Walnut shell by shattered after degreasing, crushing, screening, classification and processing of walnut shell particles, surface porosity, adsorption filtration material, has good filtering effect, is also a natural roll of light materials and polishing abrasive, abrasive use it won't destroy the workpiece surface, and the polishing effect is good, excellent durability, now widely used in soft spraying cleaning and polishing metal, glass, glass fiber, wood, plastic and stone.