A7728212
Tetraethyl orthosilicate , >99%(GC) , 78-10-4
Synonym(s):
TEOS;Tetraethyl orthosilicate;Tetraethoxysilane;Tetraethyl silicate;Tetraethoxysilicon(IV)
CAS NO.：78-10-4
Empirical Formula: C8H20O4Si
Molecular Weight: 208.33
MDL number: MFCD00009062
EINECS: 201-083-8
Update time: 2022-07-08
PRODUCT Properties
| Melting point: | -77 °C |
| Boiling point: | 168 °C(lit.) |
| Density | 0.933 g/mL at 20 °C(lit.) |
| vapor density | 7.2 (vs air) |
| vapor pressure | <1 mm Hg ( 20 °C) |
| refractive index | n |
| Flash point: | 116 °F |
| storage temp. | Store below +30°C. |
| solubility | Soluble in ethanol and 2-propanol. |
| form | Liquid |
| Specific Gravity | 0.934 |
| color | Colorless |
| explosive limit | 1.3-23%(V) |
| Water Solubility | Hydrolysis |
| FreezingPoint | -77℃ |
| Sensitive | Moisture Sensitive |
| Hydrolytic Sensitivity | 7: reacts slowly with moisture/water |
| Merck | 14,3851 |
| BRN | 1422225 |
| Dielectric constant | 4.1（20℃） |
| Exposure limits | ACGIH: TWA 10 ppm OSHA: TWA 100 ppm(850 mg/m3) NIOSH: IDLH 700 ppm; TWA 10 ppm(85 mg/m3) |
| Stability: | Stable. Flammable. Incompatible with strong oxidizing agents, water, alkalies, mineral acids. |
| InChIKey | BOTDANWDWHJENH-UHFFFAOYSA-N |
| CAS DataBase Reference | 78-10-4(CAS DataBase Reference) |
| NIST Chemistry Reference | Silicic acid (H4sio4), tetraethyl ester(78-10-4) |
| EPA Substance Registry System | Tetraethyl silicate (78-10-4) |
Description and Uses
Tetraethyl Orthosilicate is used in the preparation of antidreflective coatings on silicate glass via silicon dioxide. Crosslinking reagent.
Safety
| Symbol(GHS) |   GHS02,GHS07 |
| Signal word | Warning |
| Hazard statements | H226-H319-H332-H335 |
| Precautionary statements | P210-P233-P240-P241-P304+P340+P312-P305+P351+P338 |
| Hazard Codes | Xn |
| Risk Statements | 10-20-36/37-36/37/38 |
| Safety Statements | 16-36/37/39-26-24/25 |
| RIDADR | UN 1292 3/PG 3 |
| OEB | A |
| OEL | TWA: 10 ppm (85 mg/m3) |
| WGK Germany | 1 |
| RTECS | VV9450000 |
| Autoignition Temperature | 230 °C |
| TSCA | Yes |
| HS Code | 2920 90 70 |
| HazardClass | 3 |
| PackingGroup | III |
| Hazardous Substances Data | 78-10-4(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 6270 mg/kg LD50 dermal Rabbit 5860 mg/kg |
| IDLA | 700 ppm |
