Abrasive grain size refers to the degree of thickness of abrasive, its specifications with grain size number, divided into two categories, namely F grit and P grit. F sand is used to produce consolidated abrasive tools with a total of 37 grain sizes, among which 26 are coarse and 11 are fine. P grit is used for the production of coated abrasives, with a total of 28 grain sizes, including 15 with coarse grain size and 13 with fine particle size. The coarse abrasive grain are above 63um, which are produced by screening method. The size of fine grain (hereinafter referred to as micro powder) is below 63um, and water separation method is used for production. However, some enterprises use airflow classification for production, and some enterprises use airflow and water combination for production.
Coated with abrasive because of its manufacturing technology and conditions of use has special, therefore also has special requirements for the grain size composition of abrasive, and coated with abrasive abrasive with coarse grinding grain has 15 grain sizes, respectively for P12/ P16/ P20 / P24 / PP30 / P36 /P40 / P50 / P60 P80 / P100 / P120 / P150 / / P220 P180. Micro powder has 13 grain sizes, respectively for P240 / P280/320 / P360 / P400 / P500 / component/P800 / P1000 / P1200 / P1500 / P2000 / P2500. See GB/T9258. The grain size composition of the coated abrasive at GB/T9258.2. The determination of the grain size composition at GB/T9258.3