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Silane USi-5301 – γ-Mercaptopropyltrimethoxysilane
Mercapto-Functional Methoxysilane for Metal Protection, Rubber Reinforcement & Adhesion
CAS No.: 4420-74-0
EINECS No.: 224-588-5
Molecular Weight: 196.34 g/mol
Synonyms:
3-Mercaptopropyltrimethoxysilane; MPTMSSilane USi-5301 is a thiol (sulfhydryl)-functional coupling agent featuring a reactive –SH group and three hydrolyzable methoxy groups. It forms strong covalent bonds with noble metals (Au, Ag, Cu) and inorganic fillers—delivering exceptional anti-corrosion performance, rubber reinforcement, and interfacial adhesion in demanding industrial applications.
🧪 Product Description
Chemical Formula: C₆H₁₄O₃SSi
Chemical Structure:
![Structure: HS–(CH₂)₃–Si(OCH₃)₃]The sulfhydryl (–SH) group in USi-5301 has high affinity for metal surfaces and unsaturated rubber chains, while the trimethoxysilyl group anchors to glass, silica, and metal oxides. This dual functionality enables:
- Ultra-thin, self-assembled monolayers (SAMs) on metals
- Efficient coupling between inorganic fillers and elastomers
- Enhanced compatibility in composite interfaces
Note: Product may have a characteristic sulfurous odor due to the mercapto group.
📊 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 Colour (Pt-Co) ≤ 25 Specific Gravity (20°C) 1.020 – 1.060 g/cm³ Refractive Index (nD25) 1.4410 – 1.4450 Purity (GC, %) ≥ 98.0%
🏭 Key Applications
🔹 Metal Surface Treatment & Anti-Corrosion
- Forms protective monolayers on gold, silver, copper, and other metals
- Provides anti-oxidant and anti-tarnish properties
- Enhances adhesion of resins, paints, and coatings to metal substrates
🔹 Rubber Reinforcement (Tire & Industrial Elastomers)
- Used to pre-treat inorganic fillers such as:
- White carbon black (silica)
- Carbon black
- Fiberglass, mica, clay
- Significantly improves:
- Mechanical strength (tensile, tear)
- Abrasion & wear resistance
- Dispersion stability in rubber compounds
🔹 Textile Finishing
- Applied in shrink-proof finishing of wool and other natural fibers
- The –SH group reacts with disulfide bonds in keratin, stabilizing fiber structure
🔹 Adhesion Promoter in Composites & Sealants
- Enhances bonding between macromolecules (resins) and inorganic surfaces
- Useful in epoxy, silicone, and polyurethane systems requiring metal/filler adhesion
📦 Packaging
Available in industrial-grade containers:
- 25 kg pail
- 200 kg drum
- 1,000 kg IBC tote
All packaging is sealed to minimize moisture exposure and odor release.
⚠️ 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
- Use in well-ventilated areas; product has a distinct sulfurous odor
- Wear appropriate PPE (gloves, goggles, respirator if needed)
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Specialist in Mercapto & Specialty Functional 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: inquiry@usichemical.com
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