| http://www.w3.org/ns/prov#value | - These and other treatment vessels can be formed from such materials as polyethylene, polypropylene, poly(ethylene teraphthalate) (PET), polystyrene, acetal, silicone, polyvinyl chloride PVC), phenolic, glasses and other inorganic materials, metals such as aluminum and magnesium, and laminates such as polyethylene/aluminum and polyethylene/polyester.
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