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Silane USi-3301 – γ-Methacryloxypropyltrimethoxysilane
Methacrylate-Functional Methoxysilane for Polymer Reinforcement & Adhesion Promotion
CAS No.: 2530-85-0
EINECS No.: 219-785-8
Molecular Weight: 248.35 g/mol
Synonyms:
3-Trimethoxysilylpropyl methacrylate;
[3-(Methacryloyloxy)propyl]trimethoxysilane
Equivalent: Silquest® A-174 (Momentive); Z-6030 (Dow)Silane USi-3301 is a dual-functional coupling agent featuring a polymerizable methacrylate group and three hydrolyzable methoxy groups. It enables covalent bonding between inorganic fillers/fibers and organic resin matrices—significantly enhancing mechanical properties, filler dispersion, and moisture resistance in composites and coatings.
🧪 Product Description
Chemical Formula: C₁₀H₂₀O₅Si
Chemical Structure:
![Structure: CH₂=C(CH₃)COO–(CH₂)₃–Si(OCH₃)₃]USi-3301 acts as a molecular bridge:
- The methacrylate end copolymerizes with acrylics, unsaturated polyesters, vinyl esters, and other free-radical-curable resins
- The trimethoxysilyl end bonds to glass, minerals, and metal oxides via siloxane linkages
This dual reactivity makes it indispensable in high-performance filled and fiber-reinforced systems.
📊 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 Transparent liquid Specific Gravity (20°C) 1.040 – 1.050 g/cm³ Refractive Index (nD25) 1.4240 – 1.4340 Purity (GC, %) ≥ 98.0%
🏭 Key Applications
🔹 Glass Fiber Sizing & Treatment
- Essential component in sizings for glass fibers used in:
- Unsaturated polyester (UPR)
- Polyolefins (PP, PE)
- Improves fiber-matrix adhesion → boosts tensile/flexural strength in composites
🔹 Mineral & Pigment Surface Modification
- Treats fillers such as calcium carbonate, talc, silica, ATH for:
- Better dispersion in thermosets (UPR, MMA) and thermoplastics (polyesters, polyolefins)
- Reduced sedimentation and viscosity in filled resins
- Enhanced moisture resistance and acid/base stability
🔹 Free-Radical Curable Systems
- Used as a reactive co-monomer in:
- UV/EB-curable coatings & inks
- Acrylic pressure-sensitive adhesives (PSAs)
- Dental & optical resins
- Imparts scratch, abrasion, and wet scrub resistance to cured films
🔹 Casting & Encapsulation Resins
- Reduces melt viscosity in UPR and MMA casting systems
- Enables higher filler loading without compromising flow or cure
📦 Packaging
Available in industrial-grade containers:
- 25 kg pail
- 200 kg drum
- 1,000 kg IBC tote
All packaging ensures moisture protection to maintain product reactivity.
⚠️ Safety & Storage
- Store in original unopened containers at or below 35°C
- Keep away from heat and open flame (product is combustible)
- Shelf Life: 12 months from production date under recommended conditions
- Use appropriate PPE (gloves, goggles) and handle in well-ventilated areas
- 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 Methacryloxy & Organofunctional 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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