Various plastics and elastomers were evaluated for flash-fire propensity, using the USF flash-fire screening test method. The test results were compared with those obtained with the NBS and Douglas test methods. Polyurethane flexible foams were among the materials exhibiting the greatest flash-fire propensity in all three tests, and polychloroprene flexible foams were among the materials exhibiting the least flash-fire pro pensity in the USF and Douglas tests. The materials that appeared to be the least prone to flash fires included polyvinyl chloride, polyphenylene oxide and sulfide, polyether and polyaryl sulfone, and polychloroprene, polyphosphazene, and silicone flexible foams.
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