Product Description of Hydrogen fluoride CAS#7664-39-3
Hydrogen fluoride (HF), alternatively named anhydrous hydrofluoric acid or fluoric acid, is a highly active inorganic acid that features unique silica corrosion and metal dissolution properties. Beyond industrial etching and cleaning, it is also extensively applied in fine chemical synthesis, metallurgical processing, electronic industry and refrigerant production.
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Chemical Properties of Hydrogen fluoride CAS#7664-39-3
| Melting point | -83.4~ -83.6 °C B3 |
| Boiling point | 19.5 °C at 760 mmHg (anhydrous) |
| Density | 0.991 g/mL at 19.54 °C |
| vapor density | 1.27 (vs air) |
| vapor pressure | 922 mmHg at 25 °C; 774.8 mmHg at 20 °C |
| refractive index | 1.335 (anhydrous liquid at 20 °C) |
| storage temp. | 2-8 °C / 2-30 °C, sealed in cool, dry, ventilated steel cylinder away from glass, siliceous materials, metals and strong alkalis |
| solubility | Freely miscible with water, ethanol; insoluble in most organic non-polar solvents |
| Physical Form | Colorless fuming liquid below 19.5 °C; colorless pungent gas above boiling point |
| Color | Colorless, may appear faint light yellow with industrial impurities |
| Odor | Strong, sharp, highly irritating pungent odor |
| Odor Threshold | 0.5 ppm in air |
| Water Solubility | Freely miscible (100% soluble, violent exothermic dissolution) |
| Merck | 14, 4858 |
| Henry's Law Constant | 5.20×10⁻⁵ atm·m³/mol at 25 °C |
| Exposure limits | NIOSH REL-TWA 2 ppm (2.5 mg/m³, as F); ACGIH TLV-TWA 0.5 ppm (0.62 mg/m³, as F); OSHA PEL-TWA 3 ppm (2.5 mg/m³, as F) |
| Dielectric constant | 84 at 0 °C (anhydrous liquid) |
| CAS DataBase Reference | 7664-39-3 |
Safety Information of Hydrogen fluoride CAS#7664-39-3
| Hazard Codes | T+,C,T,Xn |
| Risk Statements | 26/27/28-35-36/37/38-20/21/22 |
| Safety Statements | 26-36/37/39-45-7/9-36/37-28-36 |
| OEB | B |
| OEL | TWA: 3 ppm (2.5 mg/m3), Ceiling: 6 ppm (5 mg/m3) [15-minute] |
| RIDADR | UN 1052 8/PG I (HYDROGEN FLUORIDE, ANHYDROUS) |
| RIDADR | UN 1790 8/PG I (HYDROFLUORIC ACID, with more than 60 % hydrogen fluoride) |
| RIDADR | UN 1790 8/PG II (HYDROFLUORIC ACID, with not more than 60 % hydrogen fluoride) |
| WGK Germany | 2 |
| RTECS | MW7875000 |
| Hazard Note | Corrosive |
| TSCA | TSCA listed |
| DOT Classification | 8, Hazard Zone C (Corrosive material) |
| HazardClass | 8 |
| PackingGroup | II |
| HS Code | 28111100 |
| Storage Class | 6.1B - Non-combustible, acute toxic Cat. 1 and 2 very toxic hazardous materials |
| Hazard Classifications | Acute Tox. 1 Dermal Acute Tox. 2 Inhalation Acute Tox. 2 Oral Eye Dam. 1 Skin Corr. 1A |
| Hazardous Substances Data | 7664-39-3(Hazardous Substances Data) |
| Toxicity | LC50 (15 min.) in rats, guinea pigs: 2689, 4327 ppm (Rosenholtz) |
| IDLH | 30 ppm |
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Product Application of Hydrogen fluoride CAS#7664-39-3
Hydrogen fluoride is a high-activity inorganic acid that is effective against silica and oxide substances and has strong corrosive potential in industrial processing. Its reaction effectiveness depending on the concentration and pH of the formulation.
In industrial applications, hydrogen fluoride can be used as an alternative to in industrial etching, purification, and various chemical reaction formulations. It is mainly produced through standardized synthetic industrial processes.
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