Exolit® AP 422
Fine-grained white APP (phase II) powder with low water solubility

Exolit® AP 422

Fine-grained white APP (phase II) powder with low water solubility

Änderungsdatum :
Juli 25, 2013

Exolit AP 422 is a fine-particle ammonium polyphosphate (phase II) produced by a special method. The product is largely insoluble in water and completely insoluble in organic solvents. It is colourless, non-hygroscopic and non-flammable.

Benefits
  • Non-halogenated flame retardant with favorable environmental and health profile
  • Greatly reduced water solubility, low viscosity in aqueous suspension, very low acid number
  • 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. Their application 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 it is incorporated into the base formulation at the rate of 10 - 20%
  • Suitable non-halogenated flame retardant for polyurethane foams. PUR Foams with Exolit® AP 422 can be recycled
  • Excellent flame-retardant effect in cellulose-containing materials such as paper and wood products. With chipboard products, the DIN EN 13501-1 classification can be achieved by adding 15 - 20 % Exolit® AP 422
  • An essential component in intumescent formulations for thermoplastics, particularly polypropylene, for which the classification UL 94-V0 is specified for applications in the electrical sector
  • In the case of thermosets like epoxy resins and unsaturated polyester resins, it paves the way for the production of lightweight components with low solids content
  • (Bio-)degradable by breaking down to naturally occurring phosphate and ammonia
For regulatory details such as the classification and labeling as dangerous substances or goods please refer to our corresponding Material Safety Data Sheet.
Characteristics  Unit   Target value   DS¹) TD²)Test method 
Chemical Formula   [NH4PO3)]n
n > 1000  

☐ 

 
Phosphorus  % (w/w)   31.0 - 32.0  

Photometry after oxidizing dissolution; (11/17)  
Water / Moisture  % (w/w)   max. 0.25  

Thermogravimetry at 130 °C; (11/03)  
Nitrogen  % (w/w)   14.0 - 15.0  

Elemental analysis; (11/07)  
Density  g/cm³   1.9  

at 25 °C  
Bulk Density 

g/cm³  

approx. 0.7  

 
Viscosity  mPa*s   max. 100  

at 25 °C in 10 % aqueous suspension  
pH Value   5.5 - 7.5  

Potentiometry in 10 % aqueous suspension; (11/12)  
Solubility in Water  % (w/w)   max. 0.5  

Gravimetry after filtration of a 10 % aqueous suspension at 25 °C; (11/41)  
Acid Number  mg KOH/g   max. 1  

Titration using alkali in 10 % aqueous suspension; (11/11)  
Decomposition Temperature  °C   > 275  

Initial evolution of ammonia  
Average Particle Size (D50)  µm   approx. 17  

 
Particle Size Distribution  % (w/w)    

Air jet sieving; (11/02)  
 > 100 µm   max. 0.2 (DS)      
 < 50 µm   min. 95 (TD)      
Weight Loss  % (w/w)    

 
 350 °C   approx. 5      
 450 °C   approx. 10      
 550 °C   approx. 20      
¹) Delivery specification: The product is monitored on a regular basis to ensure that it adheres to the specified values. Test methods: Clariant method numbers 11/xx in brackets.
²) Technical data: The technical data are used solely to describe the product and are not subject to regular monitoring.  
Intumescent coatings
On account of its low water solubility, Exolit AP 422 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, 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 422 based intumescent coatings on wood or plastics enables these materials to qualify for Building Material Class B (DIN EN 13501-1).

Exolit AP 422 imparts a good flame-retardant effect to adhesives and sealants when it is incorporated into the base formulation at the rate of 10 - 20 %.

Polyurethane foams
Exolit AP 422 is a suitable non-halogenated flame retardant for polyurethane foams. If handling of Exolit AP 422 as a solid is not possible we recommend the dosage of the flame retardant by preparing an Exolit AP 422/polyol-suspension. Because of the low acid number of Exolit AP 422, it is also possible to incorporate this flame retardant in an Exolit AP 422/isocyanate suspension.

To prevent the solids from settling, the Exolit AP 422 suspensions should be stirred or circulated by pump. The stirrers commonly found in service tanks are adequate for this purpose. 

Other applications
Exolit AP 422 has an excellent flame-retardant effect in cellulose-containing materials such as paper and wood products. With chipboard products, the DIN EN 13501-1 classification can be achieved by adding 15 - 20 % Exolit AP 422.

Because of its high heat stability, Exolit AP 422 is an essential component in intumescent formulations for thermoplastics, particularly polypropylene, for which the classification UL 94-V0 is specified for applications in the electrical sector.

Casting resins and composites based on epoxy resins or unsaturated polyester resins achieve the classification UL 94-V0 with Exolit AP 422. Combinations of AP 422 with ATH show synergistic effects in UL94 and LOI tests.
Delivery form
White powder

Packaging
Exolit AP 422 is packed in 25 kg 4-ply paper bags with polyethylene inliner. The standard supply unit is a shrink-wrapped pallet with 40 bags weighing 1000 kg net. Exolit AP 422 can also be supplied in a variety of big bags, shrink-wrapped.

Storage
Minimum shelf life is 12 months from the date of shipping when stored according to the said conditions.
Products that offer outstanding sustainability advantages are awarded Clariant’s EcoTain® label. EcoTain® products significantly exceed sustainability market standards, have best-in-class performance and contribute overall to sustainability efforts of the company and our customers. Find out more about: EcoTain®.
PeoplePEOPLE
PeopleSAFE USE, TRANSPARENCY AND INFORMATION
  • Non hazardous, studies on life cycle data available
PeopleADDRESSING MEGATRENDS AND SOCIETAL NEEDS
  • Saves lives and assets as a (halogen free) flame retardant
PeoplePLANET
PeopleRAW MATERIALS AND SUSTAINABLE SOURCING
  • Phosphorus is on the EU list of critical raw materials, however, recycling is possible and actively investigated
PeopleRESOURCE EFFICIENCY AND ENVIRONMENTAL PROTECTION
  • High material efficiency and minimized waste in production through recycling of raw materials
PeoplePERFORMANCE
PeopleINTEGRATED SUSTAINABLE BUSINESS
  • Joint developments with customers on formulations

 

 

 

PeoplePERFORMANCE ADVANTAGES
  • Constant high quality and hydrolytic stability
  • Supports the attainability of eco-labels for customer products
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