| http://www.w3.org/ns/prov#value | - A foil is preferred with a thickness between 40 and 100 ??m, especially between 52 and 70 ??m, whereby the coating with polyethylene terephthalate has a thickness between 8 and 20 ??m, especially between 10 and 14 ??m, the aluminium foil a thickness between 6 and 15 ??m, especially between 7 and 11 ??m and the coating with chlorinated polypropylene a thickness between 26 and 65 ??m, especially bet
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