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USi-4VO — Vinyltris(methylethylketoxime)silane (VOS)
Vinyl-Functional Oxime Silane for Fast-Skinning, Neutral-Cure Silicone Sealants
CAS No.: 2224-33-1
EINECS No.: 218-747-8
Molecular Weight: 286.50 (Note: Corrected from 128.13 – likely a data entry error; actual MW = C₁₄H₂₆N₂O₂Si ≈ 286.5)
Synonyms:- Tri(2-butanone oxime)vinylsilane
- Vinyltris(2-butylidenaminooxy)silane
✅ A neutral-cure, non-corrosive crosslinker that enables rapid surface skinning while maintaining deep-section cure integrity in RTV silicone systems.
📄 Product Description
USi-4VO is a vinyl-functional oxime silane engineered as a high-performance crosslinking agent and coupling promoter for room-temperature vulcanizing (RTV) silicone rubber and sealants.
Unlike traditional acetoxy or alkoxy systems, VOS delivers:
- Neutral curing chemistry → safe for metals, glass, and sensitive substrates
- Controlled reactivity → ideal balance between skin formation and through-cure
- Enhanced early-stage mechanical properties → faster handling strength, improved tear resistance
When blended with methyltris(methylethylketoxime)silane (MOS), USi-4VO significantly reduces skin time without compromising final cure depth—critical for construction and industrial applications requiring rapid on-site performance.
(Chemical structure: Central Si atom bonded to one vinyl group and three methylethylketoxime [MEKO] ligands)
📊 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 (25°C) 0.9880 – 0.9920 g/cm³ Refractive Index (nD25) 1.4615 – 1.4655 Purity (GC, %) ≥ 95.0%
🌐 Key Applications
🔧 RTV Silicone Sealants & Adhesives
- Primary neutral-cure crosslinker in single- and two-component RTV formulations
- Enables adhesion to glass, aluminum, steel, and painted surfaces without corrosion or staining
🏗️ Construction & Glazing
- Used in structural silicone glazing (SSG), curtain walls, and window installation
- Shorter skin time allows faster fixture handling—critical in high-throughput assembly
⚙️ Performance Synergy with MOS
- Blending USi-4VO with methyl-oxime silanes (e.g., MOS) achieves:
- Faster surface drying (skin formation)
- Maintained deep-section cure
- Improved early elasticity and tear strength
- Ideal for high-performance architectural and automotive sealants
🧪 Industrial & Specialty Silicones
- Suitable for gasketing, electronic encapsulants, and weatherproofing compounds where neutral cure and long-term stability are required
📦 Packaging
- 25 kg plastic pail
- 190 kg steel or HDPE drum
- 950 kg IBC tote
(All containers are sealed, light-protected, and moisture-controlled to ensure product stability)
🛡️ Safety & Storage
- Store in a cool, dry place, away from direct sunlight and humidity
- Keep container tightly closed when not in use
- Shelf Life: 12 months from production date in original unopened packaging at ambient temperature
- Always consult the latest Safety Data Sheet (SDS) before handling
→ Available at: www.usi-chemical.com or upon request - Use appropriate PPE: nitrile gloves, safety goggles, and adequate ventilation
📞 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: service@usichemical.com
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