Common coated sand: its composition is generally, methenamine, and calcium stearate is comprised of silica sand novolac resin, without relevant additives. The resin is usually relatively high amount at a certain strength requirements, do not have high temperature, low inflation, low gas and other characteristics suitable for some less demanding, simpler structure of cast iron production. High strength, low gas coated sand: on the basis of ordinary coated sand coated sand on renewable manufacturers, by adding the relevant characteristics of "additive" and the introduction of new recycling plant coated sand preparation process, so a substantial decline in the amount of resin coating membrane sand recycling machinery, significantly reducing gas evolution, and can delay hair air speed. The coated sand with high strength, low inflation, low gas, gas and other characteristics of slow hair coated sand regeneration, especially for iron castings, steel castings in small and medium volume requirements for low-fat sand core, such as sand and other core body Sand type of iron technology first developed in the small and medium enterprises in the casting up and successfully applied. The late 1970s, China's first iron built with Sand casting production lines. 80 years later, China's iron-type cladding sand casting process and application of basic research enterprises have formed teams and get faster development. At present, China has hundreds of companies with Sand cast iron used in production, with an annual output of iron with Sand casting about 100,000 tons (mainly crankshafts, camshafts, gears and export castings, etc.), the annual consumption of coated sand approximately 20,000 tons. Coated sand regeneration manufacturers, coated sand regeneration, provided by Qingdao Heng Heng Machinery Co., Ltd. Qingdao. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) strong, credible, Shandong Qingdao 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!