Methyltriacetoxysilane
CAS 4253-34-3
EC 224-221-9
Formula C7H12O6Si
MW 220.25 g/mol
Silicones & Silicates Plastics & PolymersPersonal Care & CosmeticsCoatings, Adhesives, Sealants & Elastomers Cross-linking & CuringSurface Modification & Wetting
Description
Methyltriacetoxysilane (CAS 4253-34-3) is an acetoxy-functional silane crosslinker, also known by trade designations K 10S, TSL 8180, and APK 1. It carries no assigned E-code. The compound belongs to the silicones and silicates chemical family and is classified under HS code 29319090.
In RTV silicone sealants and elastomers, it releases acetic acid upon moisture exposure, initiating condensation crosslinking that builds cohesive strength in the cured network. In coatings and adhesive formulations, it acts as an adhesion promoter by forming covalent bonds between inorganic substrates and organic polymer matrices. Personal care formulators also incorporate it as a conditioning and wetting agent in hair treatment products.
The material is supplied as a colorless to yellowish transparent liquid and is subject to REACH registration requirements for EU market access. Procurement teams should confirm grade specifications and SDS documentation prior to ordering, as packaging formats vary by supplier volume tier.
In RTV silicone sealants and elastomers, it releases acetic acid upon moisture exposure, initiating condensation crosslinking that builds cohesive strength in the cured network. In coatings and adhesive formulations, it acts as an adhesion promoter by forming covalent bonds between inorganic substrates and organic polymer matrices. Personal care formulators also incorporate it as a conditioning and wetting agent in hair treatment products.
The material is supplied as a colorless to yellowish transparent liquid and is subject to REACH registration requirements for EU market access. Procurement teams should confirm grade specifications and SDS documentation prior to ordering, as packaging formats vary by supplier volume tier.
Physical Properties
| Melting Point | 40.5 °C |
| Boiling Point | 87-88 °C @ Press: 3 Torr |
| Density | 1.175 g/cm³ |
| Flash Point | 185 °F |
| Appearance | Colorless or yellowish transparent liquid |
| Color | White or Colorless to Almost white or Almost colorless |
| Odor | Acrid odor |
| Form | solid |
| Water Solubility | 1000g/L at 20℃ |
| Vapor Pressure | 0.053-26Pa at 20-25℃ |
| Refractive Index | 1.52-1.522 |
| Log P | -2.4 at 20℃ |
Safety & Handling (Learn More)
Danger GHS05 GHS07 GHS08
H
H302H314H315H318H319H335H371
P
P260P261P264P270P271P280P316P317P319P321P330P363P405P501P264+P265P301+P317P302+P352P304+P340P308+P316P332+P317P337+P317P362+P364P403+P233P301+P330+P331P302+P361+P354P305+P351+P338P305+P354+P338
Trade & Regulatory
| HS Code | 29319090 |
| UN Number | 1759 |
| WGK (Germany) | 2 |
Other Names
[diacetyloxy(methyl)silyl] acetateTriacetoxy(methyl)silaneMTASk10sK 10SAPK 1TSL 8180LABOTEST-BB LT01406986
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