| http://www.w3.org/ns/prov#value | - The outside of the tubes may be altered or treated so that cements or polymerizeable plastics will adhere thereto. [0086] A fifth class of fibers is comprised of hollow impermeable tubules typically formed from plastics including, but not limited to, polyethylene, polypropylene, Teflon??? or polyvinyl chloride, and is filled completely with a gel or other polymerizing material to which agents of i
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