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| - Additional materials include polymers such as polyolefins, polyimides, polyamides, fluoropolymers, polyetheretherketone (PEEK), cross-linked PVA hydrogel, polytetrafluoroethylene (PTFE), expanded polytetrafluoroethylene (ePTFE), porous high density polyethylene (HDPE), polyurethane, and polyethylene terephthalate, or biodegradable materials such as polylactide polymers and polyglycolide polymers o
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