supply of calibration gas mixture (standard gas). , calibration gas mixture (standard gas) in 500ml cylinder aluminium can contains 10 litres of available ga s with following compositions. 1) 1000 ppm - methane, 2)1000 ppm-ethane, 3) 1000 ppm -ethylene, 4) 1000 ppm -acetyl ene, 5) 1000 ppm-hydrogen, 6) 5000 ppm - carbondioxide, 7) 5000 ppm -carbonmonoxide, 8) balance -nitrogen. the ga s filling pressure must be 20 kg./sq.cm. makes: spantech or its equivalent. note:[1] firm shall supply aluminum cylinder cans, each with a capacity of 500ml. [2] firm shall quote any one make for the tendered description, if vendor offers/bid s for more than one make or if the firm mentions, as per tender in their bid(s), their offer will be summarily rejected. [3 ] gas composition and gas quantity certificate must be provided along with the supply of the material. [ warranty peri od: 30 months after the date of delivery ] ]