... 33*10-10Pa.cm3/sec The vacuum bellows are widely used in following industries:vacuum,photovoltaic,semi-conductor,pharmacy,food, ... etc.The vacuum bellows features: 1) Absorbs thermal expansion and shock 3) Structure: bellows + flat welding flanges 4) Main ... material, bellows : stainless steel 304; flanges: stainless steel 304 or carbon stee ...