2 inch thick high quality rigid polyethylene sheet for Storage High Density Polyethylene Sheets, .031 to 4.00 Inch Thick 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.