Rogers BISCO HT-840 Extra Firm Cellular Silicone provides enhanced durability with the excellent sealing properties of sponge rubber.
BISCO HT-840 Extra Firm Cellular Silicone is a very firm-grade silicone foam that offers superior sealing capabilities.
HT-840 silicone provides a higher tear and tensile strength than our lighter-grade foams.
HT-840 silicone is designed for use in enclosures requiring a more durable, high-closure force gasket. This material is also ideal for use in press pads requiring greater conformability and even pressure distribution at high temperatures.
HT-840 silicone is a great choice for sealing and protecting outdoor communication, lighting, and electronic enclosures from small dust particles, wind-driven rain, and fire.
|PROPERTY||TEST METHOD||TYPICAL VALUE*|
|Thickness, mm (inches)||Internal||1.59 - 6.35
(0.063 - 0.250)
|Density, kg/m³ (lb./ft³)||Internal||448
|Compression Force Deflection, kPa (psi)||ASTM D1056||142
|Compression Set, %||ASTM D1056 100°C (212°F) / 22 hrs / 50%||1.8|
|Water Absorption, %||Internal|
2" below water surface / 24 hrs /
change in weight
|Temperature Range, °C (°F)||Internal||-55 to +200
(-67 to +392)
|Thermal Conductivity, W/m °K||ASTM D518||0.09|
|Low Temperature Flex||ASTM D1056|
-55°C (-67°F) / 5 hrs
|Low Temperature Brittleness||ASTM D746|
-55°C (-67°F) / 3 min
|mm (inches)||mm (inches)|
| ± 0.508
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