Refractories (Refractory material) the true density is the true density refractories (Refractory material) in the solid mass to its true volume (volume of solid portion) ratio. True specific gravity is the ratio of the true mass of the unit volume of the material mass and 4 ℃ unit volume of water. Both can be considered the same in value. The international community has a true specific gravity of this concept is no longer used, but in Japan refractories (Refractory material) Technology Association of editing and publishing the "refractories (Refractory material) Handbook," a book is still in use true proportion. Refractories (Refractory material) in the true density is a measure of quartz silica brick extent of conversion of important technical indicators. Different true density SiO2 composed of different minerals refractory low, the true density of the smallest BP phosphorus, followed by refractory wholesale cristobalite, quartz maximum. Phase transition in multiphase material, the chemical composition of the refractory material is constant, according to the data to determine the true density of the material phase composition. For the true density of refractory products and refractory materials, according to the national standard GB / T5071-1997 (identical with ISO5018: 1983) were measured. What is refractories (Refractory material)? Refractories (Refractory material) generally refers to the refractoriness at 1580oC or more inorganic non-metallic materials. It includes natural minerals and purpose in accordance with the requirements of certain process made after a certain variety of products having a certain high temperature mechanical properties, good volume stability, the material necessary for a variety of high-temperature equipment. Refractory species, shangzhuang Refractories (certified), Macao Special Administrative Region of refractories 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_45137685.html), for more information about the company.