Used in a variety of industries, PE foam materials are created by introducing gas into polyethylene and allowing it to expand. This produces a cellular structure which determines the physical properties of the PE foam. PE foam can be produced to be open or closed cell. Open cell PE foam is used to produce cushioning in apparel and sporting equipment, as closed cell PE foam is less breathable and is used for moisture protection and buoyancy in life jackets and other floation devices. PE foam materials are chemically and thermally stable, and have low thermal conductivity. Because of these properties, PE materials are used for insulation in the construction and other industries. PE foam materials also possess good acoustic absorption and dampening properties. PE materials are good candidates for improving the energy efficiency of buildings. PE foam materials can be manufactured with improved properties through modification of the polyethylene base. These modifications can provide PE materials with flame retardant properties, anti-static and other electrical properties. Other modifications can reduce the UV transmission and absorption of PE materials.