... be used for keep fresh of fish. 99.5% industrial CO gas and other gas specification: Product nameTechnical index(%) StandardUnitApplicationIndustrial ... , leak testing, floating balloon.Dissolved acetylene ≥98GB6819-1996CylinderWelding, cutting, heating, organic raw materialsPropylene ≥99.5Q/DY-98KgWelding, cuttingPure Gases,High ... ScopeHeN28-55%HeCO22-16%HeH2 0.25-0.45% CO 2-6%CO2 2-16% N2 8-25%HeCO ...