Industrial steel/aluminum cylinders are mainly used for storage and transportation of high-purity gases such as firefighting gases, industrial gases, electronic specialty gases (such as oxygen, nitrogen, hydrogen, argon, carbon dioxide, natural gas, ethane, silane, sulphur hexafluoride, carbon tetrafluoride and gas mixtures). These cylinders are widely used in the fields of industry, agriculture, food, pharmaceuticals, sanitation, firefighting, aviation, scientific research, natural gas automotive, and etc..