| http://www.w3.org/ns/prov#value | - The barrier 12 is formed of a flexible material that is resistant to chemical deterioration such as neoprene rubber, polyethylene, PVC or other material chemically resistant to hydrocarbons, petrochemicals or similar liquids, and is preferably about {fraction (1/16)} inches thick to allow it to be easily rolled or folded for storage and transport.
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