Tetramethyl orthosilicate
- CAS No.
- 681-84-5
- Chemical Name:
- Tetramethyl orthosilicate
- Synonyms
- TMOS;TETRAMETHOXYSILANE;Dynasil M;METHYLSILICATE;Tetramethylsilicate;tl190;DK866;TL 190;CFS-845;(CH3)4SiO4
- CBNumber:
- CB6177258
- Molecular Formula:
- C4H12O4Si
- Molecular Weight:
- 152.22
- MOL File:
- 681-84-5.mol
- Modify Date:
- 2024/7/25 20:04:51
| Melting point | −4 °C(lit.) |
|---|---|
| Boiling point | 121-122 °C(lit.) |
| Density | 1.023 g/mL at 25 °C(lit.) |
| vapor density | 5.25 (vs air) |
| vapor pressure | 3.35 psi ( 20 °C) |
| refractive index |
n |
| FEMA | 3185 | METHYLATED SILICA |
| Flash point | 84 °F |
| storage temp. | Store below +30°C. |
| form | liquid |
| Specific Gravity | 1.032 |
| color | colorless |
| explosive limit | 0.88-23.8%(V) |
| Water Solubility | hydrolysis |
| Sensitive | Moisture Sensitive |
| Hydrolytic Sensitivity | 7: reacts slowly with moisture/water |
| BRN | 1699658 |
| InChIKey | LFQCEHFDDXELDD-UHFFFAOYSA-N |
| CAS DataBase Reference | 681-84-5(CAS DataBase Reference) |
| NIST Chemistry Reference | Tetramethyl silicate(681-84-5) |
| EPA Substance Registry System | Tetramethyl silicate (681-84-5) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |    GHS02,GHS05,GHS06 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H226-H315-H318-H330 | |||||||||
| Precautionary statements | P210-P233-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338 | |||||||||
| Hazard Codes | T+ | |||||||||
| Risk Statements | 10-26-37/38-41 | |||||||||
| Safety Statements | 16-26-36/37/39-45-28A | |||||||||
| RIDADR | UN 2606 6.1/PG 1 | |||||||||
| OEB | B | |||||||||
| OEL | TWA: 1 ppm (6 mg/m3) | |||||||||
| WGK Germany | 3 | |||||||||
| RTECS | VV9800000 | |||||||||
| F | 10-21 | |||||||||
| Autoignition Temperature | 245 °C | |||||||||
| TSCA | Yes | |||||||||
| HazardClass | 6.1 | |||||||||
| PackingGroup | I | |||||||||
| HS Code | 29209085 | |||||||||
| NFPA 704 |
|
Tetramethyl orthosilicate price More Price(8)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich(India) | 8.14651 | Tetramethyl orthosilicate for synthesis | 681-84-5 | 25ML | ₹3989.99 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 8.14651 | Tetramethyl orthosilicate for synthesis | 681-84-5 | 100ML | ₹11180 | 2022-06-14 | Buy |
| ALFA India | ALF-L09716-36 | Tetramethoxysilane, 98% | 681-84-5 | 500g | ₹14031 | 2022-05-26 | Buy |
| ALFA India | ALF-L09716-22 | Tetramethoxysilane, 98% | 681-84-5 | 100g | ₹4264 | 2022-05-26 | Buy |
| ALFA India | ALF-L09716-14 | Tetramethoxysilane, 98% | 681-84-5 | 25g | ₹1676 | 2022-05-26 | Buy |
Tetramethyl orthosilicate Chemical Properties,Uses,Production
Chemical Properties
Tetramethyl orthosilicate (TMOS), the methyl ester of orthosilicic acid, is a colorless, low-viscosity liquid. It is industrially the most important of the tetraalkyl silicates.
Uses
Tetramethyl Orthosilicate is a compound used in the research of the multifunctionality of silicified nanoshells and the efficiency at adsorbing cadmium ions at cell interfaces.
Production Methods
Silica aerogels are usually prepared by base-catalyzed reaction of tetramethoxysilane or tetraethoxysilane, mostly with ammonia as the catalyst. A modification of this procedure is to prehydrolyze Si(OR)4 with a small amount of water under acidic conditions.
General Description
A clear colorless liquid. Flash point below 125°F. Less dense than water and insoluble in water. Very toxic by ingestion and inhalation and very irritating to skin and eyes. Used to make paints and lacquers.
Air & Water Reactions
Flammable. Insoluble in water.
Reactivity Profile
Tetramethyl orthosilicate is incompatible with the following: Oxidizers; hexafluorides of rhenium, molybdenum & tungsten .
Hazard
Eye damage and upper respiratory tract irri-tant.
Health Hazard
TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Bromoacetates and chloroacetates are extremely irritating/lachrymators. Reaction with water or moist air will release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will 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
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.
Safety Profile
Poison by intraperitoneal route. Moderately toxic by inhalation. Midly toxic by skin contact. A severe eye irritant. This material can cause extensive necrosis (experimentally), keratoconus, and opaque cornea. It also causes severe human eye injuries, as well as necrosis of corneal cells, which progresses long after exposure has ceased. It is destructive and its effects resist treatment. Permanent blindness is possible from exposure to it. The kidney seems to be most subject to injury regardless of the mode of exposure. Pulmonary edema has also occurred. This material is more toxic than either ethyl silicate or silicic acid, although it has been thought that the injury caused is largely due to the action of the silicic acid. Flammable when exposed to heat or flame; can react vigorously with oxidizing materials. Potentially violent reaction with metal hexafluorides (e.g., rhenium, molybdenum, tungsten). When heated to decomposition it emits acrid smoke and irritating fumes.
Potential Exposure
Methyl silicate is used in coating screens of television picture tubes. It may be used in mold binders and in corrosion-resistant coatings; as well as in catalyst preparation and as a silicone intermediate.
Shipping
UN2606 Methyl orthosilicate, Hazard class: 6.1; Labels: 6.1-Poisonous materials, 3-Flammable liquid.
Purification Methods
Purification is as for tetraethoxysilane. It has a vapour pressure of 2.5mm at 0o. [IR: Sternbach & MacDiarmid J Am Chem Soc 81 5109 1959. Beilstein 1 IV 1266.]
Incompatibilities
Vapor may form explosive mixture with air. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, including alkaline earth metals, metals, strong acids, strong bases; water, moisture, steam decomposes releasing toxic, flammable gases. Violent reaction with metal hexafluorides of rhenium, molybdenum, and tungsten. Contact with metals may evolve flammable hydrogen gas.
Tetramethyl orthosilicate Preparation Products And Raw materials
Raw materials
Preparation Products
1of3
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