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High-efficiency halogen-free flame retardancy meeting UL 94 V-0 and V-1 standards in silicone elastomer systems.
Excellent thermal stability up to 250 °C, maintaining flame-retardant performance during high-temperature processing and end-use.
Superior compatibility with addition-cure and condensation-cure silicone polymers without compromising mechanical properties.
Low volatility and minimal migration, ensuring long-term flame-retardant efficacy and surface integrity.
Non-corrosive formulation compatible with platinum catalysts and sensitive electronic components.
Flame-retardant silicone encapsulants for LED lighting modules and power electronics.
Fire-safe gaskets and seals in electric vehicle battery packs and charging infrastructure.
UL-rated silicone potting compounds for industrial control units and renewable energy inverters.
Self-extinguishing silicone coatings for wire & cable jacketing in building wiring and rail transport.
FR-modified liquid silicone rubber (LSR) for medical device housings requiring fire safety compliance.
| Chemical Type | Organosilicon-based halogen-free flame retardant |
| Product Form | Free-flowing white powder |
| Appearance | White to off-white fine particulate |
| Density (25 °C) | 1.8–2.0 g/cm³ |
| Moisture Content (max) | 0.5 wt% |
| pH (1% aqueous dispersion) | 6.0–7.5 |
| Primary Applications | Flame-retardant LSR, HTV silicone, and silicone gel formulations |
| Key Features | Halogen-free, RoHS-compliant, non-migrating, thermally stable |
Q1: What is the primary mechanism by which KR-480 imparts flame retardancy?
A: KR-480 functions primarily through a condensed-phase mechanism—forming a protective, thermally stable silica-rich char layer upon exposure to heat or flame, which insulates the underlying polymer and suppresses smoke and volatile decomposition products.
Q2: Is KR-480 compatible with common silicone elastomers and high-temperature vulcanizing (HTV) systems?
A: Yes, KR-480 is specifically designed for compatibility with methylvinyl silicone polymers and exhibits excellent dispersion in both HTV and liquid silicone rubber (LSR) formulations without significantly compromising cure kinetics or mechanical properties.
Q3: How does KR-480 compare to conventional halogen-free flame retardants in terms of smoke suppression?
A: Compared to many non-halogenated mineral fillers, KR-480 delivers superior smoke suppression due to its silicone-based char-forming behavior, resulting in lower smoke density and reduced toxic gas evolution during combustion.
Q4: What is the typical dosage range for effective flame retardancy in silicone compounds?
A: Effective performance is typically achieved at low concentrations—generally ranging from 0.1% to 2% by weight—depending on the base polymer system, required fire rating, and presence of synergistic additives.
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