Methyltrimethoxysilane
CAS 1185-55-3
EC 214-685-0
Formula C4H12O3Si
MW 136.22 g/mol
Silicones & Silicates Coatings, Adhesives, Sealants & ElastomersPersonal Care & CosmeticsAutomotivePlastics & PolymersElectronics Surface Modification & WettingCross-linking & CuringHumectant & MoisturizingEmulsification & Dispersion
Description
Methyltrimethoxysilane (CAS 1185-55-3) is an organosilane monomer sold under trade names including A 163, MTS 31, Z 6070, CM9100, and KBM 13. It carries no E-code designation and is classified under HS code 29310095 within the silicones and silicates category.
In coatings and sealant formulations, methyltrimethoxysilane acts as a crosslinker by reacting with hydroxyl groups on substrate surfaces, forming durable Si-O-Si networks that improve moisture resistance and adhesion. In personal care, it functions as a surface-modifying agent on hair and skin, reducing friction and improving spreadability through hydrophobic film formation.
The material is supplied as a technical-grade liquid and falls under REACH registration requirements for EU market supply. Procurement teams should confirm SDS compliance and purity specifications with the supplier prior to ordering, as grade requirements vary between electronics, coatings, and personal care end uses.
In coatings and sealant formulations, methyltrimethoxysilane acts as a crosslinker by reacting with hydroxyl groups on substrate surfaces, forming durable Si-O-Si networks that improve moisture resistance and adhesion. In personal care, it functions as a surface-modifying agent on hair and skin, reducing friction and improving spreadability through hydrophobic film formation.
The material is supplied as a technical-grade liquid and falls under REACH registration requirements for EU market supply. Procurement teams should confirm SDS compliance and purity specifications with the supplier prior to ordering, as grade requirements vary between electronics, coatings, and personal care end uses.
Physical Properties
| Melting Point | -78 °C |
| Boiling Point | 102-103 °C |
| Density | 0.955 g/cm³ |
| Flash Point | 52 °F |
| Appearance | Colorless clear liquid |
| Color | colorless |
| Odor | Mild odor |
| Form | liquid |
| Water Solubility | decomposes |
| Vapor Pressure | 2990 hPa (20 °C) |
| Refractive Index | n 20/D 1.371(lit.) |
| Log P | -2.4-0.7 at 20℃ |
Safety & Handling (Learn More)
Danger GHS02 GHS07 GHS05 GHS08
H
H225H315H317H318H319H320H332H335H336H373
P
P210P233P240P241P242P243P260P261P264P271P272P280P317P319P321P405P501P264+P265P302+P352P304+P340P332+P317P333+P317P337+P317P362+P364P370+P378P403+P233P403+P235P303+P361+P353P305+P351+P338P305+P354+P338
Trade & Regulatory
| HS Code | 29310095 |
| UN Number | 1993 |
| ADR Class | 3 |
| Packing Group | II |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 3 |
Other Names
Trimethoxy(methyl)silaneMTMSA 163Z 6070KBM 13MTS 31SZ 6070
Related Products
Raw Materials
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