... a packaging material . Polyethylene foam is also a durable, lightweight, resilient, closed-cell material available in a wide range ... -free and ozone friendly, recyclable, odorless, and very lightweight. Many types of polyethylene are approved for use in ... ceilings, structural glazing.SportsWrestling, judo, gymnastics, taekwondo, and jogging exercise mats. Leg and thigh guards, arm elbow/shoulder pads ...