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USi-401 — Vinyltrimethoxysilane (VTMS)
Versatile Vinyl-Functional Alkoxysilane for Crosslinking, Adhesion & Moisture Scavenging
CAS No.: 2768-02-7
EINECS No.: 220-449-8
Molecular Weight: 148.23
Synonyms:- (Trimethoxysilyl)ethylene
- Ethenyltrimethoxysilane
- Trimethoxy(vinyl)silane
✅ A dual-functional silane combining a hydrolyzable trimethoxysilyl group and a polymerizable vinyl group—enabling covalent bonding to both inorganic substrates and organic polymers.
📄 Product Description
USi-401 is a vinyl-functional alkoxysilane widely used as a crosslinker, adhesion promoter, co-monomer, and moisture scavenger across multiple high-performance industries.
Its unique structure allows it to:
- React with hydroxylated surfaces (glass, metals, minerals) via silanol condensation
- Co-polymerize with organic resins (acrylics, styrenics, polyolefins) through the vinyl group
- Scavenge trace moisture in formulations to enhance storage stability
This dual reactivity makes USi-401 indispensable in silane-crosslinked polyethylene (PE-Xb), moisture-cure sealants, and high-durability polymer dispersions.
(Chemical structure: CH₂=CH–Si(OCH₃)₃)
📊 Typical Technical Data
⚠️ Values are typical and for reference only. Not to be used for specification without prior written confirmation from our technical team.
Parameter Specification Appearance Colorless transparent liquid Specific Gravity (20°C) 0.960 – 0.980 g/cm³ Refractive Index (nD20) 1.3880 – 1.3980 Purity (GC, %) ≥ 98.0%
🌐 Key Applications
🔌 Silane-Crosslinked Polyethylene (PE-Xb)
- Used in hot-water pipes, cable insulation, and underfloor heating systems
- Imparts superior heat resistance, long-term hydrostatic strength, and electrical properties vs. non-crosslinked PE
- Crosslinking occurs via moisture-induced condensation after extrusion
🧱 Adhesion Promotion in Composites & Sealants
- Enhances bonding between mineral fillers (e.g., CaCO₃, silica) and polyolefin matrices
- Acts as a coupling agent in glass-fiber-reinforced plastics, rubber-to-metal bonding, and construction sealants
🎨 Polymer Dispersions & Coatings
- Serves as a reactive co-monomer in acrylic or styrene-acrylic emulsions
- Delivers:
- Excellent wet scrub resistance
- Higher abrasion resistance
- Strong adhesion to difficult substrates (concrete, metal, glass)
💧 Moisture Scavenging
- Rapidly reacts with residual water in polyurethane, epoxy, or silicone systems
- Prevents CO₂ foaming, viscosity drift, and premature curing
- Extends shelf life of moisture-sensitive formulations
🧪 Other Functional Uses
- Compatible with hydroxyl-containing polymers (e.g., polyesters, polyurethanes)
- Activated by proximity to silicon—enables surface modification of nanoparticles, pigments, and fillers
📦 Packaging
- 20 kg plastic pail
- 190 kg steel or HDPE drum
- 950 kg IBC tote
(All containers are nitrogen-purged and sealed to prevent moisture ingress and hydrolysis)
🛡️ Safety & Storage
- Keep away from heat, sparks, and open flame – flammable liquid
- Store at ≤ 35°C in a cool, dry, well-ventilated area
- Shelf Life: 24 months from production date in original unopened 200L drums
- Always consult the latest Safety Data Sheet (SDS) before handling
→ Available at: www.usi-chemical.com or upon request - Use appropriate PPE: chemical-resistant gloves, safety goggles, and respiratory protection if vapor exposure is possible
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
- Headquarters:
Room 2002, Overseas Chinese Plaza, No.1 Daqiao North Road, Nanjing 210031, Jiangsu, P.R. China - Factory Address:
Dongcheng Guanli District, Gaizhou 115200, Liaoning, P.R. China - Tel: +86-25-5889 5266 / 5889 5699
- Fax: +86-25-5830 5349
- Website: www.usi-chemical.com
- Email: inquiry@usichemical.com
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