The Cylinders can be used to store and transport permanent gases and high pressure liquefied gases.The gases have the chemical stability for aluminium-alloy.They are widely used in the fields of industry,medical equipment,researching and so on.The Cylinder 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 rare,high purity and standard gases.