Sell Sell Quarz (silica) stone

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2. Quartz (Silica) Stone

special grade: SiO2: 99.96%min; Fe2O3: 4ppm Max.

1st grade: SiO2: 99.90%min; Fe2O3: 40ppm Max.

2nd grade: SiO2: 99.80%min; Fe2O3: 100ppm Max.

3rd grade: SiO2: 99.60%min; Fe2O3: 300ppm Max.