MCA®AP-PPMT 770 is a "Ready-to-Use" synergistic blend of ammonium polyphosphate with the proprietary1) polymeric, halogen-free nitrogen synergist MCA® PPM-Triazine HF and an additional carbon-booster for fire retardation by intumescence; derived from phosphorus nitrogen synergism. In the event of fire the plastic material containing such a fire retardant system foams, cross-links and forms a solid char at the surface acting as a fire shield. The protective layer also imparts a heat-insulation effect, reduces oxygen permeability and prevents dripping of molten polymer, if and wherever it can occur. Such systems are also characterized by low smoke density, and low toxic fumes.

MCA® AP-PPMT 770, containing inert large molecular weight MCA® PPM-Triazine HF, is particularly recommended where state-of-the-art commercial blends of ammonium polyphosphate with small molecular weight nitrogen synergists fail either in processing or in performance such as due to sublimation, liberation of toxic ammonia by self-condensation, mould deposits, and plate-out from or interaction with the polymer itself.

Ref. 1 : European (and World-Wide) Patent Application Nrs. EP 08008717.4 and EP 08015381