Potassium bifluoride
CAS No. 7789-29-9


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ACTIVITY: Wood Preservative (Inorganic)


Adverse Effects:

Chemical Weapons Precursor for the production of sarin-family nerve agents

Regulatory Information
(only comprehensive for the US)
US EPA Registered: No 
US EPA PC Code: 075203 
Other Information
Molecular Formula: F2-H-K
Manufacturers: BASF, Solvay  
Other Names: 

Basf Pole-Treatment
Bandage, Basf Wood
Preservative Cartridge

Systematic Name
Potassium acid fluoride
Potassium fluoride (K(HF2))
Potassium hydrogendifluoride

Bifluorure de potassium [French]
EINECS 232-156-2
Hydrogen potassium fluoride
Potassium bifluoride
Potassium hydrogen difluoride
Potassium hydrogen fluoride
Potassium monohydrogen difluoride

Of special interest:
PAN Data 
Material Safety Data Sheet. Kingway Chemical.
On line as of January 1, 2002 - Solvay of Germany. Description of Potassium bifluoride as a component of wood preservatives. http://www.solvay.com/fluor/en/download/anorganisch/kaliumhydr.pdf 
2002 - Material Safety Data Sheet for Potassium Hydrogendifluoride ([synonym]). LA-CO INDUSTRIES, Inc./Markal Co. Product Name: SILVER BRAZING FLUX PASTE Revision #: 1.5 Date Prepared: March 1, 1995. Date Revised: August 6, 2002.  

September 1993 - Chemical Weapon Precursor chemicals that are also used as fluorine pesticides. A comparison of the Australia group list of chemical weapon precursors and the CWC schedules of chemicals, by RJ Mathews. Chemical Weapons Convention Bulletin. Issue No. 21. Page 2,

[pesticides highlighted in red]: "... some of the precursor chemicals which are early in the production process and/or are widely produced in industry (and hence not considered suitable for effective monitoring under the CWC [Chemical Weapons Convention]) have been included on the AGL [Australia Group List], because they are either known or suspected to have been sought for CW purposes. Such precursors include: the fluoride chemicals (14 [potassium fluoride], 24 [hydrogen fluoride], 41 [potassium bifluoride], 42 [ammonium bifluoride], 43 [sodium bifluoride] and 44 [sodium fluoride]) for the production of sarin-family nerve agents..." The list of precursor chemicals and their CAS Nos. appear on page 3. Also available at: http://fas-www.harvard.edu/~hsp/bulletin/cwcb21.pdf

1995 - Chemical & Biological Weapons. Fluorine chemicals. 1995 UN Monitoring and Verification of Iraq's Compliance. The organofluorines on this list include (pesticides highlighted in red):
List A (Precursors):
Hydrogen fluoride
Potassium fluoride
Ammonium bifluoride (
Sodium bifluoride
Sodium fluoride
Potassium bifluoride

List B:
PFIB (382-21-8).
Also included are fluoropolymers (e.g. Aflex COP, Aflon COP 88, F 40, Ftorlon, Ftoroplast, Neoflon, ETFE, Teflon, PVDF, Tefzel, PTFE, PE TFE 500 LZ, Haller).
November 2000 - BIOCIDES (II). Refined aquatic environmental risk assessment of 28 priority biocides. B.J.W.G. Mensink. November 2000. RIVM report 601506005. RIVM = Rijksinstituut voor Volksgezondheid en Milieu. National Institute of Public Health and the Environment. http://www.rivm.nl/bibliotheek/rapporten/601506005.pdf  
Inactive wood preservative products - partial list

1954 - A quantum-mechanical discussion of the bifluoride ion. Thesis by Martin Karplus. In partial fulfillment of the requirements for the Degree of Doctor of Philosophy. California Institute of Technology. Pasadena, California. Acknowledgements to several people (including Dr. Linus Pauling) were cited and also: "Generous financial assistance was supplied by the Allied Chemical and Dye Corporation."
Excerpts from Introduction:
... In spite of the recognized importance of the hydrogen bond, no one has given a detailed discussion of the forces involved in its formation. Since the bifluoride ion (FHF) is the simplest hydrogen bonded species, it appears best suited for a theoretical attack.
This thesis is an attempt to develop a semi-theoretical method applicable to highly ionic systems and to apply this method to a treatment of the bifluoride ion. It is hoped that the results contribue to a better understanding of the hydrogen bond and provide an illustration of the power of quantum-mechanical methods in chemistry.

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