Grit type is either aluminum oxide (white, pink, ruby red, brown, grey, etc.) silicon carbide (black or green), ceramic (blue and pink) or any combination of these. Grit types are sometimes mixed in combination for achieving certain cutting characteristics. Aluminum oxide is friable (white) or semi-friable (pink, brown and grey, red, etc.). Friable grit breaks down more easily and is useful for cutting harder materials.
Dynamic image analysis (DIA) Static light scattering (SLS, also called laser diffraction) Screen analysis Impedance method Sedimentation