Opinions About The Use of Ammonium Bifluoride

Ammonium Bifluoride, whose molecularformula is NH₄HF₂, is a weak acid salt of HF. If you add Sulfuric or Hydrochloric acid to the ABF you will have more HF in solution than with just the ABF. You will have to do some chemistry to figure the molar amount of acid needed to get the equivalent amount.
The use of  Ammonium Bifluoride as a "safe" replacement for hydrofluoric acid is a unsafe practice. The uninitiated person who judges this as "safe" can quickly get into trouble since once the Ammoniuim Bifluoride (NH4F)HF is contacted with water, it will decompose to Ammonium Fluoride, NH4F and hydrofluoric acid ,HF. The HF content of the resulting solution will be ~ 33% of the original Ammonium Bifluoride and; if at the salt's solubility limit of ~ 40%, the HF content will be ~ 13%. . . very corrosive, toxic and hazardous.
Some folks have used Ammonium Bifluoride as a substitute for HF and created (what they refer to as ) a "acid free" wheel cleaner. A dangerous and deceptive practice.

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