| http://www.w3.org/ns/prov#value | - num, tantalum, niobium, zirconium, zinc, various kinds of stainless steel, and alloy thereof; preferably, titanium, chromium, tungsten, various kinds of stainless steel, and alloy thereof are desirable.The thickness of the metallic foil is generally preferably within a range of 5 ??m to 1000 ??m, more preferably within a range of 10 ??m to 500 ??m, and far more preferably within a range of 20 ??m
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