What is a certified reference material (CRM)?

A certified reference material is a material used for instrument calibration or performance verification, whose typical values are determined by reference material manufacturers, sometimes by counting, laser diffraction, sieving, or sedimentation. For this reason, there are sometimes small differences between results from users and the specifications from the reference material providers.

In addition to accurate particle size, the certified reference material should also be characterized by its good stability within a period (For example, one year), good monodispersity with a low variation coefficient, and a high degree of roundness (95-98% roundness).

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