Hexafluorophosphoric acid solution
Hexafluorophosphoric acid solution (CAS: 16940-81-1, Formula: HPF6) is a strong inorganic acid supplied by Tech Serve Solutions at approximately 55 wt.% concentration in water. With a molecular weight of 145.97 g/mol, it is a corrosive and toxic liquid. Its primary applications lie in chemical synthesis, as an electrolyte component in various electrochemical systems, and in materials science for surface treatments and etching processes.
- IUPAC
- Hydrogen hexafluorophosphate

Electrolyte Component
Hexafluorophosphoric acid serves as a key component in electrolytes for batteries and capacitors, contributing to ionic conductivity and electrochemical stability. It is particularly relevant in the development of advanced energy storage devices.
Chemical Synthesis
This strong acid is employed as a reagent or catalyst in various organic and inorganic synthesis reactions. Its potent acidic nature facilitates reactions requiring protonation or Lewis acid catalysis.
Materials Science and Etching
In materials science, hexafluorophosphoric acid is utilized for surface preparation, etching, and cleaning of various substrates, particularly in the microelectronics industry. Its ability to dissolve certain metal oxides is advantageous in these processes.
Catalysis
As a strong Brønsted acid, HPF6 can act as an effective catalyst in various chemical transformations. It is particularly useful in reactions where a non-nucleophilic counterion is desired.
| Molecular weight | 145.97 |
|---|---|
| Linear formula | HPF6 |
| Density | 1.651 g/mL at 25 °C |
| Concentration | ~55 wt. % in H2O |
| Storage temperature | 2-8°C |


Hazard statements
- H300Fatal if swallowed
- H310Fatal in contact with skin
- H314Causes severe skin burns and eye damage
- H331Toxic if inhaled
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P264Wash thoroughly after handling
- P280Wear protective gloves, clothing and eye/face protection
- P301IF SWALLOWED
- P302IF ON SKIN
- P305IF IN EYES
| Protective equipment | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Transport (UN / ADR) | UN 1782 8 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T+,C |
| Risk statements (R) | 26/27/28-35 |
| Safety statements (S) | 26-28-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Hexafluorophosphoric acid solution used for?
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Hexafluorophosphoric acid solution is used in chemical synthesis, as an electrolyte component in electrochemical systems, and in materials science for surface treatments and etching processes.
What are the CAS number and chemical formula for Hexafluorophosphoric acid solution?
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The CAS number is 16940-81-1, and the chemical formula is HPF6.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Hexafluorophosphoric acid solution at approximately 55 wt.% in water. This product is intended for technical and research purposes, and TSS does not represent it as USP, BP, or EP grade.
How should Hexafluorophosphoric acid solution be handled?
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Hexafluorophosphoric acid solution is dangerous, causing severe skin burns and eye damage, and is toxic if swallowed, in contact with skin, or if inhaled. Handle with extreme care using appropriate personal protective equipment, including face shields, gloves, and respiratory protection, in a well-ventilated area. Consult the Safety Data Sheet for detailed handling procedures.
How is Hexafluorophosphoric acid solution packed, shipped, and exported?
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Hexafluorophosphoric acid solution is classified under UN 1782, hazard class 8, with packing group II, indicating it is a corrosive and toxic substance. TSS ensures compliance with all regulations for safe packing, shipping, and export.
How can I request a sample or quote for Hexafluorophosphoric acid solution?
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To request a sample or quote for Hexafluorophosphoric acid solution, please contact our sales team through the TSS website or by calling our office.
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