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
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.
Special Thicknesses, Rolls and Sheets
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.
SIL-PAD 400
®
The Original Fiberglass Based Sil-Pad
Physical Properties Sil-Pad 400, .007 in. Sil-Pad 400, .009 in Sil-Pad 600 Test Method
Color Gray Gray Green
Thickness Inches .007 ± .001" .009 ± .001" .009 ± .001"
(mm) 0.178 ±0.025 .229 ± .025 .229 ± .025 ASTM D 374
Breaking Strength Lbs/inch (kN/m) 100 (18) 100 (18) 100 (18) ASTM D 1458
Elongation, % 45° to warp and fill 40 40 40 ASTM D 412
Hardness, Shore A 85 85 85 ASTM D 2240
Tensile Strength, kPsi (MPa)
45° to warp and fill 3 (20) 3 (20) ASTM D 412
Continuous Use Temp., °C -60 to +180 -60 to +180 -60 to +180
Specific Gravity 2.0 2.0 1.8 ASTM D 792
Construction Silicone/Fiberglass Silicone/ Fiberglass
Thermal Vacuum Weight Loss
% (TML) as manufactured .40 .40 NASA
Post Cure 24 Hrs. 400 °F .25 .25 SP-R-0022A
Volatile Condensable Material
% (CVCM) as manufactured .11 .11 NASA
Post Cure 24 Hrs. 400°F .07 .07 SP-R-0022A
Thermal Properties Sil-Pad 400, .007 in. Sil-Pad 400, .009 in Sil-Pad 600 Test Method
Thermal Resistance, °C-in
2
/W 0.45 0.50 0.35 ASTM D 5470
Thermal Conductivity, W/m-K 0.9 0.9 1.0 ASTM D 5470
Electrical Properties Sil-Pad 400, .007 in. Sil-Pad 400, .009 in Sil-Pad 600 Test Method
Breakdown Voltage, Volts a-c Min. 3500 4500 4500 ASTM D 149
Dielectric Constant, 1000 Cps (Hz) 5.5 5.5 5.0 ASTM D 150
Volume Resistivity, Ohm Metre 1.0 x 10
11
1.0 x 10
11
1.0 x 10
11
ASTM D 257
25
