They are used to make high silica fiber, which can be used for the thermal insulation of spacecrafts, ablative materials, high t High silica glass marbles belong to Na2O-B2O3-SiO2 glass. 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.
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