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Silane USi-5311 – γ-Mercaptopropylmethyldimethoxysilane
Mercapto-Functional Dimethoxysilane for Controlled Coupling & Enhanced Processability
CAS No.: 31001-77-1
EINECS No.: 250-426-8
Molecular Weight: 180.34 g/mol
Synonyms:
Dimethoxy-(3-mercaptopropyl)methylsilane;
3-(Dimethoxymethylsilyl)-1-propanethiolSilane USi-5311 is a uniquely structured mercapto-functional silane featuring one reactive sulfhydryl (–SH) group and two hydrolyzable methoxy groups on a methyl-substituted silicon center. Its tailored molecular design offers reduced crosslink density, enhanced hydrolytic stability, and excellent compatibility—making it ideal for high-performance sealants, rubber compounds, and adhesion-critical applications.
🧪 Product Description
Chemical Formula: C₆H₁₄O₂SSi
Chemical Structure:
![Structure: HS–(CH₂)₃–Si(CH₃)(OCH₃)₂]Unlike conventional trialkoxy mercapto silanes (e.g., USi-5301/5302), USi-5311 contains a non-hydrolyzable methyl group directly bonded to silicon. This structural feature delivers:
- Slower, more controlled condensation → improved formulation stability
- Lower volatility and reduced odor
- Better compatibility with low-polarity polymers
- Flexible interfacial layers that resist cracking under stress
The –SH group remains highly reactive toward unsaturated rubbers and metal surfaces, ensuring strong coupling performance.
📊 Typical Technical Data
The following values are typical and not intended for specification. Please confirm with our technical team before finalizing product requirements.
Parameter Specification Appearance Colorless transparent liquid Specific Gravity (20°C) 0.990 – 1.010 g/cm³ Refractive Index (nD25) 1.4452 – 1.4552 Purity (GC, %) ≥ 97.0%
🏭 Key Applications
🔹 Polysulfide & Polyurethane (PU) Sealants
- Significantly improves adhesion to glass and metal substrates
- Enhances long-term durability in construction glazing, automotive, and aerospace sealants
- Methyl group reduces brittleness at the interface → better stress relaxation
🔹 Silica-Reinforced Tire Tread Compounds
- Contributes to low rolling resistance for fuel-efficient “green tires”
- Balances wet grip, wear resistance, and process safety
- Slower hydrolysis minimizes scorch risk during mixing
🔹 Mineral-Reinforced Rubber Goods
- Used in high-value products such as:
- Shoe soles
- Industrial rollers
- Vibration dampeners
- Improves mechanical properties (tensile, tear) and abrasion resistance
🔹 Broad Polymer Compatibility
- Effective in a wide range of elastomers and resins, including:
✅ Butyl rubber
✅ Epoxy
✅ Neoprene
✅ Nitrile (NBR)
✅ Phenolic
✅ Polysulfide
✅ Polyurethane
✅ Styrene-Butadiene Rubber (SBR)
📦 Packaging
Available in industrial-grade containers:
- 25 L pail
- 200 L drum
- 1,000 L IBC tote
All packaging ensures moisture protection to preserve product integrity.
⚠️ Safety & Storage
- Store in original unopened containers at or below 35°C
- Keep away from heat and open flame
- Shelf Life: 12 months from production date under recommended conditions
- Product may have a mild sulfurous odor — handle in well-ventilated areas
- Use appropriate PPE (gloves, goggles)
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Innovator in Specialty Mercapto Silanes for Advanced Applications- 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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