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USi-4VO — Vinyltris(methylethylketoxime)silane (VOS)
Mild, Oxime-Based Crosslinker for Neutral-Cure Silicone Systems
CAS No.: 2224-33-1
EINECS No.: 218-747-8
Molecular Weight: 286.50 (Note: corrected from 128.13 – likely a typo; actual MW ≈ 286.5)
Synonyms:- Tri(2-butanone oxime)vinylsilane
- Vinyltris(2-butylidenaminooxy)silane
ℹ️ Commonly used in RTV silicone formulations as a non-corrosive, neutral-cure crosslinker with good storage stability and balanced reactivity.
📄 Product Description
USi-4VO is a vinyl-functional oxime silane designed as a mild crosslinking agent for room-temperature vulcanizing (RTV) silicone systems. It combines:
- A reactive vinyl group that integrates into the silicone polymer backbone
- Three methylethylketoxime (MEKO) leaving groups that enable neutral, non-acidic curing
✅ Ideal for silicone sealants, glass adhesives, and construction-grade RTV rubbers
✅ Offers excellent compatibility, controlled cure speed, and reduced odor vs. acetoxy systems(Chemical structure: Si center bonded to one vinyl group and three 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 to pale yellow 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 Rubber & Sealants
- Primary crosslinker (vulcanizing agent) in neutral-cure RTV-1 and RTV-2 formulations
- Enables adhesion to glass, metals, and plastics without corrosion
🪟 Silicone Glass Adhesives
- Widely used in structural glazing, aquarium bonding, and architectural glass assembly
- Provides long-term durability with minimal shrinkage or stress cracking
🏗️ Construction & Industrial Sealants
- Preferred over acetoxy silanes where non-staining and non-corrosive properties are required
- Compatible with common fillers (e.g., CaCO₃, fumed silica) and plasticizers
⚖️ Balanced Reactivity
- Milder than alkoxy or acetoxy crosslinkers → extended pot life and smoother processing
- Often used in combination with TOS (tetrakis-oxime silane) to fine-tune cure profile and mechanical strength
📦 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 prevent premature hydrolysis)
🛡️ Safety & Storage
- Store in a cool, dry place, away from direct sunlight and moisture
- Keep container tightly closed when not in use
- Shelf Life: 12 months from production date in original unopened packaging at ambient temperature
- Always refer to 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 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: inquiry@usichemical.com
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