Reference Standard Polyethylene Resins and Piping Materials. Final Report October 1, 1985-September 30, 1986

摘要

Polyethylene piping is currently in widespread use in gas distribution in the United States, and represents approximately 80% of new installation, Research that is currently being performed on gas pipes often employs many different polyethylenes selected from the large number of polyethylenes available for this use. The variation in materials makes it difficult to compare results from different research laboratories, or to compare measurements carried out in the same laboratory at different times. To avoid this difficulty Gas Research Institute and the National Bureau of Standards (NBS) have undertaken to provide a permanent store of one particular polyethylene resin as well as piping and fittings made from it which would provide a source of well characterized materials for research related to gas distribution systems. The report describes the choice of this resin and the types and quantities of the materials to be provided by NBS and the characterizations performed which include the determination of the branch content, melt flow rate, molecular weight and molecular weight distribution, density, and specific tensile properties.