High-density polyethylene (HDPE) or polyethylene high-density (PEHD)'s a polyethylene thermoplastic made from petroleum. It takes 1.75 kilograms of petroleum (in terms of energy and raw materials) to make one kilogram of HDPE. HDPE's commonly recycled, and has the number "2" as its recycling symbol. In 2007, the global HDPE market reached a volume of more than 30 million tons. Properties HDPE has little branching, giving it stronger intermolecular forces and tensile strength than lower-density… (More on Hdpe)