Methyltriethoxysilane
CAS 2031-67-6
EC 217-983-9
Formula C7H18O3Si
MW 178.3 g/mol
Silicones & Silicates Personal Care & CosmeticsCoatings, Adhesives, Sealants & ElastomersElectronicsAutomotivePlastics & Polymers Surface Modification & WettingCross-linking & CuringEmulsification & Dispersion
Description
Methyltriethoxysilane (CAS 2031-67-6) is an organosilane monomer sold under trade names including A-162, CM9050, TSL 8123, and ICI-EP5850. It carries no assigned E-code. The compound belongs to the silicones and silicates chemical family and is classified under HS code 29310095.
In coatings and sealant formulations, methyltriethoxysilane functions as a crosslinker by hydrolyzing its ethoxy groups to form silanol species that condense into Si-O-Si networks, improving moisture resistance and substrate adhesion. In personal care, it acts as a film-forming emollient and hair conditioner by bonding to keratin surfaces through the same hydrolysis mechanism.
This material is supplied as a REACH-registered substance and is available in standard industrial drum and IBC packaging. Procurement teams should confirm grade specifications directly with the supplier, as purity profiles vary between electronic, coatings, and personal care applications.
In coatings and sealant formulations, methyltriethoxysilane functions as a crosslinker by hydrolyzing its ethoxy groups to form silanol species that condense into Si-O-Si networks, improving moisture resistance and substrate adhesion. In personal care, it acts as a film-forming emollient and hair conditioner by bonding to keratin surfaces through the same hydrolysis mechanism.
This material is supplied as a REACH-registered substance and is available in standard industrial drum and IBC packaging. Procurement teams should confirm grade specifications directly with the supplier, as purity profiles vary between electronic, coatings, and personal care applications.
Physical Properties
| Melting Point | <-40°C |
| Boiling Point | 142 °C |
| Density | 0.894 g/cm³ |
| Flash Point | 75 °F |
| Appearance | Colorless clear liquid |
| Color | colorless |
| Odor | Mild odor |
| Form | liquid |
| Water Solubility | INSOLUBLE |
| Vapor Pressure | 11 mm Hg ( 20 °C) |
| Refractive Index | n 20/D 1.383(lit.) |
| Log P | -2.4-2.2 |
Safety & Handling (Learn More)
Warning GHS02
H
H226
P
P210P233P240P241P242P243P280P501P370+P378P403+P235P303+P361+P353
Trade & Regulatory
| HS Code | 29310095 |
| UN Number | 1993 |
| ADR Class | 3 |
| Packing Group | III |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 3 |
Other Names
triethoxy(methyl)silaneTriethoxymethylsilaneMTESa162A 162TSL 8123ici-ep5850
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