| http://www.w3.org/ns/prov#value | - The various parts of the system may be made from any suitable corrosion-resistant metal, a chemically inert plastic such as a polyamide (nylon), polyethylene, halogenated polyethylene (Teflon), polyvinylidene chloride (Saran), a suitable polyester or an epoxy resin, provided they possess the desired degree of rigidity, strength and fatigue resistance.
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