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China Factory Industrial Gas Un1005 Industrial Grade 99.8% Purity Nh3 Gas Ammonia Refrigerant R717, Find Details and Price about Industrial Gases Ammonia Nh3 from China Factory Industrial Gas Un1005 Industrial Grade 99.8% Purity Nh3 Gas Ammonia Refrigerant R717 - Chengdu Hongjin Chemical Co., Ltd.