, Long-chain ammonium polyphosphate, Ammonium polyphosphate, crystalline Phase II, Ammonium polyphosphate, polymeric type, Polyphosphate of ammonium, Polyphosphoric acid ammonium ester, Ammonium polyphosphate FR additive, Phosphorus-based intumescent agent, Non-halogenated APP flame retardant, Halogen-free ammonium polyphosphate, Ammonium polyphosphate powder, APP-based char promoter, Ammonium polyphosphate intumescent pigment, Polyphosphate (ammonium salt), Polyphosphate flame retardant, Ammonium polyphosphate retardant grade, Ammonium polyphosphate intumescent grade, APP crystalline grade II, APP high stability grade, Ammonium polyphosphate insoluble type, Low-solubility ammonium polyphosphate, Ammonium polyphosphate, technical grade, APP FR-II (Phase II, flame retardant), Phosphoric acid polymer, ammonium salt, APP intumescent coating additive, Ammonium polyphosphate, fireproofing agent, APP-type phosphorus flame retardant, APP, high polymerization degree, Intumescent system char former, Ammonium polyphosphate eco-friendly FR, APP-based phosphorus additive, APP powder, Phase II, fine particle, APP P-II (Phase II ammonium polyphosphate), Ammonium polyphosphate crystalline flame retardant, APP thermal stabilizer additive, APP phosphorus-based FR pigment, APP Clariant grade (Exolit® AP series), Ammonium polyphosphate industrial grade, Ammonium polyphosphate (NH₄PO₃)n
EXOLIT AP 468 is an ammonium polyphosphate–based flame retardant belonging to the non-halogenated Exolit AP product line, designed to provide efficient fire protection in a wide range of polymer applications.
EXOLIT AP 468 is a fine-particle, white, free-flowing powder with high thermal stability and low water solubility, making it suitable for both thermoset and thermoplastic systems.
EXOLIT AP 468 functions mainly in the condensed phase by promoting char formation, thereby insulating the material and suppressing the release of flammable gases during combustion.
EXOLIT AP 468 is widely used in intumescent coatings, adhesives, sealants, polyurethane foams, epoxy resins, and fiber-reinforced composites, where it contributes to achieving stringent fire safety standards.
Due to its halogen-free nature, EXOLIT AP 468 is considered an environmentally friendly flame retardant, offering low smoke emission and low toxicity during fire exposure.
EXOLIT AP 468's stability across a broad pH range and compatibility with various resin systems also make it a preferred additive in construction materials, transportation, and electrical/electronic applications.
EXOLIT AP 468 acts as a halogen-free, micro-encapsulated flame retardant.
EXOLIT AP 468 is based on a non-hygroscopic and non-flammable, highly water resistant ammonium polyphosphate (APP).
Designed for solvent-based, semi- and fully- exposed intumescent coatings on wood or plastics and enables these materials to qualify for Building Material Class B.
EXOLIT AP 468 is suggested for PU resins, paper and wood gel coats, back and cable coatings.
Casting resins based on epoxy or unsaturated polyester resins achieve the classification UL94-V0.
Provides low viscosity in aqueous suspension, lower heat stability and improved powder flowability.
Suitable as an "acid donor" and coated steel structures can meet the requirements of fire resistance classes specified in EN, DIN, BS and ASTM.
EXOLIT AP 468 also enables to pass pool test (Dunkin’ Cookie Test) even at 35°C and enhances the water stability.
Coatings based on EXOLIT AP 468 can pass Climate Chamber Test according to ETAG 018-Y without topcoat.
Designed for polyurethane foams, insulation, dispersion, fibre/ fabric treatment and rubber seals.
EXOLIT AP 468 is manufactured from long-chain phase II APP by micro-encapsulation with melamine formaldehyde resin according to unique method.
Provides low viscosity in aqueous suspension, lower heat stability and improved powder flowability.
EXOLIT AP 468 is suggested for PU resins, epoxy or unsaturated polyester resins.
EXOLIT AP 468 is a free flowing white powder with very low solubility in water, even at elevated temperatures.
Additionally, EXOLIT AP 468 is completely insoluble in organic solvents.
EXOLIT AP 468 is non-hygroscopic and non-flammable.
EXOLIT AP non-halogenated flame retardants are safer and more sustainable alternatives to volatile and scrutinized flame retardants such as halogenated and non-halogenated phosphate esters.
EXOLIT AP 468s are based on high molecular weight ammonium polyphosphate (phase II).
Because of lower solubility in water, catalyst interaction is reduced.
EXOLIT AP 468 can be used on their own in synergistic combinations.
EXOLIT AP 468 microcapsule APP (second stage), suitable for harsh external applications
EXOLIT AP 468 is a newly developed test product based on ammonium polyphosphate (APP).
EXOLIT AP 468 is a free-flowing white powder with extremely low water solubility even at high temperatures.
In addition, EXOLIT AP 468 is completely insoluble in organic solvents.
EXOLIT AP 468 is a halogen-free, environmentally friendly flame retardant belonging to the family of ammonium polyphosphates (APP) that are widely recognized for their efficiency in fire protection and their compliance with modern sustainability requirements.
EXOLIT AP 468 is supplied as a fine, white, free-flowing powder with controlled particle size distribution, very low water solubility, and high thermal stability, making it suitable for use in both thermoplastics and thermoset resin systems.
EXOLIT AP 468 works primarily in the condensed phase, where it promotes the formation of a stable, insulating char layer when exposed to fire.
This char barrier reduces heat transfer to the underlying material and suppresses the release of combustible volatiles, significantly lowering the flammability of the end product.
Because of these properties, EXOLIT AP 468 has become an essential additive in a wide range of applications.
EXOLIT AP 468 is a key component of intumescent coating systems, where it contributes to the formation of thick, foamed carbonaceous layers that protect structural steel, wood, and construction materials from fire.
In polyurethane foams, epoxy resins, adhesives, and sealants, EXOLIT AP 468 provides reliable flame retardancy without negatively affecting the mechanical or processing properties of the polymer.
In fiber-reinforced composites, particularly those used in the building, transportation, and electrical/electronic sectors, EXOLIT AP 468 enables manufacturers to meet stringent fire safety regulations while maintaining performance and durability.
One of EXOLIT AP 468's major advantages lies in its halogen-free chemistry, which ensures low smoke density and low toxicity during combustion compared with halogenated flame retardants.
This makes EXOLIT AP 468 more acceptable for modern applications that must meet both fire safety and environmental standards.
EXOLIT AP 468's high decomposition temperature and resistance to hydrolysis provide additional versatility, allowing it to perform well in demanding processing conditions and across a broad pH range.
Furthermore, EXOLIT AP 468 demonstrates good compatibility with a variety of resin systems, disperses easily in formulations, and maintains long-term stability in end-use products.
Overall, EXOLIT AP 468 represents a sustainable, high-performance flame retardant solution that combines fire protection efficiency with environmental responsibility.
EXOLIT AP 468's balance of low water solubility, thermal stability, non-halogenated composition, and wide application range makes it a trusted choice in industries where both safety and sustainability are critical, such as construction, transportation, electronics, and protective coatings.
Market Overview of EXOLIT AP 468:
The global flame retardant market is undergoing a major transition toward halogen-free, environmentally compliant solutions, and EXOLIT AP 468, an ammonium polyphosphate (APP)-based additive, is positioned at the center of this shift.
Traditional halogenated flame retardants, while highly effective, are increasingly restricted due to concerns over toxic emissions, persistence in the environment, and regulatory bans in the EU, North America, and Asia.
This has created a strong and sustained demand for phosphorus-based alternatives such as APP, which offer excellent fire safety performance while meeting eco-labeling and green building requirements.
The ammonium polyphosphate segment is one of the fastest-growing within the non-halogenated flame retardant market.
EXOLIT AP 468 is projected to expand steadily, supported by high adoption in construction materials, transportation, electrical/electronic components, coatings, and textiles.
EXOLIT AP 468 is particularly valuable in intumescent coatings for structural steel and wood, where construction codes increasingly require advanced fire protection.
Rising urbanization, stricter safety regulations, and demand for fire-resistant building materials are accelerating EXOLIT AP 468's use in Asia-Pacific, while in Europe and North America the growth is strongly driven by sustainability policies and green chemistry regulations.
In polyurethane foams, epoxy resins, adhesives, and fiber-reinforced composites, EXOLIT AP 468 provides manufacturers with a reliable route to achieve compliance with stringent flame retardancy standards such as UL 94, EN 13501, and aviation/rail transport fire safety requirements.
EXOLIT AP 468's advantages—low water solubility, high thermal stability, and non-halogenated chemistry—make it well-suited for long-term, high-performance applications.
Overall, the market for EXOLIT AP 468 is being propelled by regulatory pressures, sustainability trends, and end-user demand for safer, non-toxic flame retardants.
While cost competitiveness and raw material volatility remain challenges, EXOLIT AP 468’s balance of fire protection efficiency, processing versatility, and eco-friendly profile ensures a strong and growing market presence across multiple sectors.
Applications of EXOLIT AP 468:
EXOLIT AP 468 is applied across a wide range of industries where fire protection and environmental compliance are critical.
EXOLIT AP 468 is a key ingredient in intumescent coatings for steel structures, wood, and building materials, where it enables the formation of thick, insulating char layers that protect substrates under fire exposure.
In construction products such as gypsum boards, insulation systems, and wood panels, EXOLIT AP 468 delivers durable flame retardancy that complies with modern building codes.
In the polyurethane sector, EXOLIT AP 468 is used in both rigid and flexible foams for furniture, automotive interiors, and insulation boards, offering improved flame resistance without impairing foam performance.
EXOLIT AP 468 is also widely adopted in epoxy resins, adhesives, sealants, and fiber-reinforced composites, where it provides reliable fire safety for applications in transportation, electrical/electronic components, and industrial equipment.
EXOLIT AP 468's versatility, halogen-free nature, and ability to maintain mechanical and processing properties make EXOLIT AP 468 a trusted flame retardant across diverse application fields.
EXOLIT AP 468 can be used for all applications.
Ammonium polyphosphate is suitable for all applications.
If a specific phosphorus content is required to obtain the desired effect, the phosphorus content of EXOLIT AP 468 should be lower to compensate by increasing the amount of product added.
EXOLIT AP 468 can be advantageously used in intumescent coatings, among which Ammonium polyphosphate needs to have very low water solubility and low thermal stability at temperatures higher than 300°C to help more coatings to foam quickly.
The EXOLIT AP products are phosphorus-based flame retardants for polyurethanes that allow meeting stringent emission and migration requirements, because they are inorganic solids with low vapor pressure and solubility.
EXOLIT AP 468 can be used for all applications ammonium polyphosphate is suitable for.
In cases where a specific phosphorus content is required to obtain the desired effect, the lower phosphorus content of EXOLIT AP 468 should be compensated by increasing the amount of product added.
EXOLIT AP 468 can be used advantageously in intumescent coatings where the ammonium polyphosphate is required to have extremely low water solubility and where lower heat stability at temperatures above 300 °C contributes to more rapid foaming of the coating.
Intumescent Coatings:
On account of EXOLIT AP 468 low water solubility, EXOLIT AP 468 (TP) is particularly suitable as an ”acid donor” for intumescent coatings.
Other essential components of intumescent systems include a binder, a carbon donor (e.g. pentaerythritol) and a blowing agent (e.g. melamine).
On exposure to flame, the intumescent coatings form a carbonaceous foam which effectively shields the underlying material from temperature increases.
Steel structures coated with intumescent paints can meet the requirements of fire resistance classes specified in EN, DIN, BS, ASTM and others.
The application of EXOLIT AP 468 based intumescent coatings on wood or plastics enables these materials to qualify for Building Material Class B (DIN EN 13501-1).
Intumescent coatings are needed for external use in regions with challenging high humidity conditions.
Intumescent coating formulations with standard encapsulated APP can create blooming or bubbles and loose EXOLIT AP 468 effect as flame retardant under these conditions.
A well accepted test is the water ponding test, also known as “pool-test” or so called “dunkin’-cookie” test.
EXOLIT AP 468 meets these demanding requirements and is well suited for all IC systems for external use.
EXOLIT AP 468 imparts a good flame-retardant effect to adhesives and sealants when EXOLIT AP 468 is incorporated into the base formulation at the rate of 10 - 20 %.
Polyurethane Foams:
EXOLIT AP 468 is a suitable non-halogenated flame retardant for polyurethane foams.
If handling of EXOLIT AP 468 as a solid is not possible we recommend the dosage of the flame retardant by preparing an EXOLIT AP 468/polyol-suspension.
To prevent the solid from settling the EXOLIT AP 468 suspensions should be stirred or circulated by pump.
Other Applications of EXOLIT AP 468:
EXOLIT AP 468 has an excellent flame-retardant effect in cellulose-containing materials such as paper and wood products.
With chipboard products the B classification according to DIN EN 13501-1 can be achieved by adding 15 - 20 % EXOLIT AP 468.
Casting resins based on epoxy resins or unsaturated polyester resins achieve the classification UL94-V0 with EXOLIT AP 468.
Benefits of EXOLIT AP 468:
Extremely low water solubility.
Completely insoluble in organic solvents, non-hygroscopic and non-flammable.
Even lower viscosity in aqueous suspension, lower heat stability in the temperature range > 300 °C and improved powder flowability in comparison to EXOLIT AP 422.
Enables to achieve requirements concerning weatherability (e.g. ETAG 018-2, Type Y) without applying a top coat.
Enhances the durability of solvent based intumescent coatings in challenging weather conditions (e.g. high humidity and elevated temperatures).
The application of EXOLIT AP 468 based intumescent coatings on wood or plastics enables these materials to qualify for Building Material Class B (DIN EN 13501-1).
Imparts a good flame-retardant effect to adhesives and sealants when EXOLIT AP 468 is incorporated into the base formulation at the rate of 10 - 20%.
Suitable non-halogenated flame retardant for polyurethane foams.
Excellent flame-retardant effect in cellulose-containing materials such as paper and wood products.
With chipboard products, the B classification according to DIN EN 13501-1 can be achieved by adding 15 - 20 %.
Casting resins based on epoxy resins or unsaturated polyester resins achieve the classification UL94-V0.
Can be used for all applications where ammonium polyphosphate is suitable.
Can be used advantageously in intumescent coatings where the ammonium polyphosphate is required to have extremely low water solubility and where lower heat stability at temperatures above 300 °C contributes to more rapid foaming of the coating.
Particularly suitable as an ”acid donor” for intumescent coatings thanks to EXOLIT AP 468 low water solubility.
Steel structures coated with intumescent paints can meet the requirements of fire resistance classes specified in EN, DIN, BS, ASTM and others.
Non-halogenated flame retardant with favorable environmental and health profile.
Advantages of EXOLIT AP 468:
Very low water solubility.
Completely insoluble in organic solvents, non-hygroscopic, non-flammable.
The viscosity in the aqueous suspension is even lower, and the thermal stability in the temperature range is lower> compared with EXOLIT, 300°C and improved powder flowability AP 422.
EXOLIT AP 468 can meet the weather resistance requirements without applying top coat (for example, ETAG 018-2, Y type).
Improve the durability of solvent-based intumescent coatings in challenging weather conditions (such as high humidity and high temperature).
The application of EXOLIT is based on AP 468 wood or plastic intumescent coatings to make these materials comply with building material class B (DIN EN 13501-1).
When the adhesive and sealant have good flame retardant effect, add EXOLIT AP 468 to the basic formula at a ratio of 10-20%.
Non-halogenated flame retardant suitable for polyurethane foam.
Wood products with excellent flame retardant effect in cellulose-containing materials (such as paper and paper).
With particleboard products, according to DIN EN 13501-1 Class B classification can be added 15-20%.
Casting resin based on epoxy resin or unsaturated polyester resin reaches the classification UL94-V0.
EXOLIT AP 468 is suitable for all applications where ammonium polyphosphate is suitable.
EXOLIT AP 468 can be advantageously used in intumescent coatings, where ammonium polyphosphate is required to have very low water solubility, and lower thermal stability at temperatures higher than 300°C contributes to faster coating foaming Particularly suitable as an "acid donor".
Due to EXOLIT AP 468s low water solubility, EXOLIT AP 468 can be used for intumescent coatings.
The steel structure coated with intumescent coating can meet the fire resistance requirements specified by EN, DIN, BS, ASTM, etc.
Production of EXOLIT AP 468:
EXOLIT AP 468 is produced through a controlled polycondensation process of phosphoric acid with ammonia, yielding ammonium polyphosphate (APP) with defined chain length, particle size, and stability.
The process begins with high-purity phosphoric acid, which is reacted with gaseous ammonia under elevated temperature and pressure.
Through stepwise condensation, phosphate chains are formed and stabilized, producing a crystalline, polymeric ammonium polyphosphate of the so-called “phase II” type, known for its low solubility in water and high thermal stability.
Following synthesis, EXOLIT AP 468 undergoes cooling, milling, and classification to achieve the fine, free-flowing powder with narrow particle size distribution characteristic of EXOLIT AP 468.
Surface treatment steps may be applied to further reduce water solubility and dusting, thereby improving handling, storage stability, and compatibility with various resin systems.
Strict quality control ensures consistency in particle morphology, phosphorus content, and thermal decomposition profile, which are essential for reproducible flame-retardant performance in end-use applications.
As part of Clariant’s Exolit® technology platform, production also emphasizes environmental responsibility and safety, with closed-system handling of ammonia, recovery of by-products, and compliance with REACH and other international regulations.
This ensures that EXOLIT AP 468 meets both performance and sustainability criteria, making it a reliable halogen-free flame retardant for global markets.
History of EXOLIT AP 468:
The development of EXOLIT AP 468 is rooted in the broader history of ammonium polyphosphate (APP) flame retardants, which emerged in the mid-20th century as a safer and more environmentally acceptable alternative to halogenated systems.
In the 1960s and 1970s, research into intumescent coatings demonstrated the effectiveness of APP in promoting char formation and protecting substrates from heat, leading to its adoption in construction and industrial fire-protection products.
Early APP products, however, were limited by issues such as relatively high water solubility and inconsistent thermal stability, which restricted their performance in demanding applications.
To address these limitations, advances in polycondensation chemistry enabled the production of APP with longer polymer chains, higher phase stability (so-called “phase II” APP), and reduced solubility.
This breakthrough allowed for the creation of durable, fine-particle APPs such as EXOLIT AP 468, specifically engineered to combine fire protection efficiency with processing stability.
By the late 20th century, as regulatory pressure mounted against halogenated flame retardants due to concerns over toxicity and persistent organic pollutants, the demand for halogen-free, phosphorus-based alternatives grew rapidly.
Clariant, a global leader in specialty chemicals, developed the Exolit® line to meet this demand, offering a range of halogen-free flame retardants optimized for coatings, plastics, foams, and composites.
EXOLIT AP 468 became a flagship product in this portfolio, designed for intumescent coatings, polyurethane foams, epoxy resins, and composites where high performance and environmental compliance are critical.
Today, EXOLIT AP 468 reflects the evolution of APP technology—from a niche additive to a mainstream solution aligned with modern sustainability, fire safety regulations, and green building standards.
Handling and Storage of EXOLIT AP 468:
Handling:
Avoid contact with skin, eyes, and clothing.
Prevent dust formation and avoid inhalation of airborne particles.
Use only with adequate ventilation or local exhaust.
Do not ingest.
Handle in accordance with good industrial hygiene and safety practices.
Storage:
Store in tightly closed containers in a cool, dry, and well-ventilated area.
Protect from moisture and humidity to prevent caking.
Keep away from strong oxidizing agents and sources of heat.
Recommended storage temperature: ambient (15–25 °C).
Stability and Reactivity of EXOLIT AP 468:
Stability:
Stable under normal handling and storage conditions.
Reactivity:
No hazardous reactions known under recommended use.
Incompatible materials:
Strong oxidizers, strong acids, and strong bases.
Hazardous decomposition products:
Thermal decomposition may release ammonia, phosphoric acid derivatives, and phosphorus oxides (POₓ).
Conditions to avoid:
Prolonged heating above decomposition temperature (>300 °C), direct flame, or exposure to moisture.
First Aid Measures of EXOLIT AP 468:
Inhalation:
If dust is inhaled, move person to fresh air.
Keep at rest.
Seek medical attention if respiratory irritation or discomfort persists.
Skin contact:
Wash with plenty of soap and water.
Remove contaminated clothing.
Seek medical advice if irritation develops.
Eye contact:
Rinse cautiously with water for at least 15 minutes, lifting eyelids occasionally.
Remove contact lenses if present and easy to do.
Seek medical attention if irritation continues.
Ingestion:
Rinse mouth with water.
Do not induce vomiting.
Drink water to dilute.
Seek medical help if large quantities are ingested or if discomfort occurs.
Firefighting Measures of EXOLIT AP 468:
Suitable extinguishing media:
Water spray, dry chemical, foam, or carbon dioxide (CO₂).
Unsuitable media:
Strong water jet may spread material.
Specific hazards:
EXOLIT AP 468 itself is non-flammable, but packaging may burn.
Thermal decomposition can release ammonia and phosphorus oxides, which may be irritating or corrosive.
Protective equipment for firefighters:
Wear self-contained breathing apparatus (SCBA) and full protective gear.
Cool exposed containers with water spray.
Accidental Release Measures of EXOLIT AP 468:
Personal precautions:
Wear protective equipment (gloves, goggles, dust mask if needed).
Avoid dust formation and ensure adequate ventilation.
Environmental precautions:
Prevent entry into drains, surface waters, or soil.
Large spills may make surfaces slippery.
Methods for cleaning up:
Collect mechanically (shovel, sweep, or vacuum with filter) into suitable containers for disposal.
Wash spill area with water after material removal.
Dispose of according to local/regional regulations.
Exposure Controls / Personal Protective Equipment of EXOLIT AP 468:
Engineering controls:
Provide local exhaust or general ventilation to keep airborne concentrations low.
Respiratory protection:
Normally not required; if dust levels exceed occupational exposure limits, wear an approved particulate respirator (P2/N95).
Hand protection:
Wear chemical-resistant gloves (nitrile, neoprene).
Eye protection:
Use safety glasses with side shields or chemical goggles.
Skin and body protection:
Wear protective clothing to minimize skin contact.
Hygiene measures:
Wash hands after handling.
Remove and wash contaminated clothing before reuse.
Do not eat, drink, or smoke in work areas.
Identifiers of EXOLIT AP 468:
Trade Name: EXOLIT® AP 468
Chemical Type: Inorganic, halogen-free flame retardant
CAS Number: 68333-79-9
EC / EINECS Number: 269-789-9
Molecular Formula: (NH₄PO₃)ₙ
Average Molecular Weight: Polymer – variable
HS Code: 3824.99
Appearance: Fine white, free-flowing powder
Odor: Odorless
Solubility in Water: Very low (<0.5 g/100 mL at 20 °C)
Supplier/Manufacturer: Clariant, Exolit® product line
CAS Number: 68333-79-9
EC / EINECS Number: 269-789-9
Molecular Formula: (NH₄PO₃)ₙ
Average Molecular Weight: Variable, typically n > 1000 (polymeric)
HS Code: 3824.99
REACH Registration: Registered in EU under APP group
Properties of EXOLIT AP 468:
Appearance: Fine white, free-flowing powder
Odor: Odorless
Bulk Density: ~0.7 g/cm³
pH (10% aqueous suspension): ~5.5–7.5
Solubility in Water: Very low (<0.5 g/100 mL at 20 °C) – lower than Phase I APP, giving higher durability
Decomposition Temperature: > 275–300 °C
Thermal Stability: Excellent, suitable for polymer processing temperatures up to ~280 °C
Hygroscopicity: Low, but product should be kept dry to prevent caking
Flammability: Non-flammable
Storage Stability: Stable under dry, ambient conditions; shelf life typically ≥ 24 months
Appearance: Fine white, free-flowing crystalline powder
Odor: Odorless
Bulk Density: ~0.7 g/cm³
Molecular Nature: Polymeric ammonium polyphosphate, Phase II (n > 1000)
pH (10% aqueous suspension): ~5.5–7.5 (near neutral)
Solubility in Water: Very low (<0.5 g/100 mL at 20 °C) → ensures durability in coatings and plastics
Decomposition Temperature: >275–300 °C (releases ammonia and phosphoric acid derivatives)
Thermal Stability: High; suitable for polymer processing up to ~280 °C
Viscosity: Not applicable (solid powder)
Flammability: Non-flammable
Hygroscopicity: Low; prolonged exposure to moisture may cause slight caking
Stability: Chemically stable under recommended storage conditions
Shelf Life: Typically ≥24 months if stored dry and protected from moisture
Other EXOLIT Products:
EXOLIT AP 420
EXOLIT AP 422
EXOLIT AP 423
EXOLIT AP 431
EXOLIT AP 435
EXOLIT AP 462
EXOLIT AP 740
EXOLIT AP 740
EXOLIT AP 740 S
EXOLIT AP 750
EXOLIT IFR 36
EXOLIT AP 761
EXOLIT AP 765
EXOLIT AP 766
EXOLIT OP 550
EXOLIT OP 560
EXOLIT OP 930
EXOLIT OP 935
EXOLIT OP 945
EXOLIT OP 950
EXOLIT OP 1230
EXOLIT OP 1240
EXOLIT OP 1248
EXOLIT OP 1260
EXOLIT OP 1311
EXOLIT OP 1312
EXOLIT OP 1314
EXOLIT OP 1400
EXOLIT EP 150
EXOLIT RP 607
EXOLIT RP 614
EXOLIT RP 6500
EXOLIT RP 6520
EXOLIT 855
EXOLIT 5060 PK
Viscofil-EXOLIT 5060
