不能覆盖，ISO 15614-1 8.44-Filler material, designation 填充材料选用规定：
‘Filler materials cover other filler materials as long as they have equivalent mechanical properties, same type of covering core or flux, same nominal composition and the same or lower hydrogen content according to the designation in the appropriate European standard for the filler material concerned. 只要它们拥有相等的机械性能、相同类型的药皮或焊剂、相同的公称成分、相同的氢含量或低于（被评定填充材料）的氢含量，且符合有关填充材料的适当欧洲标准选用。’
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