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本标准物质系由实心球形微珠按一定分布配制而成,是用于校准试验筛筛孔孔径的国家一级标准物质。按粒径分为两种:GBW12002的测量范围为65～200μm(相当于80～200目);GBW12003的测量范围为30～80μm(相当于200～450目)。两者量程相互衔接,覆盖了工业及科研部门常用的筛分范围。
This standard material by the solid spherical beads prepared by a certain distribution, is used to calibrate the test sieve pore size of the national standard material. According to particle size divided into two kinds: GBW12002 measurement range of 65 ~ 200μm (equivalent to 80 ~ 200 mesh); GBW12003 measurement range of 30 ~ 80μm (equivalent to 200 ~ 450 mesh). The range of the two link with each other and cover the range of screening commonly used by industry and scientific research departments.