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 ) .Old Pl ( 81989120, 81988813 ) As Per Drg.No. Is No-307 / 66, 2Nd Revision Reaffirmed-2006 Specn: Carbon Dioxide Gas ( Co2 ) [ Warranty Period: 30 Months After The Date Of Delivery ]