Bids are Invited For 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) in Assam