| http://www.w3.org/ns/prov#value | - Preferred materials for the polymeric layer include polyethylene, polypropylene, polyglycolic acid, polylactic acid, polyester, a polymer or copolymer of silicone, and a polymer or copolymer of poly-2-hydroxyethylmethacrylate, such as a copolymer of a silicone polymer and poly-2-hydroxylethyl-methacrylate.
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