A flammability test for dielectric fluids

A modification or the Cleveland Open Cup Test, ASTM D92, was developed for dielectric fluids in non-fire hazard power capacitors and transformers. This was on the basis of considering fire situations in these apparatus. Two criteria for non-flammability were deduced and applied in this test: that burning may only be initiated at the boiling point, and that burning cease on cooling when separated from the heat source. A number of fluids were tested. Effects of soot are noted.