... gas cylinder is made to fill with various kinds of low pressure liquid gases for industrial use. Liquid gas ... petroleum industries, electronic industry, building industry and in the fields of fire fighting, energy, food process, household, medical treatment, cryogenic soldering ... diving, mining,scientific research & etc.Presently we have the approvals of DOT, TUV, CCS, BV, ABS, TC,& LIOYGS. These ...