It is a tube form composed of fine weave woven glass reinforcement combined with a silicone resin system. RT507L meets the requirements of MIL-I-24768/17, Type GSG. The product is designed for exposure to arc, flame, or excessive heat in electrical applications that require fine machining. RT507L is suitable for rings, collars, inserts, spacers, bushings, insulators, and welding tips. All of the RT507L tubes are individually tested for leaks and are guaranteed leak proof.