ISO 6344

ISO 6344 is an international standard covering the materials sizes and tests regarding sandpaper and other similar coated abrasives.
It has three parts:

ISO 6344-1:1998: Grain size distribution test
ISO 6344-2:1998: Determination of grain size distribution of macrogrits P12 to P220
ISO 6344-3:1998: Determination of grain size distribution of microgrits P240 to P2500

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