40% Hydrofluoric Acid (HF) is a highly corrosive and volatile solution of hydrogen fluoride gas in water. It is exceptionally dangerous due to a unique dual-hazard mechanism.
Its primary industrial and technical utility stems from its ability to dissolve silica, which is a component of glass, ceramics, and silicon compounds.
Appearance: A clear, colorless liquid; concentrations above 40% will fume in air.
Primary Uses: Essential in glass etching, metal cleaning (especially stainless steel), and the semiconductor/electronics industry for cleaning silicon wafers.

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