Hydrofluoric Acid
Iupac Name:fluorane
Synonym
Caswell No. 484; Etching acid; HFA; Fluorohydric acid; Fluoric acid; Hydrofluoric acid; Aqueous hydrogen fluoride; EPA Pesticide Code: 45601
CAS No.:7664-39-3
Occurrence/Use
Catalyst, reactive solvent; etching glass and enamel; production of refrigerants, herbicides, plastics, and electrical components
Introduction
Hydrofluoric acid (HF) is an aqueous solution of hydrogen fluoride gas.
| Item |
Top-grade |
First grade |
Qualified product |
| HF-40 |
HF-70 |
HF-40 |
HF-55 |
HF-40 |
HF-55 |
| Appearance |
colorless transparent solution |
| Hydrogen fluoride %≥ |
40.0 |
70.0 |
40.0 |
55.0 |
40.0 |
55.0 |
| Fluorosilicic acid %≤ |
0.02 |
0.02 |
0.2 |
0.5 |
2.5 |
5.0 |
| Involatile acid(as H2SO4 ) %≤ |
0.02 |
0.02 |
0.05 |
0.08 |
1.0 |
2.0 |
At room temperature, it appears as colorless transparent to light yellow smoke liquid with pungent odor. It has a specific gravity of 0.98 which is slightly lighter than water. It has a boiling point of 19.4 °C, being highly volatile. It can release white smoke once placed in air. The aqueous solution containing less than 60% hydrogen fluoride appears as a colorless clear fuming liquid. Industrial products are usually aqueous solution containing 40 to 45% HF.
It has pungent odor. It can react with sulfur trioxide or chlorosulfonic acid to generate fluoride sulfonic acid, and can react with halogenated aromatic hydrocarbons, alcohols, olefins, hydrocarbons to generate fluorine-containing organic compound. When being dissolved in water, it can produce highly corrosive acid, being medium-intensity acid. It is extremely smelly, being very toxic and is prone to cause ulceration when get touch with the skin with a severe extent being larger than any acids.
If inhaled of its vapor, it can have fatal effects, thus strict attention should paid during usage.
Hydrofluoric acid can also react with general metals, metal oxides, and hydroxide, generating a variety of metal fluoride salts, but the effect is not as dramatic as hydrochloric acid. Gold, platinum, lead, paraffin and some plastics (polyethylene, etc.) does not react with it and thus being able to be used as containers.
Strong corrosivenes
It can erode glass and silicate to produce gaseous silicon tetrafluoride. The reaction is as follows:
SiO2 + 4HF → H2O + SiF4 ↑,
glass is a silicon compound so the hydrofluoric acid can't be put into glass containers.Hydrofluoric acid can form acid salt, hydrofluoric acid is a monobasic acid, but can produce a series of acid salts such as NaHF2, KHF2, NH4HF2, which are the other three kinds of halogen acid.
The weak acidity of hydrofluoric acid; because of the strong binding capability of hydrogen atom with fluorine atom, hydrofluoric acid can't be completely dissociated in the water. In the hydrohalic acid, only hydrofluoric acid is weak acid (its ionization constant is 3.5 × 10 ^-4; its apparent ionization degree is about 10% at a concentration of 0.1mo1.L^-1, therefore, HF can reluctantly taken as a kind of strong acid. The ionization degree at high concentration is higher than that at low concentration. This property is different from other kinds of general weak electrolytes.
At present, our products have been applied in semiconductor, photovoltaic, high-purity quartz sand, lithium battery electrolyte, stainless steel pickling, graphite purification, rare earth, screen thinning, glass products, electroplating, and other industries.
Our company has established long-term and stable business relations with many listed companies and foreign enterprises, and the product quality and service have won the unanimous praise of customers.
Reliable Hydrofluoric Acid Supplier in China
Reliable Fluorine Chemical Industry Supplier in China
Provide Anhydrous hydrogen fluoride,
49% electronic hydrofluoric acid ,
industrial hydrofluoric acid,
high purity hydrofluoric acid;
hydrofluosilicic acid
Accept customized orders
Usage Scenarios:
stainless steel cleaning
semiconductor fabrication & Stainless steel cleaning
Hydrofluoric acid is used to cleaning stainless steel & Semiconductor wafer
Graphite industry & rare earths industry
Hydrofluoric acid is used in the graphite industry
Glass thinning
Hydrofluoric acid can corrode glass and is used in a variety of glass-thinning scenarios
Purify the high-purity quartz sand
Hydrofluoric acid can be used to pickling high purity quartz sand for further purification
Production of refrigerant
Anhydrous hydrogen fluoride is an important raw material for refrigerant production
Special hydrofluoric acid for the oil field
Hydrofluoric acid is also sometimes used when oil is being extracted
We have over 20 years of professional service experience in the fluorine chemical industry
Quality Control
Customize products according to customer needs, can provide professional product quality testing,
Professional service team
We have a professional production team, quality team, logistics and transportation fleet and after-sales service team
High quality products
Multiple concentrations, multiple packaging specifications
Barket: 25 kg, 230 kg; liquid.
Canned: 1 ton, 1.15 tons; liquid state.
IBC Tank: 20 tons; liquid.
Efficient logistics support
We have a professional fleet that can provide efficient logistics support
Long-term and stable supply
We have over 20 years of service experience in the fluorine chemical industry and can provide you with a long-term and stable supply
Audited Supplier 
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