Dimethylethoxysilane
- CAS NO.：14857-34-2
- Empirical Formula: C4H12OSi
- Molecular Weight: 104.22
- MDL number: MFCD00026750
- EINECS: 238-921-7
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-09-12 18:55:25
What is Dimethylethoxysilane?
Chemical properties
Colorless clear liquid
The Uses of Dimethylethoxysilane
Dimethylethoxysilane (DMES), a volatile liquid, is used by NASA to waterproof the heatprotective silica tiles and blankets on the space shuttle. DMES readily produces a variety of products in the presence of small amounts of moisture or bases. DMES readily produces a variety of products in the presence of small amounts of moisture or bases.
What are the applications of Application
Dimethylethoxysilane is a silane derivative that has been used in space shuttle thermal tile research
What are the applications of Application
Will form high-boiling polymeric by-products with aqueous work-up
Hazard
An inhalation hazard. Headache, eye and upper respiratory tract irritant.
Safety Profile
An inhalation hazard. Experimental reproductive effects. A flammable liquid. When heated to decomposition it emits acrid smoke and irritating vapors.
Properties of Dimethylethoxysilane
| Boiling point: | 55 °C |
| Density | 0.757 |
| refractive index | 1.3680 |
| Flash point: | 15°C |
| storage temp. | Flammables area |
| Specific Gravity | 0.757 |
| Water Solubility | Hydrolyzes in water. |
| Sensitive | Moisture Sensitive |
| Hydrolytic Sensitivity | 7: reacts slowly with moisture/water |
| BRN | 1731481 |
| Exposure limits | ACGIH: TWA 0.5 ppm; STEL 1.5 ppm |
| CAS DataBase Reference | 14857-34-2(CAS DataBase Reference) |
| EPA Substance Registry System | Silane, ethoxydimethyl- (14857-34-2) |
Safety information for Dimethylethoxysilane
| Pictogram(s) |
 Flame Flammables GHS02  Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H225:Flammable liquids H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P261:Avoid breathing dust/fume/gas/mist/vapours/spray. 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. P405:Store locked up. |
Computed Descriptors for Dimethylethoxysilane
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