Hydrogen fluoride

Hydrogen fluoride (CAS 7664-39-3), also known as HF, fluohydric acid, or fluorhydric acid, is a strong inorganic acid produced by reacting fluorite with sulfuric acid. It carries no assigned E-code and is classified under the Inorganic Acids category. No common food-grade abbreviation applies.

In electronics manufacturing, HF etches silicon dioxide layers from semiconductor wafers by selectively dissolving the oxide through fluoride ion attack on Si-O bonds. In mining and metals processing, it dissolves metal oxides and silicate gangue during ore beneficiation and metal surface pickling. Pharmaceutical and water treatment applications exploit its buffering capacity to maintain precise pH ranges in process streams.

This product is supplied as a liquid produced via double sub-boiling quartz distillation, yielding high-purity grades suitable for semiconductor and analytical applications. It falls under REACH regulation and requires strict hazard communication under CLP. HS code 28111100 applies for import and export classification across EU member states.