grey HDPE board 20mm application-- Cus-to-size HDPE sheets FDA 21CFR177.1520 Sec. 2.1, ASTM D4976, PE244, ASTMD1248 Type IV, Class A, Fed Spec LP512, Type 1, Class H, Grade 5; HDP . 6mm matte hdpe polythene sheet for Round Yards. HDPE Sheet. High density polyethylene sheet is a tough material with a high impact strength.