SiO2

≤0.01% in acid soluble iron (Fe)

≤0.5% soluble in HCl

≤0.5% loss on ignition, 800 °C

chloride (Cl-): ≤100 mg/kg

acid washed

n20/D 1.544(lit.)

2.6 g/mL at 25 °C(lit.)

1610 °C(lit.)

Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter

3