For general use, fused quartz is unreactive, including when exposed to most acids, metals, chlorine and bromine at ordinary temperatures. It is slightly attacked by alkaline solutions, the reaction rate increasing with temperature and concentration of solution. Phosphoric acid will attack fused quartz at temperatures about 150 °C. Hydrofluoric acid alone will attack at all temperatures. Carbon and some metals will reduce fused quartz; basic oxides, carbonates, sulfates, etc., will react with it at elevated temperatures.
The effects of various elements and compounds on fused quartz at elevated temperatures are observed in a vacuum. Each sample, as shown in the reactivity table, is held at the lowest temperature for one hour, then at the next higher temperature for an hour, and so on. The extent of the reaction is, of course, also time-dependent.
View the reactivity of fused quartz
Note: Test results. Actual results may vary.
For more information regarding the use guidelines for fused quartz, click here.