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QSIL550 (2 KG)
QSIL550 2 KG
QSil™ 550 – Flame Retardant, Thermally Conductive, Two-Part Addition-Cure Silicone for High-Temperature Potting
QSil™ 550 is a two-component, 100% solids, addition cure silicone elastomer engineered for high reliability potting and encapsulation of electronic assemblies that require flame resistance, thermal stability, and environmental protection. With a 1:1 mix ratio by weight, QSil 550 offers a long pot life (130 minutes at 25°C) and cures rapidly to a durable, repairable elastomer either at elevated temperatures (e.g., 7 minutes at 150°C) or at room temperature over a longer cycle.
Formulated as a low-modulus, grey cured system, QSil 550 delivers excellent stress relief for sensitive components while maintaining high thermal conductivity (~0.37 W/mK) and continuous service up to 275°C (527°F). Its UL 94 V-0 rating and high dielectric strength make it ideal for demanding applications such as medical sterilisation units, power electronics, and industrial control systems.
Key Features
- UL 94 V-0 flame retardant (File No. E205830)
- High thermal conductivity: ~0.37 W/mK
- Wide service temperature range: –55°C to 275°C (–67°F to 527°F)
- Low modulus & high elongation (150%) – minimises stress on delicate components
- Addition-cure chemistry – no by-products, non-corrosive, and fully repairable
- Long working life (130 min at 25°C) – ideal for complex potting operations
- Excellent electrical insulation:
- Dielectric strength: 20.3 kV/mm (516 V/mil)
- Volume resistivity: 1.47 × 10¹⁵ ohm·cm
Typical Applications
- Potting of power modules, transformers, and sensors in high-temperature environments
- Encapsulation of electronics in medical sterilisation and industrial heating equipment
- Protection of PCBs in aerospace, automotive, and energy systems requiring flame resistance
- Repairable encapsulation where future rework or component replacement is anticipated
Technical Notes
- Mix ratio: 1:1 by weight (Parts A and B)
- Viscosity (mixed): ~4,000 cP – easy to pour and degas
- Shore A hardness: 55
- Tensile strength: 3.52 N/mm² (510 psi)
- Tear resistance: 5.73 N/mm (33 ppi)
- Self-bonding: No adhesion to substrates may require surface treatment or priming
Cure options:
- Fast cure: 7 minutes at 150°C
- Room-temperature cure: Slower, but viable for non-urgent applications
Storage & Shelf Life
- Shelf life: 24 months in original, unopened containers
- Max storage temperature: 38°C (100°F)
- Store in a cool, dry place away from direct sunlight
Packaging Options
- Available in various bulk packaging configurations.
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QSil™ 550 – Flame Retardant, Thermally Conductive, Two-Part Addition-Cure Silicone for High-Temperature Potting
QSil™ 550 is a two-component, 100% solids, addition cure silicone elastomer engineered for high reliability potting and encapsulation of electronic assemblies that require flame resistance, thermal stability, and environmental protection. With a 1:1 mix ratio by weight, QSil 550 offers a long pot life (130 minutes at 25°C) and cures rapidly to a durable, repairable elastomer either at elevated temperatures (e.g., 7 minutes at 150°C) or at room temperature over a longer cycle.
Formulated as a low-modulus, grey cured system, QSil 550 delivers excellent stress relief for sensitive components while maintaining high thermal conductivity (~0.37 W/mK) and continuous service up to 275°C (527°F). Its UL 94 V-0 rating and high dielectric strength make it ideal for demanding applications such as medical sterilisation units, power electronics, and industrial control systems.