| http://www.w3.org/ns/prov#value | - Even small amounts of air entering the system through leaks or, more usually, by being entrained by the coated substrates passing through the curing apparatus, can easily raise the oxygen concentration above acceptable limits unless inordinate amounts of an inert gas such as nitrogen, carbon dioxide, argon, helium, methane, ethane or propane are used to purge the system.
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