1、Selection of Abrasive materials:
    (1) According to Original criterion of Industry Department

Series	Code	Granularity	Applying fields
Diamond No.1	JR1	46#~280#	Used to make Resin binder grinding tools
Diamond No.2	JR2	46#~120#	Used to make Metal binder grinding tools

    (2) According to Criterion of China

Series	Code	Granularity		Usage
		Narrow series	Broad series
Synthetic Diamond	RVD	60/70~325/400	60/80~270/400	Used to make resin/ceram binder grinding tools or for grinding etc.
	MBD	50/60~325/400	60/80~270/400	Used to make metal binder grinding tools, plating products, drilling tool or for grinding etc.
Cubic Boron Nitride	CBN	20/25~325/400	20/30~270/400	Used to make resin/metal/ceram binder grinding tools etc.