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Precision Glass Balls 75% SiO2 , 15% NaO2 , 8% CaO2 Density Is 2.8g/Cm3 , Intension Is 700kg/Mm2 Glass Precision Ball The material of Glass Precision Ball is made up of 75% SiO2, 15% NaO2 and 8% CaO2, ...