High Pressure Seamless Aluminum Alloy Gas Cylinders cab be used to store and transport gases which have the chemical stability for aluminum-alloy, such as permanent gases and high pressure Liquid Gas. They are widely used in the fields of industry, medical equipment, researching and so on. The Cylinders is formed by back extrusion and drawing, processed by cold rolling. Inner surface is anodized and has perfect chemical stability and smooth, suitable for filling gases of high purity and standard gases.