我国磨料磨具GS3—59规定棕刚玉Al_3O_3含量不小于95％,未规定上限。第三砂轮厂曾有一段时间冶炼的棕刚玉Al_2O_3含量达到97％以上,用户反映这种磨料制造的砂轮颜色不发兰,磨削性能差。因标准对此没有严格规定,曾引起磨料行业的争论。为此63年12月份行业技术委员会,第一次会议提出。把该问题列为行业课题,由第三砂轮厂和磨料研究所共同 China abrasive abrasive GS3-59 specified corundum Al_3O_3 content of not less than 95%, no provision of the upper limit. The third wheel factory had some time corundum corundum Al_2O_3 content of more than 97%, the user reflects the abrasive wheel manufacturing color is not blue, poor grinding performance. There is no strict rules on this standard, has caused controversy abrasive industry. For 63 years in December this year, the Technical Committee, the first meeting proposed. The issue as an issue of the industry by the third wheel factory and abrasive Institute common