| http://www.w3.org/ns/prov#value | - Other foam materials which can be employed herein include foamed or expanded polyvinyl chloride, phenol-formaldehyde resin foams, urea-formaldehyde foams, foamed elastomers such as natural rubber, styrene-butadiene rubber foam, polychloroprene foam, chlorosulphonated polyethylene-ethylene-propylene terpolymer foam, butyl rubber foams, polyacrylate foams and silicone foams.
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