Silicones & Silicates
REACH
3-chloropropyltriethoxysilane
CAS Number
2530-87-2
EC Number
219-787-9
What is 3-chloropropyltriethoxysilane?
3-Chloropropyltriethoxysilane (CAS 2530-87-2) is an organosilane coupling agent that chemically bridges inorganic substrates and organic polymer matrices. Also marketed as (3-chloropropyl)trimethoxysilane.
Where is 3-chloropropyltriethoxysilane used?
- Coatings, adhesives and sealants: improves adhesion to glass, metal and mineral fillers through covalent bonds at the interface
- Electronics: surface treatment of substrates and encapsulant formulations where moisture resistance and dielectric stability matter
- Plastics and polymer compounding: coupling agent for silica and glass fiber reinforcements
- Textile and leather finishing: modifies fiber surfaces for compatibility with functional coatings
- The reactive chloropropyl group acts as a precursor for further functionalization.
Good to know: The methoxy form offers faster hydrolysis rates relevant to certain cure-speed requirements; both ethoxy and methoxy variants are commercially available.
Commercial specifications
- Purity specifications typically 97% or higher
- Clear liquid in drums to IBC containers
Other Names (Synonyms)
3-(trimethoxysilyl)propyl chloride|(3-Chloropropyl)trimethoxysilane
What are the physical properties of 3-chloropropyltriethoxysilane?
Melting Point -50°C
Boiling Point 100 °C @ Press: 40 Torr
Density 1.077 g/cm³ @ Temp: 25 °C
Flash Point 136 °F
Appearance Colorless transparent liquid
Color Clear colorless to slightly yellow
Form Liquid
Water Solubility Hydrolyzes in water.
Vapor Pressure <5 hPa (20 °C)
Refractive Index n 20/D 1.419(lit.)
Log P -1.1-2 at 20℃
How is 3-chloropropyltriethoxysilane classified and handled safely? Learn More
Warning
GHS02· Flammable GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H226 Flammable liquid and vapor
H315 Causes skin irritation
H320 Causes eye irritation
H336 May cause drowsiness or dizziness
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 3-chloropropyltriethoxysilane?
HS Code 29310095
UN Number 1993
ADR Class 3
Packing Group III
Storage Class 10 - Combustible liquids
WGK (Germany) 1