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Vinyltrimethoxysilane

CAS Number
2768-02-7
EC Number
220-449-8
Chemical Formula
C5H12O3Si
Molecular Weight
148.23 g/mol
Industries:AutomotivePersonal Care & CosmeticsPlastics & PolymersCoatings, Adhesives, Sealants & Elastomers

Description

Vinyltrimethoxysilane (CAS 2768-02-7 ), commonly abbreviated as VTMS, is a bifunctional organosilane monomer used to chemically bridge inorganic substrates and organic polymer matrices. It provides covalent bonding between mineral fillers, glass fibers, or metal surfaces and surrounding resin systems, improving composite performance and adhesion durability across various industries. In polyolefin cable and pipe manufacturing, VTMS enables moisture-cure crosslinking of polyethylene, producing XLPE compounds with improved thermal and mechanical resistance for demanding environments. It functions as a coupling agent in glass fiber-reinforced composites, bonding the silica surface to epoxy, polyester, or polyurethane resins to increase tensile strength and reduce delamination. Coatings and adhesive formulators use VTMS as an adhesion promoter on glass, aluminum, and mineral substrates, particularly in automotive glazing sealants and structural bonding applications. In electronics, it supports surface treatment of silica fillers used in encapsulants and underfill compounds, improving filler dispersion and moisture resistance in cured systems. Vinyltrimethoxysilane is supplied as a clear liquid in drum and IBC quantities, with bulk tanker options available for high-volume buyers requiring consistent supply chains. Standard commercial grades include technical and industrial purity levels, typically specified at ≥97% or ≥98% purity. Specialty grades are available for high-performance polymer applications. Contact us for supply of Vinyltrimethoxysilane Request Quote

Other Names (Synonyms)

Silane, ethenyltrimethoxy- | (Trimethoxysilyl)ethene | Silane, trimethoxyvinyl- | 0ZIU135UES | A 171 (Silane derivative) | VTMS

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point<-70°C
Boiling Point123 °C
Density0.970 g/cm³
Flash Point73 °F
AppearanceColorless transparent liquid
ColorColorless to Almost colorless
OdorFruity odor
Formliquid
Water Solubilityslightly soluble
Vapor Pressure88 hPa (55 °C)
Refractive Indexn 20/D 1.392(lit.)
Log P-2--0.82 at 20℃

Safety & Handling

Warning
GHS07· IrritantGHS02· FlammableGHS05· CorrosiveGHS08· Health Hazard

Hazard Statements

H225Highly Flammable liquid and vapor
H226Flammable liquid and vapor
H315Causes skin irritation
H317May cause an allergic skin reaction
H318Causes serious eye damage
H319Causes serious eye irritation
H332Harmful if inhaled
H336May cause drowsiness or dizziness
H371May cause damage to organs
H373May causes damage to organs through prolonged or repeated exposure

Precautionary Statements

P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233Keep container tightly closed.
P240Ground and bond container and receiving equipment.
P241Use explosion-proof equipment.
P242Use non-sparking tools.
P243Take action to prevent static discharges.
P260Do not breathe dust/fume/gas/mist/vapours/spray.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P271Use only outdoors or in a well-ventilated area.
P272Contaminated work clothing should not be allowed out of the workplace.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P317Get emergency medical help.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P316Get emergency medical help immediately.
P317Get emergency medical help.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off contaminated clothing and wash it before reuse.
P378Use … for extinction.
P233Store in a well-ventilated place. Keep container tightly closed.
P235Store in a well-ventilated place. Keep cool.
P353IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29310095
UN Number1993
ADR Class3
Packing GroupII
WGK (Germany)1