Abstract: Cross-linked thermoplastics articles are fabricated by providing a radiant energy-crosslinkable thermoplastics sheet, masking areas of the sheet, exposing the masked sheet to appropriate radiant energy, fusing the masked and relatively uncrosslinked areas together under heat and pressure, and locally applying crosslink inducing energy to the fused portions.

Abstract: A method of thermally insulating pipe comprises rotating the pipe at a uniform speed about a substantially horizontal axis while applying a polyurethane foam mix to the surface of the pipe progressively along its length, simultaneously forming a metal tube of larger diameter than the pipe, the tube being progressively extended coaxially with the pipe and progressively enveloping the newly coated surface of the pipe, and maintaining the pipe at a temperature at which the mix constituents will react to form a foamed mass enveloping the pipe and filling the space between the pipe surface and the tube.