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Most acids, metals, chlorine and bromine are unreactive with fused quartz 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 above about 150°C. Hydrofluoric acid alone will attack it at all temperatures. Carbon and some metals will reduce fused quartz; basic oxides, carbonates, sulfates, etc., will react with it at elevated temperatures. For general use, however, it can be concluded that fused quartz is quite unreactive.
The effects of various elements and compounds on fused quartz at elevated temperatures are observed in a vacuum. Each sample is held at the lowest temperature for one hour, then at the next highest temperature for one hour, and so on. The extent of the reaction is, of course, also time-dependent.
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Momentive Performance Materials
