| http://www.w3.org/ns/prov#value | - The materials considered for manufacture of the flexible slurry valve seal of the invention include, but are not limited to the following: Rubber, natural or synthetic, Plastics, such as polyurethane and high density polyethylene (HDPE), Composite materials, such as rubber/polyurethane or fiber reinforced polyurethane or reinforced rubber composites, composites of different types of rubber, Metal,
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