ENGINEERING THERMOPLASTIC-LINERS

摘要

HDPE liners have been advantageously installed and used for many years now. Due chiefly, to permeability and chemical resistance problems, however, HDPE liners are limited in hydrocarbons and high temperature service. Other exotic materials have sometime become a very expensive choice, but the market steel needs a cost effective solution. Recent developments in the extrusion technology can now offer viable alternatives to HDPE and engineering thermoplastics. Swelling and plasticization due to hydrocarbons can be controlled through the use of multi-layer structures. High temperature applications can be effectively addressed through the use of engineered formulations of silane based cross-linked polyethylene (PEXb) which allow the production of fusible liners. Both multi-layer and PEXb liners can be installed using conventional HDPE equipment. In fact these new technologies are effectively creating new classes of engineering liners able to fill the gap between low price commodity polymers and expensive engineering thermoplastics.