Form This specification covers extruded polytetrafluoroethylene (PTFE) in the form of flexible tubing. Application This tubing has been used typically for electrical insulating sheath up to 500 ??(260 ??@ but usage is not limited to such applications. Safety - Hazardous Materials While the materials@ methods@ applications@ and processes described or referenced in this specification may involve the use of hazardous materials@ this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.