Dripstops 920, 940; Nuts N' Bolts 427; Self Seelers 604, 615, 616, 618:

Grade numbers 920, 940, 427, 604, 615, 616 and 618 have been tested and classified by Underwriters Laboratories Inc. as to fire hazard only: Fire hazard is small; No flash point in liquid state; Ignition temperature 837°F (447°C). Suitable for use in devices handling gasoline, petroleum oils, natural gas (pressures not to exceed 300 psig), propane, and butane. 29R9 Reference: Underwriters laboratory File Number MH14222.