tetrafluorosilane dihydrofluoride
Fluorosilicic acid
CAS: 16961-83-4
Molecular Formula: F6H2Si
tetrafluorosilane dihydrofluoride - Names and Identifiers
tetrafluorosilane dihydrofluoride - Physico-chemical Properties
| Molecular Formula | F6H2Si |
| Molar Mass | 144.09 |
| Density | 1.22 g/mL at 20 °C (lit.)1.31 g/mL at 25 °C |
| Boling Point | 108-109°C |
| Flash Point | 108-109°C |
| Water Solubility | Miscible with water. |
| Solubility | H2O: 1mg/mL, clear, colorless |
| Vapor Presure | 23hPa at 19.85℃ |
| Appearance | Liquid |
| Specific Gravity | 1.38 (40%) |
| Color | Clear colorless |
| Exposure Limit | ACGIH: TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 |
| Merck | 14,4182 |
| pKa | 1.83[at 20 ℃] |
| Storage Condition | −20°C |
| Stability | Stable in aqueous solution. |
| Sensitive | 0: forms stable aqueous solutions |
| Refractive Index | 1.3500 |
| Physical and Chemical Properties | The aqueous solution is a colorless and transparent fuming liquid. Irritating odor, volatile. |
| Use | Mainly used in the production of fluorine silicate, silicon tetrafluoride, also used in electroplating, Wood corrosion, brewing industry equipment Disinfection, water additives |
tetrafluorosilane dihydrofluoride - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R34 - Causes burns R35 - Causes severe burns R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S27 - Take off immediately all contaminated clothing. |
| UN IDs | UN 1778 8/PG 2 |
| WGK Germany | 3 |
| RTECS | VV8225000 |
| FLUKA BRAND F CODES | 8-10 |
| TSCA | Yes |
| HS Code | 28111990 |
| Hazard Note | Corrosive |
| Hazard Class | 8 |
| Packing Group | II |
| Toxicity | LD50 oral in rat: 430mg/kg |
tetrafluorosilane dihydrofluoride - Upstream Downstream Industry
tetrafluorosilane dihydrofluoride - Nature
Open Data Verified Data
Golden or orange-red crystals. d about 3.9. Deliquescence. Soluble in water, ethanol, soluble in ether, slightly soluble in chloroform. Black spots appeared in light.
Last Update：2024-01-02 23:10:35
tetrafluorosilane dihydrofluoride - Preparation Method
Open Data Verified Data
The gold powder (or foil) was dissolved in an aqueous solution of nitric acid or hydrochloric acid (aqua regia). Evaporation to a certain extent, plus a small amount of hydrochloric acid, and the introduction of chlorine, stirring, cooling, prepared crystals, dried for pure gold chloride.
Last Update：2022-01-01 09:01:57
tetrafluorosilane dihydrofluoride - Use
Open Data Verified Data
as an analytical reagent, rubidium and cesium were microanalyzed and alkaloids were measured. It can also be used in the manufacture of red glass, electroplating and photography.
Last Update：2022-01-01 09:01:57
tetrafluorosilane dihydrofluoride - Safety
Open Data Verified Data
This product is toxic. Oral administration of lg is lethal. The local effect is similar to that of hydrofluoric acid, but weaker. Protection Measure see hydrogen fluoride. Packed with polyethylene plastic barrel, coat the wooden box. Net weight per barrel: 20kg, 25kg. Package should be marked with "highly toxic drugs" and "corrosive substances"
Sign. Should be stored in a cool, ventilated warehouse. Storage temperature should not exceed 30 ℃, and should not be stored under sunlight and high temperature. Protection against rain and sun exposure during transport. Handling should be careful to prevent packaging rupture. It is strictly prohibited to store alkali and other easily corrosive articles. Class I inorganic acid corrosion articles, risk code: GB 8.1 class 810250 UN N0.1778, IMDG CODE8176 page 8.1 class.
Last Update：2022-01-01 11:01:11
tetrafluorosilane dihydrofluoride - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| inorganic fluorine bactericide | fluosilicic acid is an inorganic fluorine bactericide. The original drug is colorless zona pellucida acid solution, which is formed by the interaction of silicon tetrafluoride and water. In the production of calcium superphosphate, apatite and sulfuric acid, the acidification reaction release hydrogen fluoride, through multiple cycles of cold water absorption of fluorosilicic acid aqueous solution, rust, black powder bacteria, other mold has a strong bactericidal effect. Foliar spraying has protective and eradication effects. Two weeks of residual effect, fluosilicic acid and urea (1:4) mixed into fluorosilicon urine is also an agricultural fungicide, the agent is corrosive, has a stimulating effect on human skin, but also easy to produce plant damage. |
| Chemical reaction | fluorosilicic acid can be prepared by reacting hydrofluoric acid with silicon tetrafluoride or silica: siF4 + 2HF = H2SiF6SiO2 + 6HF = H2SiF6 + 2H2O Silicon tetrafluoride is hydrolyzed, and silicic acid gel can also be filtered to obtain fluorosilicic acid. So far, pure acid has not been prepared, and its aqueous solution is stable. At room temperature, the dilute solution can be stored in glass bottles. It is a strong coordination acid (with the strength of sulfuric acid), easy to react with alkali to produce fluorosilicate. H2SiF6 + 2NaOH = Na2SiF6 + 2H2O Silicon tetrafluoride combined with fluoride also produces fluorosilicate: SiF6 + 2KF = K2SiF6 fluorosilicic acid and its salts are toxic. Dilute solutions of fluorosilicic acid are used as disinfectants in beer production. Sodium fluorosilicate can be used as an insecticide for agricultural crops, a preservative for wood, and a cream for enamel. Potassium fluorosilicate can be made of solar grade pure silicon (99.97%). Because the alkali metal (except lithium) and barium fluoride silicate is difficult to dissolve in water, fluorine silicate is also used in the preparation of perchloric acid, hydrogen peroxide and other substances. For example, 2 kclo4 + H2SiF6 = K2SiF6 ↓ +2 hclo4bao2 + H2SiF6 = BaSiF6 ↓ + H2O2. |
| toxicity | This product is toxic. 1G can be fatal. The local effect is similar to that of hydrofluoric acid, but weaker. Protection Measure see hydrogen fluoride. |
| purpose | used as analytical reagent, also used in the synthesis of silicate is the preparation of sodium, potassium, ammonium, magnesium, basic materials for copper, barium, lead, and other fluorosilicates and silicon tetrafluoride. For metal plating, wood preservation, beer Disinfection, brewing industry equipment Disinfection (1%~ 2%H2SiF6) and lead electrolytic refining. It is also used as mordant and metal surface treatment agent. mainly used in the production of fluorosilicate, silicon tetrafluoride, also used in electroplating, wood preservation, brewing industry equipment Disinfection, water additives, etc. determination of barium, separation of barium and strontium. |
| production method | acid hydrolysis of silica powder hydrofluoric acid was added to the lead-lining acid hydrolysis equipment, and then silica powder was gradually added to react. After the reaction is completed, the rice bran ash is added to neutralize the free hydrofluoric acid, and at the same time, the solution is bleached, and the solution is filtered, and an appropriate amount of yellow powder (PbO) is added to the filtered clear solution. To remove the hydrofluoric acid into the sulfate group, and then filtered to produce fluorosilicic acid product. 6HF SiO2 → H2SiF6 2H2O |
| category | corrosive article |
| toxicity grade | high toxicity |
| Acute toxicity | subcutaneous-frog LDL0: 140 mg/kg |
| flammability hazard characteristics | toxic hydrogen fluoride gas generated by thermal decomposition |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from food additives and alkalis |
| extinguishing agent | dry sand, dry stone powder, carbon dioxide, foam |
| Occupational Standard | TWA 2.5 mg (fluorine)/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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View History
Raw Materials for tetrafluorosilane dihydrofluoride
Downstream Products for tetrafluorosilane dihydrofluoride
Potassium Tetrafluoroborate
sodium tetrafluoroborate
ammonium fluoroborate
Aluminum fluoride
sodium hexafluorosilicate
potassium hexafluorosilicate
Zinc fluorosilicate
Magnesium hexafluorosilicate
sodium hexafluorosilicate
sodium tetrafluoroborate
ammonium fluoroborate
Aluminum fluoride
sodium hexafluorosilicate
potassium hexafluorosilicate
Zinc fluorosilicate
Magnesium hexafluorosilicate
sodium hexafluorosilicate