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Silicon Dioxide(SiO2) 1~3mm 2~4mm; 3~5mm ; Φ2x2mm ; Φ3x3mm; Φ25x10mm; Φ30x12mm 99.99% content used as glass evaporation material Specification of SiO2 Colorless Granule:1~3mm;2~4mm;3~5mm;99.99% ...