GB/T 4513.3 - 2017 is the third part of the series of standards for amorphous refractory materials, which mainly describes its basic characteristics. The standard explains the definition and classification of amorphous refractory materials, and introduces in detail the basic characteristics of materials just after leaving the factory, such as Particle size distribution, water content, accumulation density, etc. By clarifying these basic characteristics, it lays the foundation for subsequent material performance testing, production application and mass control, which helps enterprises to choose materials rationally according to their characteristics and ensure the correct use and construction effect of amorphous refractory materials in the high temperature industrial field.