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USi-2302 — γ-Glycidyloxypropyltriethoxysilane (GPS)
Dual-Reactive Epoxy Silane for Superior Adhesion, Composite Performance & Electronic Reliability
CAS No.: 2602-34-8
EINECS No.: 220-011-6
Molecular Weight: 278.42
Synonyms:- 3-(2,3-Epoxypropoxy)propyltriethoxysilane
- γ-GPS, GPTES
✅ The industry-standard epoxy-functional organosilane—bridging inorganic substrates and organic polymers with unmatched durability in wet, acidic, or high-stress environments.
📄 Product Description
USi-2302 features a reactive epoxy ring at one end and three hydrolyzable ethoxy groups at the other, enabling dual functionality:
- Epoxy group: Covalently bonds with epoxy resins, polyurethanes, acrylics, phenolics, and other polymers containing –OH, –NH₂, or carboxyl groups
- Triethoxysilane group: Hydrolyzes to form silanols that condense with –OH-rich surfaces (glass, metals, minerals, concrete)
This molecular “bridge” creates a hydrolytically stable Si–O–substrate bond and a chemically integrated polymer interface, delivering long-term adhesion even under harsh conditions.
(Chemical structure: OCH₂–CH–CH₂–O–(CH₂)₃–Si(OC₂H₅)₃)
📊 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 (20°C) 0.999 – 1.009 g/cm³ Refractive Index (nD20) 1.4220 – 1.4320 Purity (GC, %) ≥ 98.0%
🌟 Key Benefits & Performance Advantages
🔗 Unmatched Adhesion Promotion
- Dramatically improves bonding to glass, aluminum, steel, ceramics, and concrete
- Prevents delamination in humid or immersed conditions
- Ideal for structural adhesives, automotive sealants, and aerospace composites
🧱 Enhanced Filler-Matrix Compatibility
- Treats silica, talc, clay, CaCO₃, and other mineral fillers to:
- Reduce sedimentation & agglomeration
- Enable higher filler loading (up to 70 wt%)
- Lower compound viscosity → easier processing
- Improves tensile/flexural strength, impact resistance, and dimensional stability
⚡ Superior Electrical Properties in Electronics
- In potting compounds, encapsulants, and underfills:
- Maintains high volume resistivity
- Stabilizes dielectric constant
- Prevents moisture-induced leakage currents
🛡️ Chemical & Environmental Resistance
- Imparts excellent resistance to:
- Water immersion
- Acids & alkalis
- Thermal cycling
- Critical for outdoor coatings, marine adhesives, and industrial flooring
🏭 Key Applications
🧵 Glass Fiber Sizing & Composites
- Used in sizing formulations for E-glass fibers in:
- Wind turbine blades
- Automotive body panels
- Pipes & tanks
- Boosts interlaminar shear strength (ILSS) and fatigue life
🧪 Foundry & Polyurethane Resins
- Added to PU-based foundry binders to improve:
- Green strength
- Shakeout performance
- Core durability in humid storage
🎨 Adhesives, Sealants & Coatings
- As additive or primer in:
- Epoxy structural adhesives
- Silicone/PU hybrid sealants
- Industrial maintenance coatings
- Ensures long-term adhesion to metal/glass, even after salt spray or boiling water tests
⚙️ Mineral-Filled Plastics & Elastomers
- Pretreats fillers for use in:
- Engineering thermoplastics (PA, PBT)
- EPDM, silicone rubber
- Unsaturated polyester (UP) molding compounds
- Reduces water uptake by >50% vs. untreated systems
💻 Electronic Encapsulation & Potting
- Enhances reliability of:
- LED modules
- Power electronics
- Sensors & connectors
- Minimizes interfacial voids and CTE mismatch stress
📦 Packaging
- 25 kg HDPE pail
- 200 kg steel drum
- 1000 kg IBC tote
(All containers are sealed under dry nitrogen and labeled for industrial handling)
🛡️ Safety & Storage
- Flammable liquid – keep away from heat, sparks, and open flame
- Store at ambient temperature in a dry, well-ventilated area
- Shelf Life: 24 months from production date in original unopened 200 kg drums
- Use PPE: nitrile gloves, safety goggles, and adequate ventilation
- Always consult the latest Safety Data Sheet (SDS)
→ Available at: www.usi-chemical.com or upon request
📞 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: inquiry@usichemical.com
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