supply of carbon dioxide (co2) as shielding gas for metal arc welding (gmaw) as per is:307/1996 (reaffirmed 1996) cylinder capacity 31 kgs. each purity 99.8% maximum moisture content 32 ppm special condition minimum validity period of supply should be 2 (two) years from the date of issue of purchase order. (hsn code 28112190)carbon dioxide (co2) as shielding gas for metal arc welding (gmaw) as per is:307/1996 (reaffirmed 1996) cylinder capacity 31 kgs. each purity 99.8% maximum moisture content 32 ppm special condition minimum validity period of supply should be 2 (two) years from the date of issue of purchase order. (hsn code 28112190),carbon dioxide (co2) as shielding gas for metal arc welding (gmaw) as per is:307/1996 ( reaffirmed 1996) cylinder capacity 31 kgs. each purity 99.8% maximum moisture content 32 ppm special condition minimum validity period of supply should be 2 (two) years from the date of issue of purchase ord er. (hsn code 28112190) [ warranty period: 30 months after the date of delivery ] ]