WebHDPE Sheet - White, Black, or lor - iPolyHDPE sheet expands more in length than in width, due to its molecular structure. The easiest formula to use for an exact expansion / n. Home » News » 2 lor HDPE sheets » anti-uv orange on black Two-Tone HDPE Sheets for outdoor. anti-uv orange on black Two-Tone HDPE Sheets for outdoor . HDPE ...