Exolit® AP 420
Aqueous solution of ammonium polyphosphate (APP).

Exolit® AP 420

Aqueous solution of ammonium polyphosphate (APP).

Edition Date :
October 01, 2020

Exolit AP 420 is an approx. 45 % clear to cloudy aqueous solution of a short-chain ammonium polyphosphate.

  • Suitable as flame retardant for wood, paper and textiles
  • Non-halogenated flame retardant with favorable environmental and health profile


For regulatory details such as the classification and labelling 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

Phosphorus  % (w/w)   12.5 - 13.5  

Photometry after oxidizing dissolution; (11/17)  
Water / Moisture  % (w/w)   53.5 - 56.5  

Karl-Fischer titration; (11/21) (DIN 51,777)  
Nitrogen  % (w/w)   min. 9  

Density  g/cm³   1.29 - 1.31  

at 20° C, flexural resonator acc. to DIN 51,757-4; (11/65)  
Viscosity  mPa*s   max. 100  

at 20° C  
pH Value  % (w/w)   5.0 - 7.5  

Potentiometry at 20° C; (11/12)  
¹) Delivery specification: The product is constantly monitored 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.  
Exolit AP 420 is a suitable flame retardant for wood, paper and textiles.   
Delivery form
Clear to cloudy aqueous solution

Exolit AP 420 is dispatched in 150 l-PE hobbock/drums (180 kg net).

At temperatures between 10 and 25 °C Exolit AP 420 is stable for about 12 months. We recommend stirring the material before using it.
Exolit AP 420 can be carefully warmed up under stirring to 30°C to gain a clear solution.

Minimum shelf life is 12 months from the date of shipping when stored according to the said conditions.

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Alexis Dudley
Alexis Dudley
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This information corresponds to the present state of our knowledge and is intended as a general description of our products and their possible applications. Clariant makes no warranties, express or implied, as to the information’s accuracy, adequacy, sufficiency or freedom from defect and assumes no liability in connection with any use of this information. Any user of this product is responsible for determining the suitability of Clariant’s products for its particular application.<br />
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