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USi-6MO — Methyltris(methylethylketoxime)silane (MOS)
The Standard Neutral Crosslinker for High-Performance Oxime-Cure Silicone Sealants
CAS No.: 22984-54-9
EINECS No.: 245-366-4
Molecular Weight: 301.46
Synonyms:- Butan-2-one O,O',O''-(methylsilylidyne)trioxime
- Methyltris(2-butanone oxime)silane
✅ A non-organoreactive alkyl silane with three methylethylketoxime (MEKO) groups—engineered as the primary crosslinker in neutral-cure RTV silicone systems.
📄 Product Description
USi-6MO is a methyl-functional oxime silane specifically designed to crosslink silanol-terminated polydimethylsiloxane (PDMS) in the presence of atmospheric moisture. As a non-organoreactive alkyl silane, it contains no vinyl, epoxy, or amino groups—ensuring formulation stability while delivering reliable, neutral cure performance.
Key benefits:
- Neutral curing chemistry → non-corrosive, non-staining, safe for metals and sensitive substrates
- Controlled reactivity → tunable cure speed when used alone or blended with other oxime silanes (e.g., VOS, TOS)
- Excellent adhesion to glass, aluminum, ceramics, and many plastics without primers
- Low odor and color stability—ideal for architectural and consumer-facing applications
(Chemical structure: Central silicon atom bonded to one methyl 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 transparent liquid Specific Gravity (25°C) 0.960 – 0.980 g/cm³ Refractive Index (nD25) 1.4450 – 1.4650 Purity (GC, %) ≥ 95.0%
🌐 Key Applications
🔧 Oxime-Cure Silicone Sealants (RTV-1 & RTV-2)
- Primary crosslinker in neutral-cure formulations for construction, automotive, and industrial use
- Reacts with moisture to release methylethylketoxime (MEKO)—a low-odor, non-acidic byproduct
🏗️ Architectural & Structural Glazing
- Used in curtain walls, window installation, and glass bonding where long-term durability and non-corrosiveness are critical
- Maintains clarity and adhesion under UV exposure and thermal cycling
⚙️ Customizable Cure Profiles
- Can be used alone for balanced cure or blended with:
- VOS (vinyl-oxime silane) → faster skin formation, improved early strength
- TOS (tetra-oxime silane) → enhanced tensile properties, reduced shrinkage
- Enables formulators to tailor cure rate, elasticity, and adhesion to specific application needs
🧪 Industrial & Specialty Silicones
- Suitable for gasketing, electronic encapsulation, HVAC sealing, and marine applications
- Compatible with common fillers (fumed silica, CaCO₃), plasticizers, and adhesion promoters
📦 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 integrity)
🛡️ 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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