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Thermalsil™ III
RoHS Compliant
Thermally Conductive Silicone Rubber Insulators

The newest Thermalsil™ III formula has improved thermal conductivity, providing excellent thermal resistance. It is used as an electrically-isolating interface material composed of silicone elastomer binder with a thermally conductive filler. It is reinforced with glass cloth to resist tearing and cut-through due to burrs on transistors or heat sinks.

Thermalsil™ III eliminates the need for grease application and conforms to mounting surfaces under clamping pressure for optimum heat conduction.

Thermalsil™ III is .152mm (0.006") thick and grey green in color. A finely woven glass cloth provides the thinnest possible matrix for enhanced thermal resistance.

To order Thermalsil™ III with adhesive coated backing, add suffix "AC" to the part number. For example, 53-03-2AC.

Thermalsil™ III is available in any configuration with adhesive backing. Order by adding "AC" after the part number. For example: 53-03-2AC.

 Bulk Thermalsil™ III

Thermalsil™ III is also available in three widths, with and without adhesive coated backing (AC). Thermalsil™ III is .152mm (0.006") thick.
Part No.* RoHS PCN Width
5300 1.500G N/A 38.10mm (1.500")
5300AC 1.500G 38.10mm (1.500")
5300 2.875G N/A 76.20mm (3.000")
5300AC 2.875G N/A 76.20mm (3.000")
5300 6.000G N/A 152.40mm (6.000")
5300AC 6.000G N/A 152.40mm (6.000")
*Available in full (328 ft.) length rolls only


Thermalsil™ III

PropertyTypical Value 25°CTest Method
Electrical
Dielectric Constant2.5@50 Hz
2.5@103 Hz
2.5@106 Hz		ASTM D150
Dielectric Breakdown Voltage26.3 x 103 volts/mm (667 volts/mil) ASTM D-149ASTM D149
Volume Resistivity5.7 x 1015 ohm-cmASTM D257
Dielectric Dissipation Factor.008@50 Hz
.004 @103 Hz
.004 @106 Hz		ASTM D150
Physical
Thickness.15 + .03/-.05mm
(0.006 + .001/-.002 in.)
ColorGray-Green
Tensile Strength6.1 x 107 Pa (8786 psil)
Hardness, Shore A87
Elongation2% or less
Thermal
Thermal Conductivity0.92 w/m °C
Flame ResistanceUL 94V-0 UL card #E-58126 (S)
Service Temperature-60°C to 180°C
(-76°F to 356°F)
*Thickness:
4103: 1.78 (0.070) to 2.03 (0.080)
4104: 1.52 (0.060) to 2.03 (0.080)


Standard Thermalsil Configurations



Part Number RoHS PCN A B C D
53-03-2G 42.04 (1.655) 27.00 (1.063) 3.96 (0.156) 1.57 (0.062)
53-03-11G N/A 41.81 (1.646) 28.58 (1.125) 3.96 (0.156) 2.36 (0.093)
53-03-12G N/A 41.91 (1.650) 28.96 (1.140) 3.56 (0.140) 2.36 (0.093)
53-03-14G N/A 39.70 (1.563) 26.67 (1.050) 3.56 (0.140) 2.36 (0.093)
53-03-15G N/A 40.46 (1.593) 27.94 (1.100) 3.96 (0.140) 1.78 (0.070)
53-03-16G N/A 43.18 (1.700) 30.15 (1.187) 3.96 (0.156) 1.60 (0.063)




Part Number A B C D E F G
53-02-95G 23.24 (0.915) 18.80 (0.740) 16.26 (0.640) 6.99 (0.275) 9.40 (0.370) 5.59 (0.220) 3.66 (0.144)
53-02-102G 21.97 (0.865) 16.51 (0.650) 16.51 (0.650) 5.46 (0.215) 8.26 (0.325) 4.06 (0.160) 3.56 (0.140)
53-02-103G** 23.80 (0.937) 19.05 (0.750) 16.66 (0.656) 7.14 (0.281) 9.53 (0.375)
3.18 (0.125)
53-78-3G* ** 25.40 (1.000) 20.32 (0.800)








Part Number RoHS PCN A B C D
53-77-2G 17.50 (0.687) 14.27 (0.562) 5.54 (0.218) 3.18 (0.125)
53-77-3G 17.50 (0.687) 41.27 (0.562) 4.70 (0.185) 2.36 (0.093)
53-77-4G 19.05 (0.750) 12.70 (0.500) 4.75 (0.187) 3.73 (0.147)
53-77-5G N/A 20.32 (0.800) 15.24 (0.600) 5.54 (0.218) 2.79 (0.110)
53-77-9G N/A 18.42 (0.725) 13.21 (0.520) 4.32 (0.170) 2.92 (0.115)
53-77-10G N/A 20.96 (0.825) 22.99 (0.905) 5.33 (0.210) 3.68 (0.145)
53-77-11G N/A 26.16 (1.030) 13.21 (0.520) 3.81 (0.150) 3.30 (0.130)
53-77-13G N/A 18.03 (0.710) 12.70 (0.500) 4.06 (0.160) 3.58 (0.141)
53-78-1G* N/A 22.10 (0.870) 1.57 (0.620)





Part Number A B
53-02-10G 14.27 (0.562) 5.16 (0.203)
53-02-25G 20.62 (0.182) 6.73 (0.266)
* This insulator is made especially for clip-mount heat sinks, thus requiring no mounting hole.
** These insulators may also be used for TO-3P and TO-247 devices.








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