| http://www.w3.org/ns/prov#value | - As used thereinafter the expression modified with sulfuric acid means treating the surface of the polyetherimide, by immersion, spraying, painting, or other forms of surface treatment with an aqueous solution of hydrogen sulfate having a concentration of from 80% to 99%, at a temperature of 0??? C. to 85??? C. for from 10 seconds to 30 minutes.
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