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Silane USi-5302 – γ-Mercaptopropyltriethoxysilane
Mercapto-Functional Ethoxysilane for Rubber Reinforcement & Adhesion Promotion
CAS No.: 14814-09-6
EINECS No.: 238-883-1
Molecular Weight: 238.42 g/mol
Synonyms:
3-Triethoxysilyl-1-propanethiol;
γ-Mercaptopropyl triethoxy silaneSilane USi-5302 is a thiol (sulfhydryl)-functional coupling agent featuring a reactive –SH group and three hydrolyzable ethoxy groups. It provides superior coupling between inorganic fillers (especially silica) and organic polymers—making it a key performance additive in high-end rubber compounds, sealants, and adhesives.
🧪 Product Description
Chemical Formula: C₉H₂₂O₃SSi
Chemical Structure:
![Structure: HS–(CH₂)₃–Si(OC₂H₅)₃]USi-5302 leverages the strong affinity of the sulfhydryl (–SH) group for unsaturated rubber chains and metal oxides, while its triethoxysilyl group bonds covalently to silica, glass, and mineral surfaces. Compared to methoxy analogs (e.g., USi-5301), the ethoxy groups hydrolyze more slowly, offering:
- Better processing safety
- Extended pot life in formulations
- Reduced volatility and odor intensity
This balance makes it ideal for demanding rubber and sealant applications.
📊 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) 0.988 – 0.998 g/cm³ Refractive Index (nD25) 1.4281 – 1.4381 Purity (GC, %) ≥ 98.0%
🏭 Key Applications
🔹 Silica-Reinforced Tire Tread Compounds
- Significantly reduces rolling resistance → improves fuel efficiency
- Enhances wet grip and abrasion resistance
- Enables high-silica “green tire” formulations without compromising processability
🔹 Sealants & Adhesives
- Improves adhesion to glass and metal in:
- Polysulfide sealants
- Polyurethane (PU) sealants
- Promotes durable interfacial bonding in construction and automotive glazing
🔹 Mineral-Reinforced Rubber Goods
- Used in shoe soles, industrial rollers, hoses, and belts filled with:
- Silica
- Calcium carbonate
- Clay
- Boosts tensile strength, tear resistance, and flex fatigue life
🔹 Compatible Polymer Systems
- Effective in a wide range of elastomers and resins, including:
✅ Butyl rubber
✅ Nitrile rubber (NBR)
✅ Neoprene
✅ Styrene-Butadiene Rubber (SBR)
✅ Epoxy
✅ Phenolic
✅ Polysulfide
✅ Polyurethane
📦 Packaging
Available in industrial-grade containers:
- 25 L pail
- 200 L drum
- 1,000 L IBC tote
All packaging ensures moisture protection to maintain product stability.
⚠️ 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 exhibit 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.
Your Trusted Source for High-Performance Mercapto Silanes- 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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