Methyltrimethoxysilane
Also known as: Trimethoxy(methyl)silane, MTMS, DOW CORNING® Z-6070, Dynasylan MTMS, Silane, trimethoxymethyl-, Silane, methyltrimethoxy-, Union carbide a-163, Z 6070, CM9100, HD-119
Methyltrimethoxysilane (CAS 1185-55-3) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C4H12O3Si and a molecular weight of 136.222 g/mol. Key properties include a melting point of <-70ºC, a boiling point of 102.5±0.0 °C at 760 mmHg, a density of 0.9±0.1 g/cm3 and a flash point of 11.1±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour and H317 — May cause an allergic skin reaction. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.
- CAS No.
- 1185-55-3
- Jingsj CID
- J-18771-3
- Molecular Formula
- C4H12O3Si
- Molecular Weight
- 136.222 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 11/3/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | <-70ºC |
|---|---|
| Boiling Point | 102.5±0.0 °C at 760 mmHg |
| Density | 0.9±0.1 g/cm3 |
| Flash Point | 11.1±0.0 °C |
| Exact Mass | 136.055573 |
| PSA | 27.69000 |
| LogP | 0.14 |
| Vapor Pressure | 38.8±0.1 mmHg at 25°C |
| Refractive Index | 1.379 |
| Additional Property | decomposes |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H317 — May cause an allergic skin reaction
Customs & Trade Information
| HS Code | 2931900090 |
|---|---|
| Summary | 2931900090. other organo-inorganic compounds. VAT:17.0%. Tax rebate rate:13.0%. Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward). MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Methyltrimethoxysilane?
The CAS number of Methyltrimethoxysilane is 1185-55-3.
What are the molecular formula and molecular weight of Methyltrimethoxysilane?
Methyltrimethoxysilane has molecular formula C4H12O3Si and molecular weight 136.222 g/mol.
Is Methyltrimethoxysilane hazardous?
Methyltrimethoxysilane has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H317 — May cause an allergic skin reaction.
What are the upstream and downstream products of Methyltrimethoxysilane?
For Methyltrimethoxysilane, Upstream Products: Methyltrichlorosilane, Methanol, Silicon; Downstream Products: Methoxytrimethylsilane, Trifluoro(methyl)silane, Dimethyldimethoxysilane.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Methyltrimethoxysilane (CAS 1185-55-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-18771-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.