Ammonium Polyphosphate (APP)

CAS# 68333-79-9

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Property

  • Appearance
  • Phosphorus Content
  • Nitrogen Compounds (as N)
  • Moisture
  • pH
  • Solubility in Water
  • Decomposition (typical)
  • Average Particle Size
  • Viscosity

Unit

  •  
  • %
  • %
  • %
  •  
  • %
  • °C
  • μm
  • mPa

Specification

  • White Powder
  • 31.0-32.0
  • 14.0-15.0
  • 0.25 Maximum
  • 5.5-7.5
  • 0.5 Maximum
  • 260 Minimum
  • ~15
  • 50 Maximum

Application

Ammonium Polyphosphate (APP) is a non-halogen flame retardant which acts by an intumescence mechanism. When APP is exposed to fire or heat, it decomposes to polymeric phosphate acid and ammonia. The polyphosphoric acid reacts with hydroxyl groups to form a nonstable phosphate ester. Following dehydration of the phosphate ester, a carbon foam is built up on the surface and acts as an insulation layer.
APP is used in plastics such as PP, PVC, PE, polyester, rubber, and expandable fireproof coatings.

Packaging

Ammonium Polyphosphate (APP) is available 25 kg bags, palletized.

Synonyms

Phosphoric acid, ammonium salt (1:3), Triammonium orthophosphate, triazanium;phosphate, Ammonium phosphate, tribasic

Molecular Formula

H12N3O4P

Market Segment

Agriculture, Adhesives, Cements, Plastic, Textile, Water Treatment

Product Uses

Fertilizer, Flame Retardant, pH Control, Polyurethane Foam