BS EN 451-2:2017规定了通过在0045 mm筛上湿筛测定飞灰细度的方法（ISO 565）。欧洲标准规定了参考程序。如果使用其他方法，则需要证明它们给出的结果与参考方法得到的结果相同。如有争议，仅使用参考方法。交叉引用:EN 450-1:2012ISO 565:1990（R06）ISO 3310-1:2016购买本文件时可获得的所有现行修订均包含在购买本文件中。

BS EN 451-2:2017 specifies the method for the determination of fly ash fineness by wet sieving on a 0,045 mm sieve (ISO 565).The European Standard specifies the reference procedure. If other methods are used it needs to be shown that they give results equivalent to those obtained by the reference method. In case of a dispute, only the reference method is used.Cross References:EN 450-1:2012ISO 565:1990 (R06)ISO 3310-1:2016All current amendments available at time of purchase are included with the purchase of this document.