This specification covers co extruded composite drain, waste, and vent pipe (DWV). The pipe is produced in Schedule 40 IPS sizes by a co extrusion die system, in which the concentric layers are formed and combined before exiting the die. Coextruded composite drain, waste, and vent pipe, DWV, by definition, is permitted to be produced with two or more layers. The outer layer shall be ABS. The middle layer is permitted to be thermally foamed PVC or solid PVC or a blend of rework material, as specified. The inner layer is permitted to be solid PVC or ABS, or a blend of rework material as specified. The basic material used for pipes is a virgin compound which is used in the outer layer of co extruded composite drain, waste, and vent pipe or (DWV). It shall contain pigments or screening agents to provide protection against UV radiation. Different tests and measurements shall be conducted in order to determine the following properties of pipes: outside diameter, wall thickness, length, pipe flattening, pipe stiffness, impact strength, and bond. The inside and outside surfaces of pipe produced shall be free of chalking, sticky, or tacky material. The surfaces shall be free of excessive bloom. Bloom or chalking may develop in pipe exposed to direct rays of the sun (ultraviolet radiant energy) for extended periods and consequently, these requirements do not apply to pipe after extended exposure to direct rays of the sun. The inside and outside surfaces of pipe shall be free of foreign inclusion or other defects that re visible to the naked eye, and may affect the wall integrity.
This specification covers co extruded composite drain, waste, and vent pipe (DWV). The pipe is produced in Schedule 40 IPS sizes by a co extrusion die system, in which the concentric layers are formed and combined before exiting the die. Coextruded composite drain, waste, and vent pipe, DWV, by definition, is permitted to be produced with two or more layers. The outer layer shall be ABS. The middle layer is permitted to be thermally foamed PVC or solid PVC or a blend of rework material, as specified. The inner layer is permitted to be solid PVC or ABS, or a blend of rework material as specified. The basic material used for pipes is a virgin compound which is used in the outer layer of co extruded composite drain, waste, and vent pipe or (DWV). It shall contain pigments or screening agents to provide protection against UV radiation. Different tests and measurements shall be conducted in order to determine the following properties of pipes: outside diameter, wall thickness, length, pipe flattening, pipe stiffness, impact strength, and bond. The inside and outside surfaces of pipe produced shall be free of chalking, sticky, or tacky material. The surfaces shall be free of excessive bloom. Bloom or chalking may develop in pipe exposed to direct rays of the sun (ultraviolet radiant energy) for extended periods and consequently, these requirements do not apply to pipe after extended exposure to direct rays of the sun. The inside and outside surfaces of pipe shall be free of foreign inclusion or other defects that re visible to the naked eye, and may affect the wall integrity.
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