Za'a iya ƙididdige ma'auni nauyin bututun bakin karfe ta amfani da sigogi kamar yawa, diamita na waje, kaurin bango, da tsayi. Muna ba da nau'ikan bututu mai tsafta na bakin karfe, gami da yawa na 0.024913, diamita na waje daga 0.1-80mm, kauri daga 0.05-3mm, da tsayi daga 2-2500mm. Dangane da waɗannan sigogi, ana iya ƙididdige nauyin ma'auni na bututun bakin karfe da ake buƙata daidai.
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