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Silane USi-801 – Phenyltrimethoxysilane
Phenyl-Functional Alkoxysilane for Enhanced Thermal Stability & Hydrophobic Modification
CAS No.: 2996-92-1
EINECS No.: 221-066-9
Molecular Weight: 198.29 g/mol
Synonyms: TrimethoxysilylbenzeneSilane USi-801 is a phenyl-functional organosilane that combines the thermal stability of an aromatic ring with the reactivity of three methoxy groups. It serves as a versatile intermediate, coupling agent modifier, and hydrophobicity enhancer in high-performance silicone and composite systems.
🧪 Product Description
Chemical Formula: C₆H₅Si(OCH₃)₃
Chemical Structure:
![Phenyltrimethoxysilane structure: Benzene ring attached to Si(OCH₃)₃]USi-801 features a phenyl group directly bonded to silicon, offering superior thermal resistance, UV stability, and refractive index control compared to alkyl silanes. Its three hydrolyzable methoxy groups enable robust condensation with silica surfaces, silanols, or other silanes—making it ideal for sol-gel processes and surface modification.
📊 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) 1.062 – 1.072 g/cm³ Refractive Index (nD20) 1.4680 – 1.4780 Purity (GC, %) ≥ 98.0%
🏭 Key Applications
🔹 Surface Modification of Inorganic Fillers
USi-801 effectively treats fillers such as:
- Wollastonite
- Aluminum trihydroxide (ATH)
- Silica, talc, and other mineral fillers
By grafting phenyl groups onto filler surfaces, it:
- Enhances hydrophobicity
- Improves dispersibility in polymer matrices
- Reduces moisture sensitivity
- Enables better performance in high-temperature processing (e.g., engineering plastics, cables, composites)
🔹 Silane & Siloxane Intermediate
Used to synthesize:
- Phenyl-modified siloxane resins
- Hybrid organic-inorganic polymers
- Heat-resistant silicone fluids and coatings
🔹 Thermal Stabilizer for Other Silanes
The aromatic phenyl group significantly boosts thermal stability of silane blends—ideal for applications requiring long-term performance above 200°C.
🔹 Sol-Gel Processing Aid
- Reduces polymer melt viscosity in sol-gel formulations
- Can be partially pre-hydrolyzed to form stable prepolymers
- Often co-hydrolyzed with:
- Alkyl silanes (e.g., MTMS, TEOS)
- Other organofunctional silanes
- Aqueous silica sols
→ Enables tailored crosslink density, flexibility, and thermal properties in final networks.
📦 Packaging
Available in industrial-grade, light-protected containers:
- 25 L HDPE pail
- 200 L steel drum
- 1,000 L IBC tote
All packaging is sealed to prevent moisture ingress and light exposure.
⚠️ Safety & Storage
- Store in a cool, dry place, away from direct sunlight
- Keep container tightly closed to avoid moisture absorption (methoxy groups are hydrolyzable)
- Shelf Life: 12 months from production date in original unopened containers at ambient temperature
- Use appropriate PPE: gloves, safety goggles, and adequate ventilation
- 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 High-Performance Organosilanes & Silicone Intermediates- 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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