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USi-4TO — Tetra(methylethylketoxime)silane (TOS)
Neutral, Non-Yellowing Crosslinker for High-Performance Silicone Sealants
CAS No.: 34206-40-1
EINECS No.: 251-882-0
Molecular Weight: 372.54
Synonyms:- Tetrakis(methylethylketoxime)silane
- Tetrakis(butanone oxime)silane
📄 Product Description
USi-4TO is a vinyl-functional alkoxysilane alternative and neutral oxime-type crosslinker widely used in room-temperature vulcanizing (RTV) silicone formulations. Unlike traditional alkoxy or acetoxy systems, TOS enables:
- Color stability – prevents yellowing during aging or heat exposure
- Neutral cure chemistry – non-corrosive, ideal for sensitive substrates (e.g., metals, electronics)
- Excellent compatibility with MOS (methyltris(methylethylketoxime)silane) for balanced cure speed and mechanical properties
✅ Ideal for high-clarity, non-staining, and long-term durable sealants
✅ Suitable for applications where catalysts are restricted or undesirable(Chemical structure: Central silicon atom bonded to four methylethylketoxime [MEKO] groups)
📊 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 White crystalline solid Purity (GC, %) ≥ 98.0% 💡 Note: USi-4TO is typically melted or dissolved before incorporation into silicone base polymers.
🌐 Key Applications
🔧 Silicone Sealants & Adhesives
- Used as a neutral curing agent in RTV-1 and RTV-2 silicone formulations
- Often blended with MOS to:
- Accelerate surface and through-cure
- Enhance tensile strength and elongation
- Reduce internal stress and cracking during cure
🎨 Non-Yellowing Formulations
- Preferred over vinyltriacetoxysilane (VOS) or other acidic crosslinkers in applications requiring long-term color stability (e.g., architectural glazing, white sealants)
⚙️ Catalyst-Free Systems
- Enables curing without tin or titanium catalysts—ideal for:
- Electronics encapsulation
- Medical-grade silicones
- Regulatory-compliant building materials
🏗️ Construction & Automotive
- Used in structural glazing, window sealing, and automotive gasketing where non-corrosiveness and weather resistance are critical
📦 Packaging
- 25 kg plastic pail
- 200 kg steel drum
(Containers are sealed, light-protected, and labeled for industrial handling)
🛡️ Safety & Storage
- Store in a cool, dry, dark place in original unopened containers
- Avoid exposure to moisture (may initiate premature reaction)
- Shelf Life: 12 months from production date at ambient temperature
- Always consult the latest Safety Data Sheet (SDS) before use
→ Available at: www.usi-chemical.com or upon request - Use appropriate PPE: gloves, eye protection, and dust mask when handling solid form
📞 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: lydia@usichemical.com
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