(1) the general category of quartz sand coated sand, thermoplastic phenolic resin, methenamine and calcium stearate, without concerning additives. Generally applicable to the production of cast iron. (2) high-strength low gas class ordinary coated sand coated sand replacement products, by adding additives and use of new technology related to the preparation, its strength is higher than 30% more than ordinary coated sand, gas evolution was also significantly reduce coated sand processing, for the production of complex precision iron castings. Easy collapsibility coated sand: it is for non-ferrous metals (especially aluminum) is not easy to sand casting and developed a coated sand. The sand also has good strength has excellent low temperature collapsibility. After using it non-ferrous metal production (aluminum, copper alloys, etc.) coated sand casting equipment, does not require re-heating the casting sand coated sand plant, just after pouring the casting to cool for 24 hours, then SHAKERS . Centrifugal Casting coated sand: the coated sand suitable for centrifugal casting process, it can be used to replace the production of centrifugal casting and other coating materials based on iron pipe diameter size and technical requirements are different, can be processed into different performance centrifugal casting coated sand. Differs from other types of coated sand is sand that covered some high density, low-fat and fat volume of gas slowly coated sand _ Qingdao Heng Enterprise (certified) _ Chongqing coated sand by Qingdao Heng Machinery Limited. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) is Qingdao, cleaning, 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 led the staff warmly welcome all inquiries negotiations to create a better future Qingdao Heng.