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EXOLIT AP 462

CAS:    68333-79-9

Description    
Exolit AP 462 is liquid fertilizers with compositions up to 11-37-0, manufactured by the reaction of anhydrous ammonia with superphosphoric acid. 
Exolit AP 462 is made by the concentration of regular wet-process acid up to P2O5 concentrations of 78%. 
Granular polyphosphates suitable for bulk blending are made by reacting ammonia with regular wet process acid of 52% P2O5 content and using the heat of reaction to drive off water to produce a phosphate melt of 10-43-0, with about 40% of the phosphorus in the polyphosphate form.
Exolit AP 462 is a product based on ammonium polyphosphate. 
The crystal modification is phase II. 
Exolit AP 462 is a fine-particle white powder with very low solubility in water, even at elevated temperatures. 
Exolit AP 462 is completely insoluble in organic solvents. 
Exolit AP 462 is non-hygroscopic and non-flammable. 
Exolit AP 462 is ammonium polyphosphate. 
Acts as a flame retardant. 
Exolit AP 462 is non-hygroscopic and non-flammable. 
Is largely insoluble in water and completely insoluble in organic solvents. 
Exolit AP 462 imparts a good flame-retardant effect to adhesives and sealants when Exolit AP 462 is incorporated into the base formulation at the rate of 10-20%. 
Exolit AP 462 has a shelf life of 12 months.


Uses    
Exolit AP 462 is a specialty chemical that finds many different uses in key industries.  
Exolit AP 462, is an environment-friendly and halogen-free flame retardant. 
Exolit AP 462 is the main constituent of many intumescent flame retardant systems: coatings, paints and engineering plastics. 
Exolit AP 462 is used to prepare 20% Phosphorous/Nitrogen containing flame retardants, Exolit AP 462 can be used solely or in conjunction with other materials in the flameproof treatment for textiles, papers, fibers and woods. 
Special treatment can be used to prepare 50% high concentration flameproof formulations required for special applications.
The most common Exolit AP 462 have a N-P2O5-K2O (nitrogen, phosphorus and potassium) composition of 10-34-0 or 11-37-0. 
Polyphosphate fertilizers offer the advantage of a high nutrient content in a clear, crystal-free fluid that remains stable within a wide temperature range and stores well for long periods.
A variety of other nutrients mix well with polyphosphate fertilizers, making them excellent carriers of micronutrients typically needed by plants.

Benefits
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.
Exolit AP 462 can be used for all applications where ammonium polyphosphate is suitable.
Exolit AP 462 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 its 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. 
The application of Exolit AP 462 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 462 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.
Non-halogenated flame retardant with favorable environmental and health profile.

TYPICAL APPLICATIONS
Exolit AP 462 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 462 should be compensated by increasing the amount of product added. 
Exolit AP 462 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 462's low water solubility, Exolit AP 462 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 462 based intumescent coatings on wood or plastics enables these materials to qualify for Building Material Class B (DIN EN 13501-1). 
Exolit AP 462 imparts a good flame-retardant effect to adhesives and sealants is incorporated into the base formulation at the rate of 10 - 20 %. 
Polyurethane foams 
Exolit AP 462 is a suitable non-halogenated flame retardant for polyurethane foams. 
If handling of Exolit AP 462 as a solid is not possible we recommend the dosage of the flame retardant by preparing an Exolit AP 462/polyol-suspension. 
Because of the low acid number of Exolit AP 462 it is also possible to incorporate this flame retardant in an isocyanate suspension. 
To prevent the solid from settling the Exolit AP 462 suspensions should be stirred or circulated by pump. 

Other applications 
Exolit AP 462 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 462. 
Casting resins based on epoxy resins or unsaturated polyester resins achieve the classification UL94-V0 with Exolit AP 462.

Synonyms:    
polyphosphoric acids ammonium salts;
APP;
APP-0;
XAP-01;
APP-3;
APP-1;
ammonium polyphosphate flame retardant;
Ammonium polyphosphate

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