| http://www.w3.org/ns/prov#value | - The thickness of the polymer substrate itself, for example a polyethylene substrate, which is the starting material for such a sheet or film, may vary within a wide range and will normally be from 10 to 10,000 ??m, for most purposes preferably in the range 25 to 1000 ??m, and typically in the range 25 to 100 ??m such as 25 to 75 ??m.
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