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Silica gel indicator orange-green Grit: 3-5MM Plastic bottle 750 ml Substance designation Chemical name: Amorphous silicon dioxide CAS number: 112926-00-8 CAS numbers: ≥99% silicon dioxide SiO2 7631-86-9 1% copper Cu 7440-50-8 ≤1% water H2O 7732-18-5