Hydrofluoric acid (source Wikipedia) is a solution of hydrogen fluoride (HF) in water. It is used to make most fluorine-containing compounds; examples include the pharmaceutical fluoxetine (Prozac) and the material PTFE (Teflon). Elemental fluorine is produced from it.
Graphite is a good choice for applications related to semiconductors etching acid. The final acid should not contain any trace of metal ions wich disqualify all metallic heat exchangers.
Many exotic metals and alloys fail in corrosion with presence of fluorides.
PTFE lined piping and column show high permeation rate which will corrode the steel casing. Glass is easily corroded by HF.
Process of stripping of HF into high concentration sulfuric acid could require our grade GT OXY FLON. See our case story here.
Equipment frequently used
Materials frequently used
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