®
SIL-PAD 400
The Original Fiberglass Based Sil-Pad
SIL-PAD 400
Sil-Pad 400 is the original Sil-Pad material. Sil-Pad 400
is a composite of silicone rubber and fiberglass. It is flame
retardant and is specially formulated for use as a thermally
conductive insulator. Primary use is to electrically isolate
power sources from heat sinks.
Sil-Pad 400 has excellent mechanical and physical
characteristics. Surfaces are pliable and allow complete
surface contact with excellent heat dissipation. Sil-Pad 400
actually improves its thermal resistance with age. The
reinforcing fiberglass gives excellent cut-through resistance
and Sil-Pad 400 is non-toxic and resists damage from
cleaning agents.
SIL-PAD 600
Special Thicknesses, Rolls and Sheets
Sil-Pad 600 is a silicone elastomer filled with special
ingredients to provide higher thermal performance. This
material has similar physical characteristics of the Sil-Pad
400 material with enhanced thermal performance.
Sil-Pad 400 can be supplied on special order in a variety
of thicknesses from .007 to .045 inches to fulfill special
requirements of insulation path minimums or other spacing
needs. Sil-Pad 400 and 600 are available in die-cut parts,
sheets (6" x 6" min., 6" x 12", 8" x 8", 10" x 10" and 12" x
12") and roll form.
Physical Properties
Sil-Pad 400, .007 in.
Sil-Pad 400, .009 in
Sil-Pad 600
Test Method
Color
Gray
Gray
Green
Thickness Inches
(mm)
Breaking Strength Lbs/inch (kN/m)
.007 .001"
0.178 0.025
100 (18)
.009 .001"
.229 .025
100 (18)
.009 .001"
.229 .025
100 (18)
ASTM D 374
ASTM D 1458
Elongation, % 45° to warp and fill
Hardness, Shore A
40
85
40
85
40
85
ASTM D 412
ASTM D 2240
Tensile Strength, kPsi (MPa)
45° to warp and fill
Continuous Use Temp., °C
Specific Gravity
3 (20)
-60 to +180
2.0
3 (20)
-60 to +180
1.8
ASTM D 412
ASTM D 792
-60 to +180
2.0
Construction
Silicone/Fiberglass
Silicone/ Fiberglass
Thermal Vacuum Weight Loss
% (TML) as manufactured
Post Cure 24 Hrs. 400 °F
.40
.25
.40
.25
NASA
SP-R-0022A
Volatile Condensable Material
% (CVCM) as manufactured
Post Cure 24 Hrs. 400°F
.11
.07
.11
.07
NASA
SP-R-0022A
Thermal Properties
Thermal Resistance, °C-in /W
Thermal Conductivity, W/m-K
Sil-Pad 400, .007 in.
0.45
0.9
Sil-Pad 400, .009 in
0.50
0.9
Sil-Pad 600
0.35
1.0
Test Method
ASTM D 5470
ASTM D 5470
2
Electrical Properties
Sil-Pad 400, .007 in.
Sil-Pad 400, .009 in
Sil-Pad 600
4500
Test Method
ASTM D 149
ASTM D 150
ASTM D 257
Breakdown Voltage, Volts a-c Min.
Dielectric Constant, 1000 Cps (Hz)
Volume Resistivity, Ohm Metre
3500
5.5
4500
5.5
5.0
11
11
11
1.0 x 10
1.0 x 10
1.0 x 10
14
