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用球形实心玻璃微珠构成的标准物质是校准试验筛用的国家一级标准物质。其测量范围以有效筛孔径计为３５－２００μｍ，覆盖了工业生产和科研中筛分的常用区段。本文简要介绍其研制、定值及校准方法。
The standard material composed of spherical solid glass beads is a national standard material for calibration test sieves. Its measuring range is 35-200μm with an effective sieve aperture, covering common sections for screening in industrial production and research. This article briefly describes its development, setting and calibration methods.