عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Abstract : polyolefins are The most important polymer in the production of pipe &fittings industry. Properties and specifications of plastics - particularly polyethylene - has increased trends of their usage in industry only in short time after their production. The use of polyethylene has been a growing in Piping systems for water supply, for drainage and … in recent years. Naturally, this growth will continue, if the new technologies in materials, processes, and methods are used in production and installation of this pipes and their fittings. Different grades of polyethylene materials are based on the type, Application Temperature and hydrostatic pressure tolerate comes from the changes in density of components blend or method of processecing for Resolving any problems of Previous types.
In this paper, introduced the Process of evolution, characteristics of this modified type,their advantage, methods of production and evaluation of the product of this material is based on existing standards.