Back رباعي إيثيل أورثو السيليكات Arabic تترااتیل اورتوسیلیکات AZB Tetraethylorthosilicat German تترااتیل اورتوسیلیکات Persian Tetraetyyliortosilikaatti Finnish Orthosilicate de tétraéthyle French Ortosilicato tetraetile Italian オルトケイ酸テトラエチル Japanese Tetraethylorthosilicaat Dutch Tetraetoksysilan Polish
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| Names | |
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| IUPAC name
Tetraethyl orthosilicate
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| Other names
tetraethoxysilane; ethyl silicate, tetra-; silicic acid tetraethyl ester; silicon(IV) ethoxide; TEOS; tetraethyl silicate (ortho-)
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.000.986 |
PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| SiC8H20O4 | |
| Molar mass | 208.33 g⋅mol−1 |
| Appearance | Colourless liquid |
| Odor | Sharp, alcohol-like[1] |
| Density | 0.933 g/mL at 20 °C |
| Melting point | −77 °C (−107 °F; 196 K) |
| Boiling point | 168 to 169 °C (334 to 336 °F; 441 to 442 K) |
| Reacts with water, soluble in ethanol, and 2-propanol | |
| Vapor pressure | 1 mmHg[1] |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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Flammable, harmful by inhalation |
| Flash point | 45 °C (113 °F; 318 K) |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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6270 mg/kg (rat, oral)[2] |
LCLo (lowest published)
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| NIOSH (US health exposure limits): | |
PEL (Permissible)
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TWA 100 ppm (850 mg/m3)[1] |
REL (Recommended)
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TWA 10 ppm (85 mg/m3)[1] |
IDLH (Immediate danger)
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700 ppm[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tetraethyl orthosilicate, formally named tetraethoxysilane (TEOS), ethyl silicate is the organic chemical compound with the formula Si(OC2H5)4. TEOS is a colorless liquid. It degrades in water. TEOS is the ‹The template Category link is being considered for merging.› ethyl ester of orthosilicic acid, Si(OH)4. It is the most prevalent alkoxide of silicon.
TEOS is a tetrahedral molecule. Like its many analogues, it is prepared by alcoholysis of silicon tetrachloride:
- SiCl4 + 4 EtOH → Si(OEt)4 + 4 HCl
where Et is the ethyl group, C2H5, and thus EtOH is ethanol.
- ^ a b c d e NIOSH Pocket Guide to Chemical Hazards. "#0282". National Institute for Occupational Safety and Health (NIOSH).
- ^ a b "Ethyl silicate". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).