VINYLTRIMETHOXYSILANE

Vinyltrimethoxysilane is an organosilane coupling agent used to improve adhesion and compatibility between inorganic surfaces and organic polymers, and Vinyltrimethoxysilane is valued for enhancing bonding, moisture resistance, and mechanical performance in filled or reinforced systems.
Vinyltrimethoxysilane is widely used in wire and cable insulation, polyethylene crosslinking systems, fiberglass-reinforced composites, coatings, and adhesives, and Vinyltrimethoxysilane performance depends on purity, hydrolysis and condensation control, dosage, and the chemistry of the substrate and polymer matrix.
Vinyltrimethoxysilane is typically supplied as a clear, colorless liquid with characteristic odor, and Vinyltrimethoxysilane hydrolyzes in the presence of moisture and can release methanol, so handling requires moisture control, ventilation, and strict safety practices.

CAS Number: 2768-02-7
EC Number: 220-449-8
Molecular Formula: C5H12O3Si
Molecular Weight: 148.22 g/mol

Synonyms: Vinyltrimethoxysilane, Vinyl Trimethoxy Silane, Trimethoxyvinylsilane, VTMS, Silane Coupling Agent VTMS, Tri-methoxy Vinyl Silane, Vinyltrimethoxysilane Monomer, Trimethoxy(vinyl)silane, Vinylsilane Trimethoxy, Organosilane Coupling Agent, Vinyltrimethoxysilane Adhesion Promoter, Vinyltrimethoxysilane Grafting Agent, Vinyltrimethoxysilane, Trimethoxyvinylsilane, Vinyl Trimethoxy Silane, Trimethoxy Vinyl Silane, VTMS, VTMOS, Ethenyltrimethoxysilane, Ethenyl Trimethoxy Silane, Trimethoxyethenylsilane, Trimethoxy Ethenyl Silane, Silane Ethenyltrimethoxy, Silane Vinyltrimethoxy, Vinyltri(methoxy)silane, Tri(methoxy)vinylsilane, Trimethoxy(vinyl)silane, Methoxyvinylsilane, Vinylmethoxysilane, Organofunctional Vinyl Silane, Vinyl Functional Silane, Methoxy Functional Vinyl Silane, Vinyl Silane Coupling Agent, Vinyltrimethoxysilane Coupling Agent, VTMS Coupling Agent, Vinyl Silane Adhesion Promoter, Vinyltrimethoxysilane Adhesion Promoter, Vinyl Silane Crosslinker, Vinyltrimethoxysilane Crosslinker, Vinyl Silane Monomer, Vinyltrimethoxysilane Monomer, Vinyl Silane Modifier, Vinyltrimethoxysilane Modifier, Silane Coupling Agent A-171, A-171 Silane, Silquest A-171, Dynasylan VTMO, Dynasylan VTMOEO, DOWSIL Z-6300

APPLICATIONS

Vinyltrimethoxysilane is used as a coupling agent in polyethylene and EVA systems to enable moisture-curing crosslinking in silane-crosslinked cable compounds.
Vinyltrimethoxysilane is incorporated into wire and cable insulation to improve mechanical properties and moisture resistance after crosslinking.
Vinyltrimethoxysilane is used in silane-grafting processes where vinyl silane functionality is introduced into polymer chains.

Vinyltrimethoxysilane is used in fiberglass and mineral-filled composites to improve filler wetting and interfacial adhesion.
Vinyltrimethoxysilane is incorporated into glass fiber reinforced plastics to improve strength retention and reduce water-related property loss.
Vinyltrimethoxysilane is used in mineral-filled polypropylene and polyethylene in selected applications to improve dispersion and mechanical performance.

Vinyltrimethoxysilane is used in coatings and paints as an adhesion promoter to improve bonding to glass, metal oxides, and mineral substrates.
Vinyltrimethoxysilane is incorporated into primers to increase moisture resistance and reduce delamination in compatible coating systems.
Vinyltrimethoxysilane is used in sealants and adhesives to improve adhesion and durability on inorganic surfaces.

Vinyltrimethoxysilane is used in crosslinkable polymer systems in selected applications to improve cure efficiency and network formation.
Vinyltrimethoxysilane is incorporated into moisture-curing systems where silane hydrolysis and condensation create siloxane crosslinks.
Vinyltrimethoxysilane is used in reactive formulations where improved interfacial bonding supports improved mechanical performance.

Vinyltrimethoxysilane is valued because Vinyltrimethoxysilane provides a reactive silane interface that bonds to inorganic surfaces while providing vinyl reactivity or grafting capability in organic polymer matrices.

Vinyltrimethoxysilane is used as a silane coupling agent in polymer composites.
Vinyltrimethoxysilane improves adhesion between organic polymers and inorganic substrates.
Vinyltrimethoxysilane is used in glass fiber treatment.
Vinyltrimethoxysilane helps improve bonding between glass fibers and resin matrices.

Vinyltrimethoxysilane is used in fiberglass-reinforced plastic production.
Vinyltrimethoxysilane supports improved interfacial strength in composite materials.
Vinyltrimethoxysilane is used in mineral-filled plastic formulations.
Vinyltrimethoxysilane improves compatibility between polymer matrices and mineral fillers.

Vinyltrimethoxysilane is used in polyethylene crosslinking applications.
Vinyltrimethoxysilane enables moisture-curable silane-grafted polyethylene systems.
Vinyltrimethoxysilane is used in wire and cable insulation compounds.
Vinyltrimethoxysilane improves thermal, mechanical, and electrical performance in crosslinked polyethylene insulation.

Vinyltrimethoxysilane is used in pipe and tubing materials.
Vinyltrimethoxysilane supports moisture-cured crosslinking in polyethylene pipe systems.
Vinyltrimethoxysilane is used in cable sheathing formulations.
Vinyltrimethoxysilane helps improve durability and resistance to environmental stress.

Vinyltrimethoxysilane is used in sealant formulations.
Vinyltrimethoxysilane improves adhesion to glass, metal, ceramic, and mineral substrates.
Vinyltrimethoxysilane is used in adhesive formulations.
Vinyltrimethoxysilane acts as an adhesion promoter in moisture-curing systems.

Vinyltrimethoxysilane is used in coating formulations.
Vinyltrimethoxysilane improves coating adhesion and water resistance.
Vinyltrimethoxysilane is used in primer formulations.
Vinyltrimethoxysilane helps prepare inorganic surfaces for bonding with organic materials.

Vinyltrimethoxysilane is used in construction chemical formulations.
Vinyltrimethoxysilane improves adhesion and durability in sealants, coatings, and repair compounds.
Vinyltrimethoxysilane is used in waterproofing formulations.
Vinyltrimethoxysilane supports improved water resistance on compatible mineral surfaces.

Vinyltrimethoxysilane is used in artificial stone and engineered stone systems.
Vinyltrimethoxysilane supports bonding between resin binders and mineral aggregates.
Vinyltrimethoxysilane is used in quartz composite formulations.
Vinyltrimethoxysilane helps improve mechanical strength and moisture resistance.

Vinyltrimethoxysilane is used in rubber compounding.
Vinyltrimethoxysilane improves compatibility between elastomers and silica or mineral fillers.
Vinyltrimethoxysilane is used in elastomer reinforcement systems.
Vinyltrimethoxysilane supports better filler-polymer interaction in selected rubber materials.

Vinyltrimethoxysilane is used in unsaturated polyester resin systems.
Vinyltrimethoxysilane improves bonding to glass, silica, and mineral fillers.
Vinyltrimethoxysilane is used in acrylic resin modification.
Vinyltrimethoxysilane introduces reactive silane functionality into polymer structures.

Vinyltrimethoxysilane is used in emulsion polymerization.
Vinyltrimethoxysilane can provide vinyl functionality for copolymer formation.
Vinyltrimethoxysilane is used in silane-modified polymer synthesis.
Vinyltrimethoxysilane supports the preparation of moisture-curable hybrid polymers.

Vinyltrimethoxysilane is used in surface modification of inorganic particles.
Vinyltrimethoxysilane helps make mineral surfaces more compatible with organic media.
Vinyltrimethoxysilane is used in ceramic and glass surface treatments.
Vinyltrimethoxysilane helps create organofunctional surface layers.

Vinyltrimethoxysilane is used in metal surface treatment systems.
Vinyltrimethoxysilane improves adhesion between metal surfaces and organic coatings.
Vinyltrimethoxysilane is used in anticorrosion coating systems.
Vinyltrimethoxysilane helps enhance barrier properties and coating durability.

Vinyltrimethoxysilane is used in pigment and filler dispersion systems.
Vinyltrimethoxysilane improves wetting and dispersion of inorganic solids in organic formulations.
Vinyltrimethoxysilane is used in specialty resin synthesis.

DESCRIPTION

Vinyltrimethoxysilane is an organosilane with a vinyl group and three methoxy groups bonded to silicon, and the methoxy groups hydrolyze in the presence of water to form silanol groups that can condense to siloxane bonds.
Vinyltrimethoxysilane acts as a coupling agent by bonding to hydroxylated inorganic surfaces such as glass or silica through siloxane linkages, and the vinyl functionality enables grafting or integration into organic polymer networks.
Vinyltrimethoxysilane performance depends on controlled hydrolysis and condensation, and pH, water content, and catalysts strongly influence reaction rate and final bonding quality.

Vinyltrimethoxysilane hydrolysis releases methanol, and this creates safety considerations related to flammability and toxicity, so ventilation and exposure control are important.
Vinyltrimethoxysilane is moisture sensitive and can polymerize or gel if exposed to water, so storage should minimize humidity and containers should be tightly sealed.
Vinyltrimethoxysilane should be used according to applicable regulations and good industrial hygiene practices for the target market and facility.

Vinyltrimethoxysilane should be stored away from strong acids and bases unless compatibility is verified, because catalysts and pH can accelerate hydrolysis and condensation.
Vinyltrimethoxysilane should be handled with dry equipment and controlled addition to prevent premature gelation or loss of activity.
Vinyltrimethoxysilane should be kept away from strong oxidizers and ignition sources due to solvent-like flammability behavior.

Vinyltrimethoxysilane is an organofunctional silane containing vinyl and trimethoxy groups.
Vinyltrimethoxysilane is also known as trimethoxyvinylsilane.
Vinyltrimethoxysilane is typically supplied as a clear, colorless liquid.
Vinyltrimethoxysilane has a characteristic alcohol-like or ester-like odor.

Vinyltrimethoxysilane is reactive toward moisture because of its methoxy groups.
Vinyltrimethoxysilane can hydrolyze to form silanol groups.
Vinyltrimethoxysilane can undergo condensation to form siloxane bonds.
Vinyltrimethoxysilane can bond inorganic surfaces to organic polymer systems.

Vinyltrimethoxysilane contains a vinyl group that can participate in radical polymerization.
Vinyltrimethoxysilane is useful for grafting silane functionality onto polyolefins.
Vinyltrimethoxysilane is compatible with many resins, plastics, fillers, and mineral substrates.
Vinyltrimethoxysilane performance depends on hydrolysis conditions, catalyst system, and substrate surface chemistry.

Vinyltrimethoxysilane improves adhesion by forming chemical bridges at material interfaces.
Vinyltrimethoxysilane can improve moisture resistance in reinforced and filled polymers.
Vinyltrimethoxysilane can improve mechanical strength in composite systems.
Vinyltrimethoxysilane can help reduce filler agglomeration in selected formulations.

Vinyltrimethoxysilane should be stored in tightly sealed containers.
Vinyltrimethoxysilane should be protected from moisture, heat, and incompatible materials.
Vinyltrimethoxysilane may release methanol during hydrolysis.
Vinyltrimethoxysilane should be handled with suitable ventilation and protective equipment.

Vinyltrimethoxysilane is flammable and should be kept away from ignition sources.
Vinyltrimethoxysilane quality may be defined by purity, color, moisture content, and hydrolyzable chlorine level.
Vinyltrimethoxysilane is valued for combining polymer-reactive vinyl functionality with inorganic-reactive silane chemistry.

PROPERTIES

Chemical Formula: C5H12O3Si
Molecular Weight: 148.22 g/mol
Common Name: Vinyltrimethoxysilane (VTMS)
Chemical Type: Organosilane coupling agent; adhesion promoter; crosslinking silane
Appearance: Clear, colorless liquid
Odor: Characteristic odor
Solubility: Reacts with water (hydrolysis); soluble in many organic solvents; limited stability in water
Boiling Point: ~123–127°C (typical)
Flash Point: ~23–27°C (typical; flammable; grade dependent)
Density: ~0.97 g/cm³ (typical at 20°C)
Reactivity: Hydrolyzes with moisture; releases methanol; condenses to siloxanes
Stability: Moisture sensitive; store dry and tightly sealed
Storage Temperature: 5–25°C, tightly closed, dry, well-ventilated, away from ignition sources
Shelf Life: Typically 12–24 months in original sealed packaging (supplier dependent)

FIRST AID

Inhalation:
Move to fresh air immediately.
Seek medical attention if symptoms such as headache, dizziness, or breathing discomfort occur.
Avoid breathing vapors because hydrolysis can release methanol and irritating silane vapors.

Skin Contact:
Remove contaminated clothing and wash skin with soap and water.
Seek medical advice if irritation develops or persists.
Avoid prolonged contact because organosilanes and methanol can irritate skin.

Eye Contact:
Rinse cautiously with water for at least 15 minutes.
Remove contact lenses if present and easy to do, then continue rinsing.
Seek immediate medical attention because eye exposure can be serious.

Ingestion:
Rinse mouth with water and do not induce vomiting.
Seek immediate medical attention or contact a poison center.
Never give anything by mouth to an unconscious person.

Note to Physicians:
Treat symptomatically.
Consider methanol exposure risk from hydrolysis products in significant exposures.
Provide supportive care as needed.

HANDLING AND STORAGE

Handling:
Use appropriate PPE including chemical-resistant gloves, goggles or face shield, and protective clothing.
Work with dry equipment and minimize exposure to moisture and humidity.
Eliminate ignition sources and use grounding/bonding because the material is flammable and may release methanol.

Ventilation:
Use local exhaust ventilation to control vapor levels.
Avoid handling in confined spaces without adequate ventilation.
Use explosion-proof ventilation and equipment where flammable vapors may be present.

Storage:
Store in tightly closed containers in a cool, dry, well-ventilated flammable liquids area.
Protect from moisture to prevent hydrolysis and methanol release and to preserve activity.
Segregate from strong oxidizers and from acids or bases that can accelerate hydrolysis.

Spill and Leak Procedures:
Eliminate ignition sources and ventilate the area.
Contain spill with inert absorbent and collect into approved containers.
Prevent entry into drains and dispose of waste according to local regulations and facility procedures.

Handling Precautions:
Control moisture exposure because Vinyltrimethoxysilane hydrolyzes and can lose activity and generate methanol if exposed to water.
Optimize addition and catalyst conditions because hydrolysis/condensation control determines coupling performance and crosslink efficiency.
Use trained handling procedures for flammable, moisture-sensitive chemicals to minimize exposure risk and maintain product performance.