Silicone Flame Retardant Additive
Silicone flame retardant additive is a polysiloxane-based compound that functions in the condensed phase by promoting formation of a cohesive, ceramic-like silica char layer during combustion. Unlike halogen or phosphorus-based FRs, silicone additives reduce heat release rate and smoke production while maintaining excellent electrical insulation and mechanical properties. They are particularly valued in high-performance engineering plastics and wire and cable applications.
Technical Specifications
| appearance | White powder or transparent viscous liquid |
| silicone content (%) | ≥95 |
| phosphorus content (%) | 0 |
| thermal stability (°C) | >250 |
| viscosity (mPa·s, 25°C) | 500–100000 |
Applications
- Polycarbonate and PC/ABS blends for electronics and automotive parts
- Polyamide (PA6, PA66) engineering plastic compounds
- Wire and cable insulation with low smoke and halogen-free requirements
- Silicone rubber compounds for high-temperature and electrical applications
- Synergistic additive in IFR systems to enhance char cohesion and strength
Key Features
- Condensed-phase ceramic char formation mechanism provides flame retardancy without toxic gas generation
- Significant reduction in heat release rate (HRR) and total smoke release improves fire safety profile
- Excellent compatibility with engineering plastics preserves impact strength and electrical properties
- Halogen-free and phosphorus-free, meeting stringent environmental and health safety regulations
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