Magnesia refractory products magnesia products are alkaline (basic refractory). High melting point of magnesium oxide, so the use of very high temperatures, can be used in an oxidizing atmosphere to 2000 ℃, in a reducing atmosphere can be used to more than 1700 ℃. Because anti-alkaline slag erosion resistance, suitable for smelting many metals, precious metals, heavy metals and rare metals. Magnesia ceramics production methods: Alcohol injection molding mud burn, burn grout injection molding, isostatic molding, extrusion molding mud and machine molding method. Refractories (Refractory material) of air permeability air permeability allows gas to pass through the material under pressure performance. Since the gas through the permeable material through the pores, the air permeability and the size of the through pores, volume, structure and physical and chemical indicators state of clay, and with the pressing direction during molding of refractory products varies. It and the porosity of a relationship, but no regularity clay, and again, and the porosity is different. Certain refractories (Refractory material) clay prices, the air permeability is very critical indicators, directly affect its anti-corrosion medium, such as slag, molten steel, molten iron and various gases (steam) erosion resistance, oxidation resistance, ventilation function. Certain clay material suppliers, such as flame or hot gases for isolation or in direct contact with the slag, the molten metal article, is required to have a very low air permeability; and some functional materials, there must have a certain degree of air permeability . Refractories (Refractory material) directly affected by the permeability of the production process, by controlling the ratio of the particles, forming pressure and firing system can control the permeability of the material. On the air permeability of dense shaped refractory products, in accordance with the national standard GB / T3000-1999 (equivalent to international standards ISO8841: 1991) were measured. _ Shangzhuang refractory brick manufacturers (certified) _ Hangzhou clay provided by shangzhuang Refractories Co., Ltd., Zhengzhou City. Zhengzhou City shangzhuang Refractories Co. (www.yntjj.com.cn) (www.yntjj.com.cn) is Zhengzhou, charge, flux leader, over the years, the company is implementing the scientific management, innovation and development, honesty and trustworthiness guidelines, and satisfy customer needs. In shangzhuang refractory leadership with the staff warmly welcome all inquiries negotiations to create shangzhuang Refractories a better future. You can also access (www.yntjj.com.cn/supply_details_45555665.html), for more information about the company.