| http://www.w3.org/ns/prov#value | - However, in other embodiments, the tie bars or the endplates may be made out of polymeric materials, such as polyvinyl chloride, chlorinated polyvinyl chloride, polypropylene, polysulfone, polyethylene, a polyolefin, a ceramic, or other inert or non-conducting materials, such as for safety reasons, cost, reliability, ease of manufacture, or ease of maintenance.
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