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EPUSIL RTV 261
Clear, Low Viscosity RTV Silicone
DESCRIPTION
Epusil RTV 261 is a
low viscosity, transparent RTV silicone compound
which cures to a water-clear silicone gel. Epusil
RTV 261 is used in situations where component
identification and vibration shock protection is
needed. Epusil RTV 261 cure may be accelerated by
the use of elevated temperature.
PROPERTIES – UNCURED
Part A
Part B
Color,
visual............................………....
Clear Clear
Viscosity ,
ASTM-D-1084 (cps)….…….
5000+/-200 5500+/- 300
Specific Gravity (gr/cm3
@250)…………
1.0 1.0
Mix Ratio (weight)
………….....………. 10:1
Mixed Viscosity,
ASTM-D-1084………. 5000 +/- 200
cps
Specific Gravity
(mixed)……………….. 1.0
Pot Life @ 25 0C
(hours)….……………. 2 hours
Shelf Life @ 25
0C.
…………………….. 6 months min.
PROPERTIES – CURED
Physical
Hardness,
ASTM-D-2240 (Durometer)………..
Shore A 30+/- 3
Tensile Strength, ASTM
D-412……………….. 60 –64 kg/cm2
Tensile Elongation, ASTM
D-412…………….. 150%+/-5
Tear Strength, ASTM-D-624 (Die B
kg/cm.)… 5 - 6
Coefficient of
Thermal Expansion (cm/cm/0C).
27 * 10-5
Linear Shrinkage………………………………. <
0.2
Service
Temperature…………………………… -550C
to 2000C
Electrical
Dielectric Strength,
ASTM D-149 (volts/mil)… 500
Dielectric Constant,
ASTM -D- 150 (60 Hz)…. 3.0
Dissipation Factor,
ASTM -D- 150 (60 Hz)…. 0.001
Volume Resistivity,
ASTM -D- 257 (ohm-cm).
1.0 * 1015
Thermal Conductivity
(W/ m0C)…………..…
0.18
MIXING INSTRUCTION
1.
Weigh out amount of Epusil RTV 261 Part A.
2.
Measure into Part A, 10 parts of Part B for each 100
parts of Part A .
3.
Mix thoroughly, scraping both sides and bottom of
container.
4.
Pour into cavity or unit. Epusil RTV 261 will de-gas
if left undisturbed for 5 to 10 minutes.
CURE SCHDULE
Overnight at room temperature (12-16 hours) @ 25
0C; two hours at 50 0C;
One hour @ 65 0C.
NOTES
Certain materials may inhibit the cure of Epusil RTV
261 when placed in contact with mixed, uncured
rubber. Materials such as amines and amine-cured
epoxies, sulfur containing materials and
condensation (tin cured) silicones, are some, which
may cause inhibition. Even surfaces, which have been
in contact with such materials, may cause it. If in
doubt, a patch test should be done.
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