Extra Firm Cellular Silicone
IOTA-HT-840
IOTA-HT-840
is an extra-firm grade silicone foam that offers improved durability and
sealing. It is used to seal and protect various outdoor communication,
lighting, and electronic enclosures from small dust particles, wind driven
rain, and fire. It offers a higher tear and tensile strength than our lighter grade
foams. IOTA Silicones are available in various
thicknesses
and manufactured in roll form to allow fabricators to easily convert the
material to the proper dimensions.
Features and Benefits
Good memory and
low stress relaxation reduces maintenance costs associated with gasket failures
due to compression set and softening.
Resistance to
ultraviolet light, ozone,
extreme temperatures, and flame enables consistent performance in all
environments.
Compact cell structure
provides improved sealing performance.
Available through distribution
sites throughout North America, Europe, and Asia.
Applications
Environmental seals to
protect against penetration of dust, moisture, air, or light within outdoor
enclosures such as lighting fixtures, HVAC units, and electronic cabinets.
Enclosures requiring a
more durable, high closure force gasket.
Press pads requiring
greater conformability and even pressure distribution at high temperatures.
Installation
Available with a
pressure-sensitive adhesive on one or two sides to allow easy application to a
variety of surfaces.
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IOTA-HT-840
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Property
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Test Method
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Typical Value
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PHYSICAL
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Color
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Gray
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Thickness, mm
(inches)
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0.80 – 3.18 (0.031 – 0.25)
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Standard Width, mm (inches)
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449 (28)
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Density, kg/m3 (lb./ft3)
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ASTM D 1056
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432 (27)
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Compression Force
Deflection, kPa (psi)
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Force measured @
25% Deflection
ASTM D 1056
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151.7
(22)
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Compression Set,
% max.
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ASTM D 1056
Test D @ 70℃
(158℉)
ASTM D 1056
Test D @ 100℃
(212℉)
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< 1
< 5
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Tensile Strength, kPa (psi)
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ASTM D 412
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414 (60)
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Elongation, %
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ASTM D 412
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55
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FLAMMABILITY & OUTGASSING
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Flame Resistance
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UL 94
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Listed V-0 and HF-1
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Flame Spread Index (Ls)
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ASTM E 162
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< 25
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Smoke Density (Ds )
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ASTM E 662
Tested @ 4.0 minutes
Tested @ 1.5 minutes
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< 50
< 20
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Toxic Gas Emissions
Rating
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SMP-800C
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Pass
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Environmental
Properties
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Water Absorption
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Internal: 24 hrs @ room
temp.
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0.20 %
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UV Resistance
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SAE J - 1960
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No Degradation
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Ozone Effect Rating
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ASTM D 1171
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0 (No Cracks)
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Corrosion
Resistance
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AMS - 3568
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Pass
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Electrical
& Thermal Properties
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Dielectric Constant
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ASTM D 150
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1.58
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Dielectric Strength
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ASTM D 149, Volts/mil
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95
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Dry Arc Resistance
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ASTM D 495, Seconds
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98
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Volume Resistivity, Ohm –
cm
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ASTM D 257
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1014
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Thermal Conductivity,
w/m oK (BTU in/hr/ft2 /℉)
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ASTM C 518
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0.12 (0.84)
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Temperature
Resistance
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Low Temperature Flex at -55℃ (-67℉)
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ASTM D 1056
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Pass
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Recommended Use
Temperature,
℃ (℉)
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Internal
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-55° to 200° (-67° to 392°)
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