Sulfur hexafluoride ( SF6) is a colorless in-noxious and non-flammable gas at atmospheric temperature. For it excellent insulation, SF6 is widely used in electrical industries, such as circuit breaker, high-voltage transmission line, CIS, large cable coil, mutual inductor, lightning arrester, etc Item Unit SF6 % ( m/ m) > = 99.99 Air( O+ N) % ( m/ m)