Walnut shell is one type of grains after degreasing, breaking up and screening. Because there are lots of microspores on the walnut shell surface, walnut shell is ideal filter material with excellent adsorption effect. Because the walnut shell has many faces, walnut shell is natural tumbling material and polishing abrasive. And even the walnut shell is soft compared with metal abrasive or stone abrasive, the walnut shell does not damage the work piece surface.

Walnut shell is with strong stress tolerance. The walnut shell with sizes of 1.25~1.60mm, the average ultimate compressive strength is 0.2295KN (23.40kgf). The walnut shell with sizes of 0.80~1.00mm, the average ultimate compressive strength is 0.165KN (16.84kgf).

The chemical property of walnut shell is stable. Walnut shell is non-toxicants, its dissolution into acid, alkali or water is very small. The walnut shell wastage rate into hydrochloric Acid solution is 4.99%. The walnut shell wastage rate into hydroxide solution is 3.80%.

Because there are lots of microspores on the walnut shell surface, walnut shell is ideal filter material with excellent adsorption effect. Walnut shell is widely used in oil field to adsorb oil stain. Walnut shell is widely used in industrial wastewater treatment of chemical industry and leather industry to improve the water quality. walnut shell does not cause water quality deterioration. Walnut shell is widely used in water plant to purify water quality. Walnut shell is the optimal water purification filter material for series of filters.

Because the walnut shell has many faces, walnut shell is applied in polishing or deburring glasses fittings, pearl jewelry, buttons, and electronic components, stampings, etc.