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 Color Thickness Inches (mm) Breaking Strength Lbs/inch (kN/m) Elongation, % 45° to warp and fill Hardness, Shore A Tensile Strength, kPsi (MPa) 45° to warp and fill Continuous Use Temp., °C Specific Gravity Construction Thermal Vacuum Weight Loss % (TML) as manufactured Post Cure 24 Hrs. 400 °F Volatile Condensable Material % (CVCM) as manufactured Post Cure 24 Hrs. 400°F Sil-Pad 400, .007 in. Gray .007 ± .001" 0.178 ±0.025 100 (18) 40 85 Sil-Pad 400, .009 in Gray .009 ± .001" .229 ± .025 100 (18) 40 85 Sil-Pad 600 Green .009 ± .001" .229 ± .025 100 (18) 40 85 Test Method 3 (20) -60 to +180 2.0 Silicone/ Fiberglass 3 (20) -60 to +180 1.8 ASTM D 412 -60 to +180 2.0 Silicone/Fiberglass .40 .25 .40 .25 NASA SP-R-0022A .11 .07 .11 .07 NASA Thermal Properties Thermal Resistance, °C-in2/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 Electrical Properties Breakdown Voltage, Volts a-c Min. Dielectric Constant, 1000 Cps (Hz) Volume Resistivity, Ohm Metre Sil-Pad 400, .007 in. 3500 5.5 1.0 x 1011 Sil-Pad 400, .009 in 4500 5.5 1.0 x 1011 Sil-Pad 600 4500 5.0 1.0 x 1011 Test Method ASTM D 149 ASTM D 150 ASTM D 257 ASTM D 374 ASTM D 1458 ASTM D 412 ASTM D 2240 ASTM D 792 SP-R-0022A 14