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EPUSIL RTV 227
Low Viscosity, Low Cost, RTV Silicone
Potting/casting Compound
DESCRIPTION
Epusil RTV 227 is a
low viscosity, low cost, flame retardant, general
purpose, reversion resistant RTV silicone. The equal
ratio makes Epusil RTV 227 ideal for automatic
dispensers. With the ability to cure rapidly at
elevated temperature, Epusil RTV 227 combines the
virtues of low temperature flexibility, excellent
electrical properties, high temperature resistance
and component repair.
PROPERTIES – UNCURED
Part A
Part B
Color, visual............................……....
Black White
Viscosity ,
ASTM-D-1084 cps.)..……. 3000 -
4500 3000 - 3500
Specific Gravity (gr/cm3
@ 250)………
1.47 1.47
Mix Ratio (weight or
volume).....…….. 1:1
Mix Viscosity,
ASTM-D-1084…..……
3800 – 4500 cps
Pot Life @ 25 0C
(hours)….………….. 2
to 3 hours
Shelf Life @ 25 0C
…………………… 6 months
min.
PROPERTIES – CURED
Physical
Hardness, ASTM-D-2240 (Durometer)………..
Shore A 40+/- 5
Tensile Strength, ASTM
D-412……………….. 35 +/-2 kg/cm2.
Tensile Elongation, ASTM
D-412…………….. 135%+/-5
Tear Strength, ASTM-D-624 (Die B
kg/cm.)… 3.5 - 4
Coefficient of
Thermal Expansion (cm/cm/0C)....
22 * 10-5
Service
Temperature…………………………… -550C
to 2000C
Electrical
Dielectric Strength, ASTM D-149 (Kv/mm)….
16
Dielectric Constant,
ASTM -D- 150 (60 Hz)…. 3.4
Dissipation Factor,
ASTM -D- 150 (60 Hz)…. 0.004
Volume Resistivity,
ASTM -D- 257 (ohm-cm). 1.0 *
1015
Thermal Conductivity
(W/ m0C)…………..… 0.36
MIXING INSTRUCTION
1.
Pre-mix Epusil RTV 227 Part A and Part B in original
containers before withdrawing any material. Some
light, but soft, settling will occur which readily
predisposes.
2.
Measure equal proportions either weight or volume of
Part A and Part B.
3.
Mix thoroughly, scraping both the bottom and sides
of the mixing container.
4.
Evacuate mixture @ 29 in Hg for 3-4 minutes for
void-free castings.
5.
Pour into unit or mold.
CURE SCHDULE
Overnight at room temperature (12-16 hours) @ 25
0C. or
a. 4 hours @60 0C,
b. 1 hour @90 0C,
c. 15 minutes @125 0C
NOTES
Certain materials may inhibit the cure of Epusil RTV
227 when placed in contact with the 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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