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About: Lean air     Goto   Sponge   NotDistinct   Permalink

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Lean air is a gas mixture with an oxygen content lower than 20.95% (the oxygen content of the normal breathing air). Lean air is made from a gas mixture of air with nitrogen or of pure oxygen with nitrogen and is used in several production processes where a product covering with pure nitrogen can be dangerous, undesirable or more expensive. In some production processes the oxygen content is necessary for the reaction process or during storage (e.g. synthetic resin production, acrylic compounds such as acrylic acid (CAAC) or butyl acrylate (BA)).