About high density polyethylene; High density polyethylene weighs 0.96 gram per cubic centimeter or 960 kilogram per cubic meter, i.e. density of high density polyethylene is equal to 960 kg/m³.In Imperial or US customary measurement system, the density is equal to 59.93 pound per cubic foot [lb/ft³], or 0.555 ounce per cubic inch [oz/inch³] .;