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Old 2012-07-05, 9:14pm
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houptdavid houptdavid is offline
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Join Date: Jan 14, 2008
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Etching creme, liquid and "crystals" are Ammonium bifloride

Wink rust remover contains HF

http://en.wikipedia.org/wiki/Ammonium_bifluoride

http://en.wikipedia.org/wiki/Hydrogen_fluoride


From finishing.com...
"The use of (dry) 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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Last edited by houptdavid; 2012-07-05 at 9:18pm.
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