| http://www.w3.org/ns/prov#value | - This type of porous layer in a hydrogel or elastomer can be done by steps such as using a layer of salt, sugar, or other granular compound (or ???intercalating??? fibers or other material, such as a wax-like material that can be melted and/or vaporized at a temperature that will not damage the gel or elastomer) during the processing step that is used to mold the gel or elastomer in the rim area.
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