Grinding / mixing / powder research equipment is a necessity for experiments for shredding and sieving materials. Spheres are used to break up materials. Stainless steel was the most common, but ceramic, polyethylene, nylon, etc. are also used depending on the hardness and weight of the material to be ground. Hard zirconia is suitable for ceramics. Nylon is especially suitable for substances that want to avoid contamination with metals and ceramics. For grinding, grinding machines equipped with a 700 W motor, manual hand crushers, automatic mortars, etc. are also used. Many sieves are made of stainless steel, and it is efficient to use a sieve shaker that can use multiple sieves at once. There is also a bolting cloth, which is also used as a protective material.