TekNational, Inc.
Tek-Sil® GP9X Series
If you need a gap filler with higher thermal conductivity and low thermal resistance, Tek-Sil® GP9X is rated at a higher 13 watt/mk compared to 1.5 watt/mk for the standard "GP" material.  This material is presently available in five thicknesses. 
GP9X SeriesUnitGP9X-40GP9X-60GP9X-79GP9X-98GP9X-118
Thicknessmm1.0 +/-0.151.5 +/-0.22.0 +/-0.32.5 +/-0.33.0 +/-0.3
Widthmm200200200200200
Lengthmm300300300300300
Thermal Resistance°Cin²/W1.12.33.7
ColorvisualLight Gray
Thermal Conductivitywatt/m-k13
Volume ResistivityMohm·m1.0x1011
Withstand VoltagekV/mm·AC15
Specific Gravitygr/cm³3.3
HardnessShore OO75
Elongation%50
CompressionN/cm²@10%826049
50% sustain after 1 min389319286
Continuous Use°C-40° to +150°
Flame RetardanceUL 94VV-0