TekNational, Inc.
Tek-Sil® GP6X Series
If you need a gap filler with higher thermal conductivity, Tek-Sil® GP6X is rated at 14 watt/mk compared to 1.5 watt/mk for the standard "GP" material.  This material is presently available in five thicknesses. 
GP6X SeriesUnitGP6X-15GP6X-20GP6X-40GP6X-60GP6X-79
Thicknessmm0.300.501.0 +/-0.21.5 +/-0.22.0 +/-0.3
Widthmm180200200200200
Lengthmm280300300300300
Thermal Resistance°Cin²/W0.10.120.190.290.35
ColorvisualLight Gray
Thermal Conductivitywatt/m-k14
Volume ResistivityMohm·m7x10³
Withstand VoltagekV/mm·AC11
Specific Gravitygr/cm³3.2
HardnessShore OO64
Elongation%40
CompressionKgf/in²@10%45124103123129
50% sustain after 1 min137204187181172
Continuous Use°C-60° to +200°
Flame RetardanceUL 94VV-0