Silicone Foam
BISCO® HT‑840 Extra Firm Silicone Foam
Overview
BISCO® HT‑840 is a very firm, closed-cell silicone foam engineered to provide superior sealing capabilities and enhanced durability. It offers higher tear and tensile strength compared to lighter grade foams, making it ideal for applications requiring a durable, high closure force gasket. HT‑840 is also suitable for use in press pads requiring greater conformability and even pressure distribution at high temperatures.
Features
- Density: Approximately 28 lb/ft³ (448 kg/m³)
- Compression Force Deflection (25%): 16–26 psi (110–179 kPa)
- Compression Set: Less than 1% at 70 °C (158 °F)
- Flammability Rating: UL 94 V‑0
- Service Temperature Range: –55 °C to +200 °C (–67 °F to +392 °F)
- Resistance: Excellent resistance to UV, ozone, extreme temperatures, and flame
- Thickness Range: Available from 0.063″ to 0.250″ (1.6 mm to 6.4 mm)
- Color: Typically gray
Benefits
- Enhanced Durability: Higher tear and tensile strength compared to lighter grade foams
- Superior Sealing Performance: Provides reliable sealing in demanding environments
- High Closure Force: Suitable for applications requiring a durable, high closure force gasket
- Conformability at High Temperatures: Ideal for use in press pads requiring greater conformability and even pressure distribution at high temperatures
- Flame Resistance: Meets stringent UL 94 V‑0 flame standards
Applications
- Outdoor Communication Enclosures: Sealing and protecting electronic enclosures from dust particles, wind-driven rain, and fire
- Lighting Fixtures: Gasketing and sealing for lighting applications exposed to harsh conditions
- Transportation Vehicles: Sealing applications in vehicles requiring high durability
- Press Pads: Providing conformability and even pressure distribution at high temperatures
Why Choose BISCO® HT‑840?
- Superior Sealing Capabilities: Offers enhanced durability and sealing performance
- High Closure Force: Designed for use in enclosures requiring a more durable, high closure force gasket
- Versatility: Suitable for a wide range of applications, including sealing, gasketing, shock absorption, and vibration management
- Consistent Performance: Provides consistent performance in all environments, reducing maintenance costs associated with gasket failures
Data Sheets
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