Refractories (Refractory material) by heat treatment can be divided into four categories: (1) fired brick; (2) does not brick; (3) unshaped refractory materials; (4) the melt (cast) products. Refractories (Refractory material) of air permeability air permeability allows gas to pass through the material under pressure performance. Since the gas through the material through the through-pores of the refractory, and the air permeability of the through pores of size, number, and the state of the structure, and with the pressing direction during molding of refractory products varies. It and the porosity of a relationship, but no regularity refractory agents, and again, and the porosity is different. Certain refractories (Refractory material), the air permeability is very critical indicators refractories where to buy, directly affect its anti-corrosion medium, such as slag, molten steel, molten iron and various gases (steam) erosion, oxidation resistance , ventilation function. For some materials, such as flame or hot gases for isolation or in direct contact with the slag, the molten metal of the refractory products wholesale, is required to have a very low degree of air permeability; and some functional materials, there must have a certain 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. Refractories wholesale, Haikou refractories, Refractories shangzhuang provided by Zhengzhou City shangzhuang Refractories Limited. Zhengzhou City shangzhuang Refractories Co. (www.yntjj.com.cn) (www.yntjj.com.cn) strong, credible, in Zhengzhou, Henan Province of charge, flux and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead shangzhuang Refractories and you hand into the brilliant, for a better future! You can also access (www.yntjj.com.cn/supply_details_47640675.html), for more information about the company.