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Silane USi-802 – Phenyltriethoxysilane
Phenyl-Functional Ethoxysilane for High-Temperature Stability & Filler Modification
CAS No.: 780-69-8
EINECS No.: 212-305-8
Molecular Weight: 240.37 g/mol
Synonyms: TriethoxyphenylsilaneSilane USi-802 is a phenyl-functional organosilane featuring three hydrolyzable ethoxy groups and a thermally stable aromatic ring. It delivers enhanced heat resistance, hydrophobicity, and compatibility in silicone systems, flame-retardant composites, and polyolefin catalysts.
🧪 Product Description
Chemical Formula: C₆H₅Si(OC₂H₅)₃
Chemical Structure:
![Phenyltriethoxysilane: Benzene ring bonded to Si(OCH₂CH₃)₃]USi-802 combines the thermal and UV stability of a phenyl group with the controlled reactivity of ethoxy functionalities. Compared to methoxy analogs, its ethoxy groups hydrolyze more slowly—offering better pot life in formulations while still enabling strong siloxane (Si–O–Si) network formation upon curing.
📊 Typical Technical Data
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) 0.991 – 1.001 g/cm³ Refractive Index (nD20) 1.4668 – 1.4768 Purity (GC, %) ≥ 97.0%
🏭 Key Applications
🔹 Halogen-Free Flame Retardant (HFFR) Cable Compounds
- Used as a surface modifier for aluminum trihydrate (ATH) filler
- Enhances hydrophobicity, reducing moisture uptake
- Improves dispersion in polymer matrices (e.g., EVA, PE)
- Enables higher filler loading without compromising mechanical properties
🔹 High-Temperature Silicone Elastomers
- Acts as a crosslinker or co-monomer in phenyl-containing silicone rubbers
- Boosts thermal stability (performance up to 250–300°C)
- Improves compression set resistance and low-temperature flexibility
🔹 Macromolecular Organosilicon Synthesis
- Serves as a building block for phenyl-modified siloxane resins, fluids, and gums
- Enables tailored refractive index, hardness, and thermal behavior in final products
🔹 Polypropylene (PP) Catalyst Systems
- Functions as an external electron donor (“A-donor”) in Ziegler-Natta catalysts
- Helps control stereoregularity, melt flow index (MFI), and polymer morphology
🔹 Hydrophobic Additive & Stabilizer
- Blended with other silanes to enhance thermal stability
- Used in sol-gel coatings, adhesives, and sealants requiring long-term durability
📦 Packaging
Available in light-protected, moisture-resistant containers:
- 25 L HDPE pail
- 200 L steel drum
- 1,000 L IBC tote
All packaging is nitrogen-blanketed where applicable and sealed to prevent hydrolysis.
⚠️ Safety & Storage
- Store in a cool, dry place, away from direct sunlight
- Keep container tightly closed—ethoxy groups are moisture-sensitive and may release ethanol upon hydrolysis
- Shelf Life: 12 months from production date in original unopened containers at ambient temperature
- Use appropriate PPE: chemical-resistant gloves, safety goggles, and adequate ventilation
- Always 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 Specialty Organosilanes- 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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