① Whetstone corundum or silicon carbide abrasive and bonding agent made no matrix, its cross-sectional shape can be divided into squares, rectangles, triangles, knife-shaped (wedge-shaped), circular and semi-circular Whetstone; Dongyang greenstone Whetstone factory professional sales honing oil stone, a variety of specifications to meet your choice, strict production process to ensure quality, even with high precision honing oil stone wholesale, high efficiency Whetstone new and old customers! Abrasive hardness depends mainly on the amount of binding agent number and density of Whetstone abrasive grit off easily, said low abrasive hardness; conversely best Whetstone, represents a high hardness. Hardness level is generally divided into the super soft, soft, soft, medium, medium-hard, hard and superhard grade seven, from these levels can be subdivided in a number of small magnitude. Method for determining abrasive hardness, more commonly used hand cone, mechanical cone method, Rockwell hardness measurement method and blasting hardness assay. Dongyang greenstone Whetstone Whetstone factory specializing in sales of abrasive manufacturers, a variety of specifications to meet your choice, strict production process to ensure quality, more abrasive with high precision and high efficiency new and old customers! Whetstone Purchase | jade stone factory credible (certified) | Jilin Whetstone provided by the town of Dongyang Qianxiang beryl stone factory. Qianxiang Town, Dongyang beryl stone factory (www.322124.com) Zhejiang Jinhua, Abrasives leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . In greenstone Whetstone plant leadership with the staff warmly welcome all inquiries negotiations to create jade stone factory a better future.