16893-85-9
sodium hexafluorosilicate
CAS: 16893-85-9
Molecular Formula: F6Na2Si
16893-85-9 - Names and Identifiers
16893-85-9 - Physico-chemical Properties
| Molecular Formula | F6Na2Si |
| Molar Mass | 188.06 |
| Density | 2.68g/mLat 25°C(lit.) |
| Melting Point | melts at red heat, decomposing [MER06] |
| Boling Point | 620℃[at 101 325 Pa] |
| Water Solubility | Slightly soluble in water. Solubility increases with temperature. Insoluble in alcoholSlightly soluble in water. Insoluble in alcohol. |
| Vapor Presure | 0.01Pa |
| Appearance | Crystals |
| Specific Gravity | 2.68 |
| Color | White |
| Exposure Limit | ACGIH: TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 |
| Merck | 14,8624 |
| Stability | Stable. Incompatible with oxidizing agents, water. Moisture sensitive. |
| Refractive Index | 1.310 |
| Physical and Chemical Properties | Character: colorless hexagonal crystal. Odorless and tasteless. Hygroscopic. relative density 2.679 solubility: soluble in solvents such as ether, insoluble in alcohol. The solubility in acid is greater than in water. |
| Use | Used as pesticides, adhesives, also used in ceramics, glass, enamel, wood anti-corrosion, medicine, water treatment, leather, rubber and sodium fluoride |
16893-85-9 - Risk and Safety
| Risk Codes | 23/24/25 - Toxic 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. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 2674 6.1/PG 3 |
| WGK Germany | 2 |
| RTECS | VV8410000 |
| TSCA | Yes |
| Hazard Note | Irritant |
| Hazard Class | 6.1 |
| Packing Group | III |
| Toxicity | LD in rabbits (mg F/kg): 76 intragastric; in rats (mg F/kg): 42 s.c. (Muehlberger); LD in guinea pigs (mg/kg): 250 orally, 500 s.c. (Waldbott) |
16893-85-9 - Upstream Downstream Industry
16893-85-9 - Nature
Open Data Verified Data
colorless hexagonal crystal. Odorless and tasteless. Hygroscopic. The relative density was 2. 679. Soluble in ether and other solvents, insoluble in alcohol. The solubility in acid is greater than in water. In the alkali solution decomposition, generation of fluoride and silica. After burning (at 300 °c), it decomposes into sodium fluoride and silicon tetrafluoride. Toxic!
Last Update：2024-01-02 23:10:35
16893-85-9 - Preparation Method
Open Data Verified Data
calcium superphosphate by-production method: a fluorine-containing waste gas that escapes during the production of calcium superphosphate or the extraction of phosphoric acid by the reaction of phosphate rock powder and sulfuric acid is made into fluorosilicic acid by absorbing silicon tetrafluoride with water. When the concentration of fluorosilicic acid solution reaches 8%~ 10%, static clarification, removal of impurities, clarification of fluorosilicic acid
Sodium chloride (about 25% excess) is added to the solution to react to generate sodium fluosilicate, which is centrifuged, washed, air dried at a temperature below 300 ° C., and then pulverized to obtain a sodium fluosilicate finished product.
Last Update：2022-01-01 11:01:22
16893-85-9 - Use
Open Data Verified Data
It is used as an opalescent agent for glass and enamel, a flux, a wood preservative, an agricultural pesticide, and a moisture absorbent for acid-resistant cement. It is a raw material for the production of other fluorides. Natural latex products used as coagulant, zinc plating, nickel, iron coating used as additives, also used as plastic filler. In addition, it is also used in the fluorination treatment of pharmaceutical and drinking water, and the manufacture of artificial cryolite and sodium fluoride.
Last Update：2022-01-01 11:01:21
16893-85-9 - Safety
Open Data Verified Data
This product is toxic, has a stimulating effect on the respiratory organs, the wrong oral poisoning, there will be severe symptoms of gastrointestinal damage. Lethal dose is 0. 4~4G, the operator must wear the necessary protective equipment to prevent poisoning. Production equipment should be closed and the workshop should be well ventilated. Packed in hemp, woven or iron barrels lined with polyethylene plastic bags with a net weight of 50kg per bag (barrel). The package should be marked with "drug. Should be stored in a ventilated, cool, dry warehouse. The packing should be firm. Do not store in the open air, should pay attention to moisture. Do not store and transport together with food, feed and acid products. When there is a fire, it can be put out with water, sand and all kinds of fire retardants. Firemen should wear masks and gloves to prevent poisoning. Toxic substances. Risk code: GB 6.1 class 61514. UNNO.2674; IMDG CODE P. 6250, Class 6.1.
Last Update：2022-01-01 11:01:22
16893-85-9 - Reference Information
| LogP | 0.001 |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | white crystals, crystalline powder or colorless hexagonal crystals. Odorless and tasteless. The relative density of 2.68; Moisture absorption. Soluble in ether and other solvents, insoluble in alcohol. The solubility in acid is greater than in water. In the alkali solution decomposition, generation of sodium fluoride and silica. After burning (300 °c), it decomposes into sodium fluoride and silicon tetrafluoride. Toxic! The solubility of sodium fluosilicate in water at 25 degrees is 0.78%. Adding excess sodium sulfate or sodium chloride during production can increase the concentration of sodium ions in the system, thereby improving the solubility product of fluorosilicate ions and sodium ions, sodium fluosilicate can be more completely precipitated sodium fluosilicate is the production of superphosphate or aluminum plant production of fluoride salt by-products, generally white crystalline powder. The solubility in water is small, less than 1% at room temperature, slightly increased with the increase of temperature. The aqueous solution of sodium fluorosilicate is acidic (PH3). This is due to the presence of hydrofluoric acid in the hydrolysate. Reducing the acidity of the solution is beneficial to the hydrolysis of sodium fluorosilicate. When PH<3.5-3.55, the hydrolysis tends to be stable, and when PH is equal to 4, the hydrolysis is significant. When PH is equal to 8-8.5, sodium fluorosilicate can be completely hydrolyzed into silica gel and precipitated. Therefore, when sodium fluorosilicate is added to the water glass, in addition to neutralizing the sodium hydroxide in the water glass solution to precipitate the silica gel and harden it, the sodium fluorosilicate itself is also a source of the silica gel. |
| reference quality standard | 105 ℃ dry weight loss% 0.17 sodium fluosilicate (dry basis) 99.50 free acid (HCL) 0.0075 water insoluble% 0.12 heavy metal (in Pb) content% fineness% (through 250um sieve) 98.00 appearance white powder |
| function and use | sodium fluosilicate can be used in agricultural pesticides, enamel opalescent agent, opalescent glass corrosion agent, wood preservatives and other fluoride raw materials, and used in beryllium and aluminum smelting and medicine, leather, rubber industry. In refractory materials can be used as a water glass binder accelerator. Since the solubility of sodium fluorosilicate in water is small, its reaction with water glass is slow and gradual, which is not only beneficial to the construction but also the compactness and strength of the hardened material are high. It is most commonly used in water glass-bonded inorganic materials. |
| toxicity | This product is toxic, which can irritate the respiratory organs, symptoms of severe gastrointestinal damage may occur. The lethal dose was 0.4~4G. Operators must wear necessary protective equipment to prevent poisoning. Production equipment should be closed and the workshop should be well ventilated. |
| Application | used as glass, enamel opalescent agent, aluminum alloy welding flux, wood preservative, insecticide, acid-resistant cement moisture absorbent, drinking water fluoride, etc. used as glass and enamel opalescent agent, flux, wood preservative, agricultural pesticides, acid-resistant cement moisture absorbent. Natural latex products used as coagulant, zinc plating, nickel, iron coating used as additives, also used as plastic filler. In addition, it is also used in the fluorination treatment of pharmaceutical and drinking water, and the manufacture of artificial cryolite and sodium fluoride. used as insecticide, adhesive, also used in ceramics, glass, enamel, wood anti-corrosion, medicine, water treatment, leather, rubber and sodium fluoride used as analytical reagents, preservatives, bactericide, also used in enamel Industry melting decomposition of silicate. An alloy of beryllium and aluminum, a ceramic ware of enamel, made of opalescent glass, and treated with sodium fluosilicate, plant ash, and water (1:2:300) to reduce the incidence of wheat winter rust. Anti-cavity and wood preservation of wool products. |
| production method | calcium superphosphate by-product method fluorine-containing waste gas from the reaction of phosphate rock powder and sulfuric acid to produce superphosphate or extract phosphoric acid, the silicon tetrafluoride is absorbed with water to produce fluorosilicic acid. When the concentration of fluorosilicic acid solution reaches 8%~ 10%, static clarification, remove impurities, clear fluorosilicic acid solution to add sodium chloride (excess of about 25%) reaction, the formation of sodium fluorosilicate, after centrifugal separation, washing, air drying at a temperature below 300 ° C., and then grinding to obtain a sodium fluorosilicate finished product. H2SiF6 + 2NaCl → Na2SiF6 + 2HCl |
| category | toxic substances |
| toxicity grade | high toxicity |
| Acute toxicity | oral-mouse LD50: 70 mg/kg |
| stimulation data | Skin-rabbit 500 mg mild; eye-rabbit 100 mg/4 S severe |
| flammability hazard characteristics | non-combustible; Toxic fluoride, sodium oxide and silica smoke emitted from fire scene; reaction with acid to generate toxic hydrogen fluoride |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; Separate storage and transportation from food and acids |
| fire extinguishing agent | large amount of water |
| 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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