2 inch thick high quality rigid polyethylene sheet for Storage Polyethylene 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 HDPE Sheets Technical Data Sheet. HDPE Sheets Chemical Resistance **Denotes HDPEps by Motor Cargo.