标准筛目与微米比较表目/寸20253035404550607080100120140170200230250270300微米(um)850710600500425355300250212180150125106907563585350目/寸325350400450500550600700800100013401670200025005000625080001000012500微米(um)45733832282623201813108.56.552.621.61.31计算方法：目数＝12500 / 颗粒粒径（um）