METHOD FOR IMPROVING FIRE RESISTANCE OF POLYETHYLENE TUBING AND POLYETHYLENE TUBING MANUFACTURED ACCORDING TO SAID METHOD

摘要

A method for improving the fire resistant qualities of polyethylene and high density polyethylene including the steps of (a) applying to a solid polyethylene substrate, a liquid composition including effective amounts of a monomer, prepolymer, a graft initiator, a catalyst and a polymerization promoter, under conditions effective to promote grafting of the monomer or prepolymer to the solid polyethylene substrate to form a coating on the substrate, (b) applying fiberglass on top of the coated substrate, (c) applying additional liquid composition of the type described in step (a) on top of the layer of fiberglass applied in step (b), and (d) curing the applied composition. The invention also relates to a polyethylene substrate manufactured according to the method.