Coated sand recycling the majority of experts has been a subject of concern, coated sand, now coated sand regeneration equipment is expensive and regeneration efficiency is not high, productivity is 5 tons / hour of thermal regeneration equipment prices in 1200-1600 Wan Yuan, recycled coated sand will cost 65-90 yuan / ton, so the high cost of domestic foundry enterprises can not generally accepted. Therefore, the development of economic and efficient recycling equipment coated sand has a broad market prospect (1) General Category coated sand made of quartz sand, thermoplastic phenolic resin, hexamine and calcium stearate, without concerning additives. For the production of cast iron in general. (2) high-strength low gas category is the ordinary coated sand coated sand replacement products, by the addition of additives and use of new technology related to the preparation, its strength is higher than 30% more than ordinary coated sand, gas evolution was significantly reduce, coated sand foundry for the production of complex precision iron castings. Adhesive properties have a great impact on the quality of coated sand, people have been working on how to improve the performance of phenolic resin, and to find alternatives to phenolic resin. Foreign countries have developed different properties dedicated resin coated sand casting, such as high strength, low gas resin, the resin is easy to collapsing, there are reports of a modified polyester resin, but did not get round to promote, so far is still widely used modified phenolic resin. China developed rapidly in recent years in research and development Phenolic resin coated sand, has developed a different modified phenolic resin coated sand for the production of stainless steel | Qingdao Heng (Online) | coated sand from Qingdao Heng Machinery Limited. 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.