Product Name: High Pressure Good Quality Gas Nitrous Oxide (N2O) Model NO.: ISO219-40-150 Water Capacity: 40L Cylinder Material: 37mn Cylinder Standard: ISO9809-3 Height: 1330mm Working Pressure: 150bar Test Pressure: 250bar 20FT Container: 350PCS Weight: 47 to 50kg Valve: Qf-2c Material: Steel Trademark: DSW Transport Package: Box Specification: iso9809-1, TPED Origin: China HS Code: 73110090 Product Description 40L CylinderValve: QF-2CVolume: ~40LDiameter: 219 MmWorking Pressure: 150 BarTesting Pressure: 250 BarColor : blue since 2010, we produce the following gas: 99.999% and 99.995% helium were 99.9% and 99.999%, 99.9% and 99.999% of the laughing gas, the carbon monoxide were 99.9993% and 99.999%, 99.9993% and 99.999% of argon gas, and 99.995% hydrogen, 99.995% and 99.999% nitrogen, 99.999% and 99.99% were 99.999% and 99.995% and 99.999% of carbon dioxide, methane, 99.999% and 99.998%, and 99.999% of the oxygen, or more than 99.9% of acetylene, and so on.2. Before filling: heating with the first step of the cylinder, the second step is to dry the moisture inside the cylinder, the third step to open the cylinder calabash valve pumping air into vacuum state, the fourth step play 0.3 to 0.5 mpa raw material gas chromatography to test, test impurities, this step is to test both sides can enter the next step aeration process.So far our products are enjoying good markets at home and exporting to European and American countries, the Middle East countries, West Asia, as well as South and East Asia countries.