| http://www.w3.org/ns/prov#value | - Layer 12 is a sealable, preferably heat sealable, layer which can be formed of any polymeric material, such as a polyolefin; more preferably ethylenic polymers, such as ethylene/alpha-olefin or ethylene/unsaturated ester copolymers, such as ethylene/vinyl acetate copolymer, and ethylene/alkyl acrylate copolymer; as well as polyamides, or polyesters.
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