Some of the company developed a kind of silicone rubber sealing material. The seal material by aluminum foil layer, resin, fiberglass fabrics cloth layer and silicone rubber layer upon layer, it has very good flexibility and resilience, even twisted bent 180 degrees or 180 degrees will not delamination or cracking. In addition, for this kind of sealing material is also very good, so can also be used as a lining materials. A Japanese company developed a kind of excellent drawability of packing materials. The packing material by nitrile rubber, glass fiber, aramid fiber, etc, its thermal performance and strength performance is also very good.