| http://www.w3.org/ns/prov#value | - However, if the resin of the tubing is a polyolefin, a polyurethane, a silicone or a vinyl, the stripping or etching should be effected by a hot oxidizing acid such as a combination of sulfuric and chromic acids or a combination of sulfuric acid and sodium dichromate, at about 110???-170??? F. for about 1-45 minutes.
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