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99.95% high purity Silicon dioxide SiO2 crystal for optical coating material/silicon dioxide for vacuum evaporation materials, granular 1-3mm 99.95% high purity Silicon dioxide SiO2 crystal for optical coating material/silicon dioxide for vacuum evaporation materials 99.95% high purity Silicon dioxide SiO2 crystal for optical coating material/silicon dioxide for vacuum evaporation materials, granular 1-3mm
