Hydrogen; Ammonia alum; Ammonia for industrial purposes; Ammonia water; Dry ice; Ethylene; Ethylene chlorohydrin; Ethylene dichloride; Ethylene glycol; Ethylene oxide; Hydrogen chloride; Hydrogen cyanide; Hydrogen peroxide for industrial purposes; Hydrogen sulphide; Liquid carbon dioxide for industrial purposes; Methane; Nitrogen compounds; Nitrous oxide for industrial use; Silicon; Silicon carbide for industrial purposes; Silicon dioxide; Solidified protective gases for welding; Welding and ...