Again, speaking with decades of experience using both 48% HF and NH4F*HF.
The Ammonium bifluoride is not more dangerous than HF.
Any HF on the skin results in a burn, period.
Ammonium Bi-Fluoride 25% is used here as well, and many of the staff have had it on their hands and arms and there is no reaction. Long exposure not washed off will redden skin.
As with any chemical, they wash it off, but Calcium is not required for bifluoride, just good hygiene....
Glenn Drew, Chief Chemist
Ray Complex, Hayden Laboratory
POBox 8 64 ASARCO Dr.
Hayden, Az 85135
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From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). [mailto:[log in to unmask]] On Behalf Of Jay Tompkins
Sent: Wednesday, September 21, 2011 2:10 PM
To: [log in to unmask]
We have a 2 gallon jug of ammonium bi-fluoride that is 90% in water, used for cleaning. Someone from PlasmaChem, a while ago, indicated that this stuff is more dangerous than HF because there is no burning sensation although its effect on the system is the same. Should we have calcium gluconate on hand as for HF and someone in EHS informed of this material here? The person who made up the solution moved onto another job and the jug is .
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