Applications On account of low water-solubility, APP-II is specially suitable to be used as acid source for intumescent coatings. Intumescent coatings on the steel structure can meet the requirements the DIN4102 fireproofing grade. For polyurethane foams, APP-II is a suitable halogen-free flame retardant. APP-II has an excellent flame retardant effect in the fibre base material such as paper and wood products. Adding 15-20% APP-II to Casting resins based on epoxy resins or unsaturated polyester resins can reach UL 94-V0 grade. Safety and toxicity Acute oral toxicity LD50 (rat): â?¥2000mg/kg LD50 Storage: Dry, at room temp. Packing 25kg / bag, paper bag lined with PE bag or as customerâ??s requirements