... for the supplying various kinds of high and low pressure gas cylinders with pressure level B1,B2,B3,A1,C3,D1,D2 ... . These cylinders are used to fill with permanent gases, liquefied petroleum gas or compressed natural gas to serve a wide application in chemical ... BS, JIS, DIN, EN, KS, ISO, GB(China) or the off-standard from the consumer. All the manufacturing technology and propertiess ...