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Fluoroboric acid

Outline Toxicity Chemical Properties Uses Production method Category Toxicity grading Flammability hazard characteristics Storage Characteristics Extinguishing agent Professional standards
Fluoroboric acid
Fluoroboric acid structure
Chemical Name:
Fluoroboric acid
en tetrafL;fluoroboric;borofluorid;FLUOBORIC ACID;Borofiuoric acid;BOROFLUORIC ACID;FLUOROBORIC ACID;Hydrogen tetrafL;fluoboricacid[qr];fluoroborate acid
Molecular Formula:
Formula Weight:
MOL File:

Fluoroboric acid Properties

Melting point:
Boiling point:
130°C (dec.)
1.38 g/mL at 20 °C(lit.)
vapor density 
3 (vs air)
vapor pressure 
5 mmHg ( 20 °C)
refractive index 
nD20 of a 20% aq soln 1.3284
Flash point:
−40 °F
Light Yellow
Water Solubility 
Stable. Incompatible with strong bases, cyanides.
CAS DataBase Reference
16872-11-0(CAS DataBase Reference)
EWG's Food Scores
EPA Substance Registry System
Fluoroboric acid (16872-11-0)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H314-H301-H318
Precautionary statements  P260h-P301+P310a-P405-P501a-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338
Hazard Codes  C
Risk Statements  34
Safety Statements  26-36/37/39-45-37-27
RIDADR  UN 1775 8/PG 2
WGK Germany  1
RTECS  ED2685000
Hazard Note  Corrosive
HazardClass  8
PackingGroup  II
HS Code  28111990
NFPA 704
3 0

Fluoroboric acid price More Price(10)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 207934 Tetrafluoroboric acid solution 48 wt. % in H2O 16872-11-0 25g $57.5 2021-03-22 Buy
Sigma-Aldrich 207934 Tetrafluoroboric acid solution 48 wt. % in H2O 16872-11-0 500g $116 2021-03-22 Buy
Alfa Aesar 011484 Tetrafluoroboric acid, 48% min w/w aq. soln. 16872-11-0 *4x500g $167 2021-03-22 Buy
Alfa Aesar 011484 Tetrafluoroboric acid, 48% min w/w aq. soln. 16872-11-0 50g $42.8 2021-03-22 Buy
Strem Chemicals 93-0503 Tetrafluoroboric acid, 48% aqueous solution 16872-11-0 500g $69 2021-03-22 Buy

Fluoroboric acid Chemical Properties,Uses,Production


Fluoroboric acid is also known as "hydrogen fluoroboric acid," "tetrafluoroborate boron-hydrogen acid." Chemical formula is HBF4. Molecular weight is 87.81. It is transparent colorless liquid, toxic, has a strong corrosion, it can not be stored in a glass container for a long time. Boiling point is 130 ℃, while it decomposes slowly. Dissolved in water and ethanol, thermal decomposition with water to generate oxygen fluorine boric acid and boron trioxide (may be concentrated to 30%), the solution was strongly acidic, it does not corrode glass at room temperature. Fluoroboric acid is a strong acid, only exists in solution, the common fluoroborate is potassium tetrafluoroborate.
Method: Can be prepared by the reaction of Concentrated hydrofluoric acid and boric acid.
Uses: used in light metal smelting and electroplating, etc. Even very dilute solution can also be used as fermentation inhibitors, also used for preparing diazonium salts, acetal catalyst, used as an agent for determination of sodium in the presence of magnesium and potassium ions. Aniline as raw materials in concentrated hydrochloric acid reacts with sodium nitrite to generate diazonium salt, then at a low temperature (-10 ℃), diazonium salt reacts with fluoroboric acid, final pyrolysis, can be prepared fluorophenyl.
The above information is edited by the chemicalbook of Yan Yanyong.


It has a strong corrosive effect on the skin, mucous membrane, has a irritative effect on the eyes and respiratory system. Even diluted to be very thin, it can hinder fermentation. Maximum allowable concentration is 2.5 mg/m3. If accidentally splashed on the eyes or body, flush eyes with water, wash contaminated body parts thoroughly with soap and water. In severe cases, sent the patient to the hospital. The operator must wear masks, rubber gloves and wear overalls.

Chemical Properties

Transparent colorless liquid. miscible with water or alcohol.


Used as acetaldehyde synthesis catalysts, the metal surface cleaning agents, lead electrolytic polishing agents, the diazonium salt stabilizer, etc.
Used as Diazonium salts stabilizer, but also for electrolysis industry, etc.
Used for cleaning metal surface oxide, silicate film and as a corrosive, for cleaning before aluminum and alloy electroplating. 2.5% solution is for electrolytic polishing of pure aluminum and used as rewashing lotion for removing flux and electroplating parts from the metal substrate, as a catalyst for alkylation and polymerization, preservatives, chemical reagents, as well as the starting materials for preparing various fluoborates.
Used to clean metal and alloy surfaces prior to plating.
Used for preparing stabilized diazonium salts, manufacturing acetal catalyzed, used as an agent for determination of sodium in the presence of potassium ions and magnesium ions, a catalyst in organic synthesis, but also used for the sponge titanium and its alloys-dissolution and the printed wiring board industry.

Production method

Hydrofluoric acid method is according to the theoretical amount of hydrofluoric acid and boric acid ingredients, slowly adding boric acid to hydrofluoric acid under stirring, the reaction temperature was controlled below 40 ℃, stop mechanical stirring upon heating completed, placed at room temperature for more than 2h, then filtered and purified to obtain fluoroborate finished production.
4HF + H3BO3 → HBF3OH + HF + 2H2O
HBF3OH + HF → HBF4 + H2O


Corrosive materials

Toxicity grading


Flammability hazard characteristics

In case of hair H combustible pore-forming agent; thermal decomposition of toxic fluoride gas.

Storage Characteristics

Treasury ventilation low-temperature drying, stored separately from Cyanide, 3,7-dinitroso-1,3,5,7-tetraazobicyclo-nonane, alkalis.

Extinguishing agent

Sand, carbon dioxide

Professional standards

TWA 2.5 mg (fluorine)/cubic meter

Chemical Properties

Fluoboric acid is a colourless liquid, completely solvable in water. Fluoboric acid is a stable chemical substance and extremely reactive or incompatible with strong bases, cyanides. It is very corrosive in the presence of steel, aluminium, zinc, and copper and highly corrosive in the presence of glass and stainless steel.

Chemical Properties

Fluoboric acid is a colorless liquid which does not exist as a free, pure substance. Used as an aqueous solution.


As catalyst for preparing acetals, esterifying cellulose; to clean metal surfaces before welding; to brighten aluminum; as a solute in electrolytes for plating metals such as chromium, iron, nickel, copper, silver, zinc, cadmium, indium, tin, and lead (has a high throwing power). Reagent for sodium in the presence of magnesium and potassium ions; for making stabilized diazo salts (diazonium and tetrazonium fluoborates). An 0.1 to 0.5% solution retards fermentation: Homeyer, Pharm. Ztg. 34, 761 (1889).

General Description

A colorless odorless poisonous liquid. Boiling point 130°C. Corrosive to metals and tissue. Fluoroboric acid is used in electroplating, metal cleaning and making diazo salts.

Air & Water Reactions

Soluble in water with release of heat.

Reactivity Profile

Fluoroboric acid is a strong acid. Reacts exothermically with chemical bases (examples: amines, amides, and inorganic hydroxides). These reactions can generate dangerously large amounts of heat in small spaces. Dissolution in water or the dilution of a concentrated aqueous solution may generate significant heat. Reacts with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas. Can initiate the polymerization of certain alkenes. Reacts with cyanide compounds to release gaseous hydrogen cyanide. Generates flammable and/or toxic gases in contact with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and strong reducing agents. Additional gas-generating reactions occur with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), and carbonates. May catalyze (increase the rate of) chemical reactions. Attempted drying of the acid with acetic anhydride caused an explosion at 0°C [J. Organomet. Chem., 1975, 94, 319].


Highly toxic, corrosive, irritant.

Health Hazard

TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.

Safety Profile

A corrosive acid. When heated to decomposition it emits toxic vapors of B and F-.

Potential Exposure

Used as a catalyst for acetal synthesis and cellulose esters; a metal surface cleaning agent; an alu minum electrolytic finishing agent; a stripping solution for the removal of solder and plated metals; and an intermedi ate in making fluoroborate salt.


UN1775 Fluoroboric acid, Hazard class: 8; Labels: 8-Corrosive material.

Purification Methods

Crystallise fluoroboric acid several times from conductivity water. It can be stored in a glass vessel at room temperature. [Kwasnik in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I pp 221-222 1963.]


A strong acid. Reacts violently with chemically active metals; strong bases, releasing flammable hydrogen gas.

Fluoroboric acid Preparation Products And Raw materials

Raw materials

Preparation Products

Fluoroboric acid Suppliers

Global( 277)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Tangshan Moneide Trading Co., Ltd.
86-315-8309571 15633399667 CHINA 545 58
Henan DaKen Chemical CO.,LTD.
+86-371-66670886 China 21032 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22607 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 3001 55
career henan chemical co
+86-371-86658258 CHINA 29961 58
Hubei Jusheng Technology Co.,Ltd.
027-59599243 CHINA 28229 58
Hubei xin bonus chemical co. LTD
027-59338440 CHINA 23035 58
Chongqing Chemdad Co., Ltd
+86-13650506873 CHINA 37282 58
86-18523575427 CHINA 47496 58
Zhengzhou Alfa Chemical Co.,Ltd
+86 13343822234;;; CHINA 3270 58

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View Lastest Price from Fluoroboric acid manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-07-06 Fluoroboric acid
US $1.00 / kg 1kg 95%-99% 100kg career henan chemical co

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