Methyltriacetoxysilane
Synonym(s):Methyltriacetoxysilane
- CAS NO.：4253-34-3
- Empirical Formula: C7H12O6Si
- Molecular Weight: 220.25
- MDL number: MFCD00008694
- EINECS: 224-221-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:12:41
What is Methyltriacetoxysilane?
Chemical properties
Methyltriacetoxysilane (MTAC) is a clear to yellowish liquid with acrid odor of acetic acid (vinegar). It hydrolyzes in the presence of moisture (acetic acid is released) to form silanols, which can react with themselves to pro-duce siloxanes or bind to inorganic substrates.
Flammability and Explosibility
Not classified
Properties of Methyltriacetoxysilane
| Melting point: | 40-45 °C(lit.) |
| Boiling point: | 94-95 °C9 mm Hg(lit.) |
| Density | 1.20 g/mL at 20 °C(lit.) |
| vapor pressure | 0.053-26Pa at 20-25℃ |
| refractive index | 1.52-1.522 |
| Flash point: | 185 °F |
| solubility | soluble in Methanol |
| form | solid |
| color | White or Colorless to Almost white or Almost colorless |
| Specific Gravity | 1.175 |
| Water Solubility | 1000g/L at 20℃ |
| Hydrolytic Sensitivity | 7: reacts slowly with moisture/water |
| Sensitive | Moisture Sensitive |
| BRN | 1788668 |
| CAS DataBase Reference | 4253-34-3(CAS DataBase Reference) |
| NIST Chemistry Reference | Methyltriacetoxysilane(4253-34-3) |
| EPA Substance Registry System | Silanetriol, 1-methyl-, 1,1,1-triacetate (4253-34-3) |
Safety information for Methyltriacetoxysilane
| Signal word | Danger |
| Pictogram(s) |
 Corrosion Corrosives GHS05  Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H314:Skin corrosion/irritation |
| Precautionary Statement Codes |
P260:Do not breathe dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P330+P331:IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. 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 for Methyltriacetoxysilane
| InChIKey | TVJPBVNWVPUZBM-UHFFFAOYSA-N |
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