1.1 This specification covers coextruded composite pipe, produced by a coextrusion die system, in which the concentric layers are formed and combined before exiting the die. 1.1.1 Materials listed in the material sectio This specification covers coextruded composite pipe, produced by a coextrusion die system, in which the concentric layers are formed and combined before exiting the die. Coextruded composite pipe conforming to the requirements prescribed are used for d