Praxair's primary products are: atmospheric gases -- oxygen, nitrogen, argon and rare gases (produced when air is purified, compressed, cooled, distilled and condensed), and process & specialty gases -- carbon dioxide, helium, hydrogen, semiconductor process gases, and acetylene (produced as by-products of chemical production or recovered from natural gas). The company also designs, engineers and constructs cryogenic and non-cryogenic supply systems.Praxair Surface Technologies is a subsidiary ...

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