Standard Emery Grit for Determination of Flowability of Powder

A standard emery grit for determination of flowability of powders has been developed which shall be used for calibrating of the funnel of the apparatus. We tested many materials, finally a sort of natural mineral was chose as to make emery grit. The emery grit has had success though dressing and sieving. The reference material. has good wear resistace, chemical stability, homogeneity and is free of magnetic particles. All technical specifications of the emery grit accord with the demands of ISO4490.