Premium ceramic thermal compound Not for use with thermal pads or phase-change thermal material Made with micronized aluminum oxide and boron nitride. Controlled triple phase viscosity. Absolute Stability; Arctic Alumina will not separate, run, migrate, or bleed. Electrical Insulator. Thermal conductivity: 4.0 W/mK (Hot Wire Method Per MIL-C-47113) Thermal Resistance: 0.010C-in/Watt (0.001 inch layer) Extended temperature limits: 40C to 180C 2 to 10 degrees centigrade lower CPU full load core temperatures than standard thermal compounds or thermal pads.