Tetrafluoroboric acid
CAS 16872-11-0
EC 240-898-3
Formula BF4.H
MW 63.82 g/mol
Inorganic Acids Mining & MetalsLubricants & MetalworkingPlastics & PolymersElectronics CatalysispH Regulation & BufferingCorrosion Inhibition
Description
Tetrafluoroboric acid (CAS 16872-11-0, EC 240-898-3), also known as fluoboric acid or borofluoric acid, is an inorganic acid supplied exclusively as an aqueous solution. It carries no E-code designation and is classified under HS code 28111990 within the inorganic acids category.
In electronics manufacturing, tetrafluoroboric acid serves as an electrolyte in tin and lead electroplating baths, where fluoroborate ions stabilise metal deposition at controlled rates. In mining and metals processing, it acts as a pH regulator and catalyst in flux formulations, facilitating oxide removal from metal surfaces prior to soldering or coating operations.
Tetrafluoroboric acid is available in technical and high-purity grades as aqueous solutions of varying concentration, typically ranging from 40% to 50% w/w. The substance is registered under REACH and subject to standard industrial handling classifications. Packaging is available in drums and intermediate bulk containers to suit procurement volumes.
In electronics manufacturing, tetrafluoroboric acid serves as an electrolyte in tin and lead electroplating baths, where fluoroborate ions stabilise metal deposition at controlled rates. In mining and metals processing, it acts as a pH regulator and catalyst in flux formulations, facilitating oxide removal from metal surfaces prior to soldering or coating operations.
Tetrafluoroboric acid is available in technical and high-purity grades as aqueous solutions of varying concentration, typically ranging from 40% to 50% w/w. The substance is registered under REACH and subject to standard industrial handling classifications. Packaging is available in drums and intermediate bulk containers to suit procurement volumes.
Physical Properties
| Melting Point | -90°C |
| Boiling Point | 130°C (dec.) |
| Density | ~1.84 g/cm³ (approx) |
| Flash Point | −40 °F |
| Appearance | Fluoboric acid is a colorless liquid which does not exist as a free, pure substance. Used as an aqueous solution. |
| Color | Light Yellow |
| Odor | Odorless |
| Form | Liquid |
| Water Solubility | MISCIBLE |
| Vapor Pressure | 5 mmHg ( 20 °C) |
| Refractive Index | nD20 of a 20% aq soln 1.3284 |
Safety & Handling (Learn More)
Danger GHS05 GHS06 GHS07 GHS08
H
H290H301H311H314H318H335H336H371H372
P
P234P260P261P262P264P270P271P280P316P317P319P321P330P363P390P405P406P501P264+P265P301+P316P302+P352P304+P340P308+P316P361+P364P403+P233P301+P330+P331P302+P361+P354P305+P354+P338
Trade & Regulatory
| HS Code | 28111990 |
| UN Number | 1775 |
| ADR Class | 8 |
| Packing Group | II |
| Storage Class | 8B - Non-combustible corrosive hazardous materials |
| WGK (Germany) | 1 |
Other Names
hydron tetrafluoroborateHBF4fluoboric acidfluoroboric acidborofluoridBorofluoric acid
Related Products
Raw Materials
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