1.5 inch INDUSTRIAL hdpe pad-HDPE sheets 4×8, Custom HDPE High Density Polyethylene (HDPE) Sheet. This sheet can be heat formed, shaped, and welded to fabricate ducts, hoods, and much more. The material cannot be cemented, but it is easily welded with a plastic welder. Get Price 1.5 inch thick NSTRUCTION hdpe pad-HDPE sheets 4×8, Custom