Supply Of Carbon Dioxide Gas For Welding Specn No.Is:307 / 1966. Grade-I And Co2 Purity Minimum 99.98 / 99.9% Volume ( Fertiliser Quality ) . As Per Drg.No. Is No-307 / 66, 2Nd Revision Reaffirmed-2006 Specn: Carbon Dioxide Gas ( Co2carbon Dioxide Gas For Welding Specn No.Is:307 / 1966. Grade-I And Co2 Purity Minimum 99.98 / 99.9% Volume ( Fertiliser Quality ) . As Per Drg.No. Is No-307 / 66, 2Nd Revision Reaffirmed-2006 Specn: Carbon Dioxide Gas ( Co2, Carbon Dioxide Gas For Welding Specn No.Is:307 / 1966. Grade-I And Co2 Purity Minimum 99.98 / 99.9% Volume ( Fertiliser Quality ) . As Per Drg.No. Is No-307 / 66, 2Nd Revision Reaffirmed-2006 Specn: Carbon Dioxide Gas ( Co2