Acids & Salts Available — Bulk Only

Potassium Fluoride (KF)

CAS 7789-23-3 · Formula FK · MW 58.0967 g/mol

A dry, water-soluble fluoride salt that delivers nucleophilic fluoride for synthesis, brazing flux, and glass-finishing operations. It serves as a fluorine source and base catalyst in organic synthesis, as the active component of silver-soldering and brazing fluxes, and as an etching agent for glass.

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UN Number
UN 1812
Hazard Class
Class 6.1
HS Code
2826.19
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
Biocidal Action · Synthesis Intermediate
Solubility
≥ 100 mg/mL at 19 °C
Functional Roles
POTASSIUM FLUORIDE
ANTIPLAQUEORAL CARE
Applications & Use Cases
  • Organic synthesis: Fluorine source and catalyst for introducing fluorine into organic molecules
  • Brazing & soldering: Active ingredient in silver-soldering and brazing fluxes
  • Glass finishing: Etching and frosting of glass surfaces
  • Chemical processing: Reagent and intermediate
Physical Properties
Melting Point
858 °C
Boiling Point
1505 °C at 760 mmHg
Density
2.48
Solubility
≥ 100 mg/mL at 19 °C
Vapor Pressure
100 Pa (0.75 mm Hg) at 869 °C; 1 kPa (7.5 mm Hg) at 1017 °C; 10 kPa (75 mm Hg) at 1216 °C; 100 kPa (750 mm Hg) at 1499 °C
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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DOT / UN Transport Classification
DOT hazard class 6.1 placard
UN / DOT NumberUN 1812
Hazard Class / DivisionClass 6.1
Packing GroupIII
Proper Shipping NamePotassium fluoride, solid

Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.

HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2826 . 19
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.26
Internationally harmonized (WCO HS)
Subheading 2826.19
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
7789-23-3
Molecular Formula
FK
Molecular Weight
58.0967 g/mol
IUPAC Name
potassium fluoride
INCI Name
POTASSIUM FLUORIDE
PubChem CID
InChI Key
NROKBHXJSPEDAR-UHFFFAOYSA-M
Synonyms & Trade Names
POTASSIUM FLUORIDE Potassium fluorure Potassium fluoride (KF) Fluorure de potassium Kali Fluoratum Potassiumfluoride Potassium fluoride, anhydrous potassium;fluoride Potassium fluoride on calcium fluoride Potassium fluoride anhydrous Potassium fluoride on alumina
Full Description

Potassium fluoride (CAS 7789-23-3) is an inorganic fluoride salt supplied in technical and reagent grades. It serves as a fluorine source and base catalyst in organic synthesis, as the active component of silver-soldering and brazing fluxes, and as an etching agent for glass.

Frequently Asked Questions

What is potassium fluoride used for?

Potassium fluoride (CAS 7789-23-3) is an inorganic fluoride salt used as a fluorine source and base catalyst in organic synthesis, as the active component of silver-soldering and brazing fluxes, and as an etching agent for glass. It is supplied in technical and reagent grades.

What does ACS Reagent grade mean for potassium fluoride?

ACS Reagent grade meets the purity specifications of the American Chemical Society for analytical and laboratory use, with tighter impurity limits than technical grade. We supply this grade with a Certificate of Analysis documenting assay and impurity values per lot.

What is the difference between anhydrous and dihydrate potassium fluoride?

This grade (Ah = anhydrous) contains no water of crystallization, whereas the dihydrate carries two waters. The anhydrous form is preferred where water content must be minimized, such as fluorination reactions. Specify the hydrate state you require when ordering.

How does potassium fluoride ship under DOT regulations?

Potassium fluoride is assigned UN 1812 and is regulated for transport. We ship it with the correct hazard documentation, SDS, and CoA. Confirm your shipping mode so we apply the appropriate packaging and labeling.

What HS code applies to potassium fluoride?

Potassium fluoride classifies under HS 2826.19 (fluorides). We provide the HS code along with the CoA and SDS to support import and customs documentation.

Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.