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EPUSIL RTV 146
Low Density, Parable
RTV Silicone Syntactic Foam
DESCRIPTION
Epusil RTV 146 is an
easily poured, room temperature curing, silicone
rubber compound, which cures to a flexible, low
density silicone foam. It is”syntactic” foam, thus
the cells are not interconnected. It finds use where
low density (weigh) is important such as in air
borne or “man-pack” equipment. It’s extremely low
dielectric constant and dissipation factor suggest
its use in circuitry where low capacitance is
necessary. Epusil RTV 146 does not change volume
during cure
PROPERTIES – UNCURED
Color,
visual............................……....
White
Viscosity ,
ASTM-D-1084 ……….….. 40000 cps
Specific Gravity
…………..........……. 0.70 gr./cm3
Mix Ratio (RTV Cat 12)............……..
0.1- 0.5 by weight
Mix
Viscosity…………………….…… 40000 cps.
Pot Life @ 250
C …………………….. 1 to 4
hours
Shelf Life @ 250 C
…………………… 6 months min.
PROPERTIES – CURED
Physical
Hardness,
ASTM-D-2240 (Durometer)………..
Shore A 50
Tensile Strength, ASTM
D-412……………….. 43 - 47 kg/cm2
Tensile Elongation, ASTM
D-412…………….. 120%
Tear Strength, ASTM-D-624 (Die B.)
…….…. 6 – 8 kg/cm
Coefficient of
Thermal Expansion (cm/cm/0C).
15 * 10-5
Service
Temperature…………………………… -550C
to 2040C
Shrinkage
……………………………………… 0.1% to 0.3%
Electrical
Dielectric Strength, ASTM D-149
(volts/mil)…
250 to 300
Dielectric Constant,
ASTM -D- 150 (60 Hz)…. 2.2
Dissipation Factor,
ASTM -D- 150 (60 Hz)…. 0.0045
Volume Resistivity,
ASTM -D- 257 (ohm-cm). 1014
Thermal Conductivity
( W/m 0C)……………...
0.15
MIXING INSTRUCTION
1.
Weigh out the required amount of Epusil RTV 146.
2.
Measure the required amount of catalyst.
3.
Mix thoroughly, scraping both the bottom and sides
of the mixing container.
4.
Evacuate mixture @ 29 in Hg for 3-4 minutes to
insure a void-free casting.
5.
Pour into unit, cavity or mold.
CURE SCHDULE
Overnight at room temperature (12-16 hours) @ 25
0C. Faster tack-free surfaces achieved
using varied catalysts.
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