High Density Polyethylene. HDPE is more rigid and harder than low density materials and is three times better in mpressive strength. HDPE mplies with FDA requirements for direct food ntact applications. It is also accepted by USDA, NSF and Canadian Department of Agriculture. FDA 21CFR177.1520 Sec. 2.1, ASTM D4976, PE244, ASTMD1248 Type IV