Silicones & Silicates
REACH
Octyltriethoxysilane
CAS Number
2943-75-1
EC Number
220-941-2
What is Octyltriethoxysilane?
Octyltriethoxysilane (CAS 2943-75-1) is an organosilane coupling agent and surface modifier.
Where is Octyltriethoxysilane used?
- Coatings and sealants: hydrophobic surface treatment for mineral fillers such as silica and calcium carbonate, reducing moisture uptake and improving dispersion
- Silicone elastomers and rubber: crosslinking and compatibilization agent, enhancing mechanical performance and filler-polymer bonding
- Plastics: improves interfacial adhesion between glass fiber reinforcements and polymer matrices, affecting tensile strength and processing consistency
- Personal care: treats pigments and powders, producing surface-modified particles with improved skin feel and oil dispersibility
- It bonds inorganic substrates to organic matrices, improving adhesion and water repellency.
Good to know: Concentration and purity specifications vary by supplier; buyers should confirm silane content with the technical datasheet and verify hydrolysis stability and compliance with relevant industrial standards.
Commercial specifications
- Drums, IBCs, and bulk quantities
- High-purity grades for specialty coating and personal care end uses
Other Names (Synonyms)
n-Octyltriethoxysilane|Triethoxy(octyl)silane|Silane, triethoxyoctyl-|Dynasylan OCTEO|Prosil 9202|Silquest A 137|Y 9187
What are the physical properties of Octyltriethoxysilane?
Melting Point <-40 °C
Boiling Point 98-99 °C @ Press: 2 Torr
Density 0.875 g/cm³
Flash Point 210 °F
Appearance Colorless transparent liquid
Color Colorless to Almost colorless
Odor Mild odor
Form liquid
Water Solubility reacts
Vapor Pressure 0.1 hPa (20 °C)
Refractive Index n 20/D 1.417(lit.)
Log P -0.3-6.41 at 20℃
How is Octyltriethoxysilane classified and handled safely? Learn More
Warning
GHS02· Flammable GHS07· Irritant GHS09· Environmental Hazard
Hazard Statements
H226 Flammable liquid and vapor
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
H411 Toxic to aquatic life with long lasting effects
Precautionary Statements
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P240 Ground and bond container and receiving equipment.
P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment.
Which trade and regulatory codes apply to Octyltriethoxysilane?
HS Code 29310095
Storage Class 10 - Combustible liquids
WGK (Germany) 1