Form This specification covers virgin@ unfilled polytetrafluoroethylene (PTFE) in the form of extruded rods@ tubes@ and profiles. Application These products have been used typically for parts@ such as seals@ back-up rings@ and bearings@ requiring chemical inertness and dimensional stability up to 500 ??(260 ?? and better mechanical and/or electrical properties than AMS3656@ but usage is not limited to such applications. Classification Extrusions are classified as follows: Type 1 Parts requiring dielectric strength test (3.2.4) and radiographic inspection (3.3.1). Testing of all other specified properties is required. Type 2 Parts requiring radiographic inspection (3.3.1) but where electric insulation is not important. Dielectric strength test (3.2.4) is not required. Unless a specific type is ordered@ Type 1 shall be supplied. 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.