Polypropylene burning tests

Miyata and co-workers have examined the effect of magnesium hydroxide on the flammability of polypropylene, using the UL94 vertical burn test [33]. They found that the performance again increased with decreasing effective particle size and that levels of about 58% w/w were needed to achieve rating at 0.3 cm thickness. The rate of change was very steep below this filler level. 

Artificial surfaces must be resistant to cigarette bums, vandaUsm, and other harm. Fire resistance is most critically evaluated by the NBS flooring radiant panel test (10). In this test, a gas-fired panel maintains a heat flux, impinging on the sample to be tested, between 1.1 W/cm at one end and 0.1 W/cm at the other. The result of the bum is reported as the flux needed to sustain flame propagation in the sample. Higher values denote greater resistance to burning results depend on material and surface constmction. Polypropylene turf materials are characterized by critical radiant flux indexes which are considerably lower than those for nylon and acryflc polymers (qv) (11). 

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