UL 1321 OUTLINE

Description / Abstract: 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.