Substance profile
Tetrafluoroboric acid
Tetrafluoroboric acid is a colorless liquid.
01 · Identification
What Tetrafluoroboric acid is
Tetrafluoroboric acid is a colorless liquid. Its molecular formula is BF4H and its molecular weight is 87.82 g/mol. It boils at 130 °C, is very soluble in water.
Under the GHS it carries the signal word Danger. It is classed as corrosives.
02 · Identifiers
Tetrafluoroboric acid identifiers and molecular data
Tetrafluoroboric acid CAS number and EC number
Tetrafluoroboric acid molecular formula and molecular weight
Other names for Tetrafluoroboric acid
- fluoroboric acid ... %
03 · GHS classification
Tetrafluoroboric acid hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Tetrafluoroboric acid pictograms and signal word
Tetrafluoroboric acid hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Tetrafluoroboric acid hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H314 | Causes severe skin burns and eye damage. |
This page lists only the codes assigned to Tetrafluoroboric acid. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Tetrafluoroboric acid
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Tetrafluoroboric acid issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Tetrafluoroboric acid precautionary statements
CLP Annex VI assigns 5 precautionary statements to Tetrafluoroboric acid. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Tetrafluoroboric acid name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | флуороборна киселина … % |
| Spanish español | Ácido fluorobórico al … % |
| Czech čeština | kyselina tetrafluoroboritá … % |
| Danish dansk | flourborsyre … % |
| German Deutsch | Borfluorwasserstoffsäure … % Tetrafluorborsäure … % |
| Estonian eesti | fluoroboorhape … % |
| Greek ελληνικά | φθοροβορικό οξύ … % |
| English English | fluoroboric acid … % |
| French français | acide fluoroborique à … % |
| Croatian hrvatski | fluoroborna kiselina … % |
| Italian italiano | acido fluoborico …% |
| Latvian latviešu | fluorborskābe … % |
| Lithuanian lietuvių | … % fluorboro rūgštis |
| Hungarian magyar | fluorbórsav … % |
| Maltese Malti | aċidu fluworoboriku … % |
| Dutch Nederlands | tetrafluorboorzuur … % |
| Polish polski | kwas tetrafluoroborowy … % |
| Portuguese português | ácido fluorobórico a ... % |
| Romanian română | acid fluoroboric ... % |
| Slovak slovenčina | kyselina tetrafluoroboritá ... % |
| Slovenian slovenščina | fluoroborova kislina ... % |
| Finnish suomi | fluoriboorihappo… % |
| Swedish svenska | fluorborvätesyra ... % |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Tetrafluoroboric acid GHS label elements
Everything CLP Annex VI fixes for Tetrafluoroboric acid, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Tetrafluoroboric acid
- Causes severe skin burns and eye damage.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- Immediately call a POISON CENTER/doctor/…
- Do NOT induce vomiting.
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Tetrafluoroboric acid in the GHS label constructor →
07 · Health hazards
Tetrafluoroboric acid health hazards and exposure limits
Tetrafluoroboric acid hazard summary
Solutions 30-70% are corrosive to skin; [Quick CPC] High inhalation exposure can cause pulmonary edema; [ICSC] Reacts with water evolving heat; Corrosive to tissue; [CAMEO] Not stored in bone, like the F- ion, because excretion is more rapid than hydrolysis; Causes burns to skin and eye; Inhalation may cause pulmonary edema; [IUCLID] Causes somnolence and ataxia in oral lethal-dose studies of mice and rats; [RTECS] Causes burns; Inhalation may cause corrosive injuries to upper respiratory tract and lungs; [Alfa Aesar MSDS]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · Physical and chemical properties
Tetrafluoroboric acid properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
Tetrafluoroboric acid boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 130 °C (266 °F) | decomposes | HSDB |
Tetrafluoroboric acid density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.8 g/cm³ | HSDB | |
| 1.4 g/cm³ | ICSC | ||
| 1.84 g/cm³ | at 25 °C | DOE PAC |
Tetrafluoroboric acid solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Very soluble in water, ethanol | HSDB |
Tetrafluoroboric acid vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 5 mmHg | Haz-Map |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Handling and storage
Tetrafluoroboric acid storage and handling
Tetrafluoroboric acid safe storage
Separated from strong bases, metals and food and feedstuffs. Well closed. Ventilation along the floor. Store only in original container. Do NOT store or transport in containers made from metal or glass. Store in an area without drain or sewer access.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Tetrafluoroboric acid storage conditions
Separated from strong bases, food and feedstuffs. Well closed. Ventilation along the floor. /table/
Source: Hazardous Substances Data Bank (HSDB)
Tetrafluoroboric acid incompatible materials
Interaction of ... /hexafluorisopropylideneaminolithium/ with a range of chloro- and fluoro-derivatives of boron ... during warming to 25 °C tended to be violently exothermic in absence of solvent.
Source: Hazardous Substances Data Bank (HSDB)
Planning storage for a mix of chemicals? Check Tetrafluoroboric acid in the storage compatibility matrix →
10 · Transport
Tetrafluoroboric acid UN number and transport classification
Transport classification is a separate system from the GHS classification above. It decides how a package is marked and how a load may be carried; it does not follow from the workplace label, and the workplace label does not follow from it. The entries below are linked by CAS number, never by name.
Tetrafluoroboric acid under UN 1775 — shipping name, class and packing group
Europe · ADR 2025, Table A
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels (column 5) |
|---|---|---|---|---|
| FLUOROBORIC ACID | 8 | C1 | II | |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 8 is “Corrosive substances” (ADR 2.1.1.1).
United States · 49 CFR 172.101 Hazardous Materials Table
| Proper shipping name (column 2) | Class or division | PG | Labels (column 6) |
|---|---|---|---|
| Fluoroboric acid | 8 | II | |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 8 is “Corrosive material” (49 CFR 173.2).
11 · Questions
Tetrafluoroboric acid — frequently asked questions
What is the CAS number of Tetrafluoroboric acid?
The CAS number of Tetrafluoroboric acid is 16872-11-0. Its EC number is 240-898-3.
What is the chemical formula of Tetrafluoroboric acid?
The molecular formula of Tetrafluoroboric acid is BF4H and its molecular weight is 87.82 g/mol.
What does a Tetrafluoroboric acid label have to show?
Under CLP Annex VI the label for Tetrafluoroboric acid carries the pictogram Corrosion and the signal word is Danger.
Is Tetrafluoroboric acid flammable?
CLP Annex VI assigns Tetrafluoroboric acid no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Tetrafluoroboric acid a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Tetrafluoroboric acid. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the boiling point of Tetrafluoroboric acid?
The boiling point reported for Tetrafluoroboric acid is 130 °C (266 °F), decomposes (HSDB).
How should Tetrafluoroboric acid be stored?
Separated from strong bases, food and feedstuffs. Well closed. Ventilation along the floor. /table/ (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to Tetrafluoroboric acid
Keep going: substances starting with T, or search the whole database by name, CAS number, pictogram or signal word.