After being filled with helium, it can be used for the arrangement of balloons and toys in wedding celebrations, banquets and other activities. As a completely inert gas, helium will not react with any substance, and has higher safety and operability compared with hydrogen with combustion and explosion. Suitable for non professional families and individuals. Portable helium tank. 1. A disposable cylinder valve is installed on the portable household helium tank to ensure that the steel cylinder can only be used once and cannot be refilled. The person who fills the tank shall bear legal liability for any accident that may be caused by refilling. 2. Portable household helium cylinders shall be stored in a cool, ventilated and dry place, and the ambient temperature shall not exceed 55 ° C. During transportation, try to prevent collision, falling, damage and deformation of the bottle. 3. The bursting disc on the steel cylinder shall be protected from knocking to prevent collision and friction of sharp and hard objects. When using, ensure adult operation. Colorless, tasteless and odorless inert gas in gaseous state under normal temperature. The gas with the lowest critical temperature, which is the most difficult to liquefy, is extremely inert, and can neither burn nor support combustion. Dark yellow when discharging under low voltage. Helium has special physical properties, and it will not solidify under its vapor pressure at absolute zero. Nitrogen has stable chemical properties and generally does not generate compounds. It can form He+2, HeH plasma and molecules when excited in a low-voltage discharge tube. Compounds can be formed with certain metals under specific conditions.