This specification covers low@ medium@ and high density polyethylene and copolymers molding and extrusion material for general purpose use@ for use as dielectric material@ and for weather-resistant applications. For the purpose of this specification@ the term polyethylene is used when referring to any of the types@ classes@ grades@ and categories. Coverage: This specification does not cover all the types@ classes@ grades@ and categories of polyethylene@ but only those that are most generally used by the Federal Government. Classification: Types@ classes@ grades@ and categories (see table III): Polyethylene shall be of the types@ classes@ grades@ and categories as specified.