| http://www.w3.org/ns/prov#value | - (5) When the diameter [D2] of the maximum inscribed circle of the Sn covering layer (refer to FIG. 1) is less than 1.2 ??m, consumption of the Sn covering layer due to thermal diffusion, aging and other causes expedites the extinction of the Sn covering layer, and the effect in improving heat resistance and corrosion resistance is therefore lowered.
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