| http://www.w3.org/ns/prov#value | - The polymer envelope may also be made of a substantially non-elastic material such as, for example, collagen, microporous polyethylene, a polyamide such as nylon 4, nylon 818 or the like, polyvinyl acetate, microporous polypropylene, ethylene vinyl acetate copolymer, or the like, in which case the expanding agent will cause the polymer envelope to occupy its maximum volume without causing any dist
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