Polyurethane component parts are used by the bulk mailing and other fields because polyurethane is superior to other materials such as plastic, rubber and steel. Molded polyurethane parts offer high load and high compression abilities that function long after rubber and plastic parts have failed. Cast polyurethane parts can be made iron-strong or sponge-soft, in any color or shape. In addition, polyurethane components offer long run durability and extreme resistance to harsh environments of water, heat, solvents, chemicals and abrasion.