Sealing: pressure applied 50Kpa ensure one minute, no dripping, no displacement. Explosion: the argon mixed with 32% doing booster test, the results are not booster. Dielectric strength: the sample into the test piece pressure 2.5 mm thick, 4KV AC voltage, 1 minute not breakdown. Flammability: clay with bright fire, slow fire. Oil resistance: No. 68 oil soaked in a month, not dispersed, no deformation. Color: deep black shiny.