"High-silica" glass ball is a sodium borosilicate glass, used to produce "high-silica" glass fiber. "High-silica" glass fiber. Is a high-temperature inorganic fibers, the softening point close to 1,700 degrees Celsius, 900 degrees C environment in the long term use, can be used for spacecraft thermal protection, ablative materials, fireproof materials, heat insulation, heat insulation materials, etc., can be made a variety of products. 
 High silica glass marbles belong to Na2O-B2O3-SiO2glass. They are used to make high silica fiber, which can be used for the thermal insulation of spacecrafts, ablative materials, high temperature-proof materials and high temperature-resistant insulation materials etc.