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Home » Product » Silicone Resins » Phenyl Silicone Resins
Methyl Phenyl Silicone Resin
Methyl phenyl silicone resin is a high-performance organosilicon polymer with methyl and phenyl groups on a siloxane backbone. It offers excellent heat resistance, UV durability, and electrical insulation, making it ideal for high-temp coatings, insulation, and resin modification.
Product Overview
Methyl phenyl silicone resin is a high-performance, organosilicon polymer consisting of a siloxane backbone with methyl and phenyl substituents. This molecular architecture offers superior thermal resistance, excellent UV and weather durability, good electrical insulation, and enhanced compatibility with organic resins.
Due to its unique structure, it forms heat-resistant and durable coatings and is widely used in applications such as high-temperature paints, electrical insulation materials, and resin modification agents.
Typical Technical Specifications
| Property | Typical Value | Test Method / Notes |
|---|---|---|
| Appearance | Colorless to light yellow transparent liquid | Visual inspection |
| Viscosity (25 °C) | 100–13,000 cSt (varies by grade) | Brookfield viscometer |
| Phenyl Content | 3–29 mol % | Controlled by formulation |
| Refractive Index | 1.421–1.516 | Increases with phenyl content |
| Solids Content | 45–82 wt % (solvent-based grades) | Thermogravimetric method |
| Density (25 °C) | ~1.10 g/cm³ | ASTM D1475 |
| Flash Point | ≥225 °C (closed cup) | ASTM D93 |
| Thermal Stability | ≤5 % weight loss @ 250 °C for 3 hrs | TGA analysis |
Key Benefits
Exceptional Heat Resistance: Phenyl groups improve stability at temperatures >300 °C and enable long-term performance up to 650 °C.
Superior UV and Weatherability: Provides outstanding resistance to yellowing and degradation from sunlight and ozone exposure.
High Mechanical Strength: Forms tough, flexible films with excellent adhesion and crack resistance.
Excellent Resin Compatibility: Can be used as a modifier for organic resins to improve hardness, weathering, and film integrity.
Low VOC Options Available: Solvent-free or low-VOC grades available for eco-friendly formulations.
Recommended Grades
| Model / Grade | Solids Content | Viscosity | TEMP Resistance | Key Applications |
|---|---|---|---|---|
| R1152 / R1153 / RJ01 / RJ02 | 50 ± 1% | 25–75 s (Ford #4) | ≥200 °C (up to 600 °C) | Electrical insulation, high-heat coatings |
| SI-IC 900 | — | Low | Up to 600 °C | Thick-film industrial coatings, VOC compliance |
| SI- REN 60 | 60% | Medium | >600 °C | Corrosion-resistant high-temp coatings |
| SI-MP 50 E | — | — | ~600 °C | Eco-friendly waterborne high-temperature paints |
| SI–6602 / 6040 / 18007 | ~50% | 15–60 s | 200–500 °C | Class H insulation, coil varnish, topcoats |
| SI-6068 | — | Reactive | — | Crosslinking enhancer for epoxy/acrylic systems |
| SR-8805 | 45–55% | 100–180 cP | — | Decorative, maintenance, and oven-baked coatings |
Application Recommendations
Choosing the right Methyl Phenyl Silicone Resin depends on your performance and processing requirements. Here are suggested combinations for key applications:
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High-temperature metal coatings:
Use SI-IC 900 for thick-film, high-solids coatings. Offers outstanding heat resistance up to 600 °C, ideal for industrial metal surfaces. -
Low-VOC or waterborne heat-resistant coatings:
SI-M 51 E is a water-based solution for environmentally friendly coatings with excellent thermal performance. -
Anti-corrosion high-temperature coatings:
The SI-REN series provides excellent adhesion, chemical resistance, and durability in extreme environments. -
Electrical insulation varnishes and coil coatings:
Recommended options include Si-SR‑6602, Si-18007, and R1152 series. These resins deliver excellent dielectric strength and high thermal stability. -
Resin system modification and crosslinking:
Si‑6068 or similar silanol-functional intermediates can be used to improve crosslinking with other polymers like epoxy or acrylic resins.
Packaging & Storage
Packaging: Available in 200 kg steel drums or custom packaging on request.
Shelf Life: 12 months when stored in a cool, dry, and well-ventilated place away from direct sunlight.
Handling: Use personal protective equipment (PPE) including gloves and goggles. Ensure adequate ventilation during use.
Downloads & Documentation
TDS / SDS Available Upon Request
Customized Grades for OEM Formulations
Application Case Studies: High-Temp Coatings, LED Encapsulation
Jessica G.
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