Coated sand will review the index in 1992 amended the provisions of coated sand industry standards are: room temperature flexural strength, thermal bending strength, loss on ignition, particle size and melting point. Optional detection indicators are: room temperature tensile strength, tensile strength hot, gas evolution and mobility. Performance coated sand for nearly 10 years has been greatly improved, a corresponding increase in the number of new detection indicators: (1) high temperature compressive strength - to simulate actual conditions of casting, coated sand core test at the time of 1000-1500 ℃ compressive strength. (2) Heat time - test coated sand core at a high temperature (700-1500 ℃) to maintain strength, coated sand equipment manufacturers, no distortion, no collapsing of time. (3) anti-Shelling - The test coated sand against shelling capacity. Phenolic resin sand regeneration according to the principle that the regeneration of waste sand at high temperatures, can form an oxide of silicon crystal silica sand - quartz in the same structure variant β crystal transition from α crystalline, lower coefficient of thermal expansion of silica sand. Reclaimed sand used, can reduce the casting deformation, burrs and other defects. When the regeneration of waste sand, coated sand, sand the surface of the resin film also makes combustion and impurities such as silica metal oxide stripped improve sand silicon-oxygen bond activity. When can improve regeneration instead of the original sand coated sand coated sand production, increased sand strength to prevent the casting sticky sand and porosity. In the coated sand production areas should be strengthened following two aspects: (1) made of coated sand pollution, mainly from the following aspects: ① reduce the amount of resin and curing temperature; ② coated sand to improve the overall performance, especially ③ strengthen pollution research phenolic resin alternatives; high temperature performance;. (2) increasing the regenerative capacity of coated sand coated sand regeneration _ Qingdao Heng (Online) _ coated sand by Qingdao Heng Machinery Co. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) is in Qingdao, Shandong Cleaning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Qingdao Heng leadership with the staff warmly welcome all inquiries negotiations to create a better future Qingdao Heng.