PE, a kind of thermoplastic resin prepared by the polymerization of ethylene. Soft to the touch, with a certain degree of transparency can be used repeatedly, health non-toxic, environmental protection, moisture-proof, waterproof and dustproof, mouldproof. Flat shaped pockets are widely used in electronics, instruments, ceramics, handicrafts, household appliances, auto dealers, kitchen, furniture, hardware tools products, glass products and precision instruments, and other seismic buffer, protective packaging. Can prevent the transfer process of the extrusion, vibration and friction, for fear of squeezing articles have a certain protective effect.