National standard for glass beads

The national standards for glass microspheres cover many aspects, including chemical composition, physical properties, performance parameters, test methods, etc.The following is a partial detailed introduction.

chemical composition.The main chemical components of glass beads include SiO2 (silica), CaO (calcium oxide), MgO (magnesium oxide), Na2O (sodium oxide), Al2O3 (aluminum oxide) and Fe2O3 (iron oxide), of which the SiO2 content usually exceeds 67%, CaO content exceeds 8.0%, MgO content exceeds 2.5%, Na2O content is less than 14%, Al2O3 content is between 0.5% and 2.0%, Fe2O3 content exceeds 0.15%, and other element content is less than 2.0%.physical properties.The particle size of glass beads is usually between 10 and 250 microns, the wall thickness is about 1 and 2 microns, the packing density is about 1.5 g/cubic centimeter, the Mohs hardness is between 6 and 7, and the Rockwell hardness is 48 and 52 HRC.Performance parameters.Glass microspheres have good chemical stability, low thermal conductivity and high strength. The surface has been specially treated to make them lipophilic and hydrophobic, making them easy to disperse in organic material systems.Application scope.Glass beads are widely used in many fields such as building materials, chemical industry, metallurgy, agriculture, etc. They are especially suitable for normal temperature environments and cold insulation industries (temperatures higher than -80 degrees Celsius) and high temperature locations (temperatures below 800 degrees Celsius).The standard for high-performance hollow glass microspheres specifies in detail terms and definitions, technical requirements, performance parameters, test methods, inspection rules, etc., and is applicable to the production and application of high-performance hollow glass microspheres.