前言 本标准给出了金刚石和ＣＢＮ（立方氧化硼）磨料颗粒尺寸规范，由ＦＥＰＡ（欧洲磨料磨具制造者联盟）制定和出版。它取代了１９７２年２月出版的第一版标准。 ＦＥＰＡ是在最初的砂轮制造者集团的基础上于１９５５年成立的，目的是为了研究欧洲范围内用户的问题。ＦＥＰ Preface This standard gives diamond and CBN (cubic boron oxide) abrasive particle size specifications, by the FEPA (European Abrasives Manufacturers Association) to develop and publish. It replaced the first edition of the standard published in February 1972. The FEPA was founded in 1955 on the basis of the original group of wheel manufacturers in order to study the problems of users in Europe. FEP