These requirements are for use in the investigation of polytetrafluoroethylene plastic in the form of tape with a minimum width of 1/2 inch (12.7 mm)@ or in the form of cord@ where the product is intended to make threaded metal pipe joints tight against leakage. These products are evaluated when applied in accordance with the manufacturer's instructions@ to male threads of metal pipe assemblies. The products are rated for use in equipment intended to handle gasoline@ gasoline/ethanol blends@ diesel fuel@ biodiesel/diesel fuel@ biodiesel@ naphtha@ benzene@ kerosene@ petroleum oils@ natural gas@ propane@ or butane as specified by the manufacturer. This outline of investigation does not cover the classification of the product in regard to its flammability@ the toxicity of the product or its vapors due to flammability@ or the effect of normal atmospheric conditions on the product while in storage or in use. If requested@ tape narrower than 1/2 inch (12.7 mm) or the sealing of threaded joints in pipe sizes larger than 1-1/2 inches may be investigated using appropriate adaptation of tests described in Sections 7- 9. Tests for uses other than those indicated are not within the scope of these requirements.