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, no distortion, no collapsing of time. (3) anti-Shelling - The test coated sand against shelling capacity. Other special requirements for coated sand to meet the needs of different products, developed a series of special coated sand as: centrifugal casting coated sand, chilling coated sand, wet coated sand, sand sticking, anti-veining, Anti-cellulite coated sand. While in 2004 the newly introduced fast-curing coated sand on the basis of having the performance of the curing rate can increase 30 to 70%, improve production efficiency, coated sand suppliers and energy saving easy collapsibility coated sand having class good strength, but also has excellent low temperature performance collapsing, coated sand for the production of non-ferrous metal castings. 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 coated sand production equipment package recycling the majority of experts has been a subject of concern, coated sand reclamation line, now coated sand regeneration equipment is expensive and regeneration efficiency is not high, cover Sand casting the film, the production efficiency of 5 tons / hour of thermal regeneration equipment prices in 1200-1600 yuan, regeneration coated sand cost 65-90 yuan / ton, so the cost can not be for the domestic foundry enterprises coated sand casting, coated sand, provided by Qingdao Qingdao Heng Heng Machinery Co. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) strong, credible, in Qingdao, Shandong Cleaning equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Qingdao Heng and you hand into the brilliant, for a better future!