BISCO HT-840

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.

Data Sheet

Thickness

Features

Benefits

Applications

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BISCO HT-840 Data Sheet

PROPERTY	TEST METHOD	TYPICAL VALUE*
Color	Visual	Gray
Thickness, mm (inches)	Internal	1.59 - 6.35 (0.063 - 0.250)
Density, kg/m³ (lb./ft³)	Internal	448 (28)
Compression Force Deflection, kPa (psi)	ASTM D1056	142 (20.6)
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	0.5
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	Pass
Low Temperature Brittleness	ASTM D746 -55°C (-67°F) / 3 min	Pass

BISCO HT-840 Thickness

NOMINAL THICKNESS	TOLERANCE
mm (inches)	mm (inches)
1.59 (0.063)	± 0.508 (± 0.020)
2.39 (0.094)	± 0.508 (± 0.020)
3.18 (0.125)	± 0.635 (± 0.025)
4.78 (0.188)	± 0.635 (± 0.025)
6.35 (0.250)	± 0.762 (± 0.030)

BISCO HT-840 Features

Compact cell structure
Available in thicknesses from 0.063 to 0.250 in.
The typical density of 28 PCF
CFD range of 16-26 PSI
Resistant to UV, ozone, extreme temperatures, and flame

BISCO HT-840 Benefits

Provides enhanced durability and sealing performance
Offers consistent performance in all environments
Reduces maintenance costs associated with gasket failures due to compression set and softening