ISO 6344 is aninternational standard covering the definition and measurement of particle size for fused alumina (i.e.,corundum) andsilicon carbide grit used in coated abrasives, such assandpaper.^[1] It is closely related to standards defined by FEPA (Federation of European Producers of Abrasives).

It has two parts (ISO 6344-1:1998 has been withdrawn):

• ISO 6344-2:2021: Determination and designation of grain size distribution. Part 2: Macrogrit sizes P12 to P220^[1]
• ISO 6344-3:2021: Determination and designation of grain size distribution. Part 3: Microgrit sizes P240 to P5000^[2]

• Sandpaper grit sizes

• ISO.org

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