TekNational, Inc.
Tek-Sil® GP1X Series
If you need a gap filler with higher thermal conductivity, Tek-Sil® GP1X is rated at 1.3 watt/mk compared to 1.5 watt/mk for the standard "GP" material.  This material is presently available in nine thicknesses. 
GP1X SeriesUnitGP1X-20GP1X-40GP1X-60GP1X-79GP1X-98GP1X-118GP1X-138GP1X-177GP1X-197
Thicknessmm0.5 +/-0.11.0 +/-0.21.5 +/-0.22.0 +/-0.32.5 +/-0.33.0 +/-0.33.5 +/-0.34.0 +/-0.35.0 +/-0.3
Widthmm200200200200200200200200200
Lengthmm300300300300300300300300300
Thermal Resistance°Cin²/W0.630.941.201.511.921.932.132.462.76
ColorvisualApricot
Thermal Conductivitywatt/m-k1.3
Volume ResistivityMohm·m1x106
Withstand VoltagekV/mm·AC12
Specific Gravitygr/cm³2.0
HardnessShore OO24
Elongation%300
CompressionKgf/in²@10%11813372361712
50% sustain after 1 min896352271312
Continuous Use°C-60° to +200°
Flame RetardanceUL 94VV-0