| http://www.w3.org/ns/prov#value | - Where elastic products of such compositions are subject to surface abrasion, for example, in applications such as lip seals for hydraulic and shaft seals, vane pump seals, valve seals, and the like, the elastomer at the surface may be abraded; but the surface exposed to abrasion can then become predominantly PTFE which is lubricious and highly abrasion resistant.
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