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Chongqing Tonghui Gas Co ., Ltd was established in 2007 . The headquarters is located in Tongnan District, Chongqing and has 15 subsidiaries. Its business covers the R&D , production and sale of food/industrial grade liquid carbon dioxide , food grade carbon dioxide filing vial, dry ice , high-purity carbon dioxide ,food grade and electronic nitrous oxide , electronic grade special gases and relevant products. The annual output of liquid carbon dioxide is 1 , 100 ,000 tons, nitrous oxide (N20 ) is up to 60 ,000 tons,high - purity and electronic grade Germane reaches 2000tons. We provide food grade carbon dioxide for the market of carbonated beverages and provides high - purity electronic gases for the market of semi conductor, LED , LCD and PV . We also have 60 special transport tankers for low temperature liquid carbon dioxide and special vehicles for dangerous chemicals. our product have been exported to many countries and regions, including Southeast Asia , Europe , America and Middle East. Our production capacity is leading in the gas indiustry in West China , ranking the top in the country.We have obtained ISO9001 :2008 Quality Management System Certification ,ISO14001 :2004 Environmental Management System Certification ,OHS 18001:2001 Occupational Health and Safety Management system Certification and ISO 22000 Food Safety and Quality System Certification .