681-84-5
Product Name:
Tetramethyl orthosilicate
Formula:
C4H12O4Si
Synonyms:
Tetramethoxysilane;Tetramethyl orthosilicate
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Methyl orthosilicate appears as 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. |
|---|---|
| Color/Form | Colorless liquid |
| Boiling Point | 250 °F at 760 mmHg (NIOSH, 2023) |
| Melting Point | 28 °F (NIOSH, 2023) |
| Flash Point | 205 °F (NIOSH, 2023) |
| Solubility | Soluble (NIOSH, 2023) |
| Density | 1.02 (NIOSH, 2023) - Denser than water; will sink |
| Vapor Density | Relative vapor density (air = 1): 5.3 |
| Vapor Pressure | 12 mmHg at 77 °F (NIOSH, 2023) |
| Stability/Shelf Life | VOLATILE |
| Decomposition | When heated to decomposition, it emits acrid smoke and irritating fumes. |
| Viscosity | 0.5 cP |
| Heat of Vaporization | 46.5 kJ/mol |
| Refractive Index | Index of refraction: 1.3683 at 20 °C |
| Kovats Retention Index | 668 668.2 |
| Other Experimental Properties | Hydrolyzes in water after 2 days |
| Chemical Classes | Metals -> Metalloid Compounds (Silicon) |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Corrosion Corrosives GHS05  Skull and Crossbones Acute Toxicity GHS06 |
| GHS Hazard Statements |
H226:Flammable liquids H315:Skin corrosion/irritation H318:Serious eye damage/eye irritation H330:Acute toxicity,inhalation |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
COMPUTED DESCRIPTORS
| Molecular Weight | 152.22 g/mol |
|---|---|
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 4 |
| Rotatable Bond Count | 4 |
| Exact Mass | 152.05048539 g/mol |
| Monoisotopic Mass | 152.05048539 g/mol |
| Topological Polar Surface Area | 36.9 Ų |
| Heavy Atom Count | 9 |
| Formal Charge | 0 |
| Complexity | 55.5 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Methyl orthosilicate appears as 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.