Melapur Melamine polyphosphate

Melamine polyphosphate Melapur 200 Ciba (Switzerland) PA66/glass fibers, epoxies, synergistic blends with other flame retardants... 

Melamine cyanurate in combinatimi with magnesium hydroxide (Mg(OH)2 or MH) or even with talcum (Japanese patents), melamine polyphosphate (DSM, type Melapur 200), also suitable for PA 6.6 GF, are two examples of more recent developments. Zinc sulfide can replace antimony trioxide in some cases. 

A small amount of Melapur 200 (melamine polyphosphate) with a metal hydrate leads to a strong reduction in the rate of heat release. The combination allows a lowering of the loading to 50% instead of 65% and still retains the same peak rate of heat release as with 65% magnesium hydroxide in EVA. The effect of Firebrake ZB has been shown to further reduce the overall level of heat release and create a hard, cellular protective structure. In vertical bum tests like UL94, however, this stmcture is not created and leads to a loss of classification. Current work is endeavouring to improve vertical burning behaviour of these formulations. 

A more recent member of this family is melamine polyphosphate (MELAPUR 200, originally from DSM, now from Ciba), which has a thermal stability advantage for use in polyamide 6 and 66 (61) and in combination with char-assisting additives, in polyolefins such as those used for stadium seating. 

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