Shop for Pipe Grade HDPE sheets. Pipe grade HDPE sheet is a UV stabilized material that is easy to fabricate and weld using thermoplastic welding equipment and is an excellent choice for fabricated water tanks and chemical tanks. Custom cuts and cut-to-size pieces. Have machined into fabricated parts. HDPE comes in many colors. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.