Silicones & Silicates
REACH
Phenyltrimethoxysilane
CAS Number
2996-92-1
EC Number
221-066-9
What is Phenyltrimethoxysilane?
Phenyltrimethoxysilane (CAS 2996-92-1) is an organosilane monomer used to introduce phenyl functionality into silicone networks and inorganic surfaces.
Where is Phenyltrimethoxysilane used?
- Coatings and electronics: surface modifier, crosslinker and polymerization building block
- Silicone resin synthesis: contributes phenyl groups that improve thermal stability and compatibility with organic polymers
- Electronics: treats fillers and substrates, improving adhesion and moisture resistance in encapsulation compounds
- Underfill formulations: supports long-term component reliability
- Adhesives and sealants: crosslinking agent that enhances bond durability to glass, metal and ceramic surfaces
- Plastics compounding: coupling agent that improves filler-matrix adhesion in reinforced polymer systems
- It is handled according to standard chemical safety protocols for organosilicon compounds.
Commercial specifications
- Purity typically 97% to 99%+, with higher-purity grades for electronics and specialty polymer applications
Other Names (Synonyms)
Silane, trimethoxyphenyl-|21TQE746S9|RefChem:861841|Benzene, (trimethoxysilyl)-|(Trimethoxysilyl)benzene
What are the physical properties of Phenyltrimethoxysilane?
Melting Point -25 °C
Boiling Point 211 °C
Density 1.064 g/cm³
Flash Point 99 °F
Appearance Colorless transparent liquid
Color colorless
Odor Mild odor
Form liquid
Water Solubility Reacts with water.
Vapor Pressure 0-12790Pa at 20-25℃
Refractive Index n 20/D 1.468(lit.)
Log P -0.74-2 at 22℃
How is Phenyltrimethoxysilane classified and handled safely? Learn More
Warning
GHS02· Flammable GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H226 Flammable liquid and vapor
H302 Harmful if swallowed
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
H373 May causes damage to organs through prolonged or repeated exposure
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 Phenyltrimethoxysilane?
HS Code 29319090
UN Number 1992
ADR Class 3
Packing Group III
Storage Class 3 - Flammable liquids
WGK (Germany) 3