Due to the low temperature of liquid helium, liquid helium cooling helium certain metals or metal compounds, metal or metal compound of resistance will disappear completely, a phenomenon known as superconductivity, this temperature is called the critical temperature. Because helium spread to almost three times the speed of sound in air, so people inhale helium voice becomes high frequencies. This interesting is like, so that the suction speak helium gas helium offer fine whine, just like the old cartoon characters like. Chemical properties of helium gas is a single atom, chemically inert. Helium generally do not form compounds, in the low pressure discharge tube may be formed by the excited He + 2, HeH plasma and molecules. 1, condensation: mention helium gas condensation method using the pretreatment processes include the purification of natural gas, crude helium and helium preparation step of helium and other production in the refining industry to prepare 99.99% pure helium. 2, ASU law: the general segregation was extracted from the air means crude helium, neon gas mixture, from crude helium, neon gas mixture made of pure helium, neon gas mixture separation and purification, obtained 99.99% pure helium . 3, hydrogen liquefaction method: Industrial use of helium from hydrogen liquefaction mention ammonia exhaust. The method process is cryogenic adsorption of nitrogen purge, distillation to give crude helium and oxygen in addition to the catalytic purification of helium and hydrogen, to obtain 99.99% pure helium 4, high purity helium method: 99.99% pure helium is further purified by adsorption with activated carbon to obtain high purity of 99.9999% helium. Helium manufacturers, Hunan helium abundance of the group, high purity helium group Co., Ltd. Qingdao force provided by HSBC Trade and Industry. Groups of Qingdao Fung Ltd. (www.qunlifeng.cn) strong, credible, in Qingdao, Shandong and other chemical products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the group into the abundance of brilliant and you work for a better future!