... 500bar Certificate: T PED, TUV,DOT The Seamless Aluminum Alloy Gas Cylinder was applied in the industry of chemical, electronic, medical, ... food and beveragem,etcThe Seamless Aluminum Alloy Gas Cylinder is made of superior quality aluminum alloy 6061 and manufactured ... the inner surface, etc. It is used to be filled and refilled various kinds of gas, such as rare gases, high ...