btechcorp has invented and patented a process for aligning high density fibers through the thickness of a polymer matrix… up to 20 million fibers per square inch.

Unique highly thermally conductive graphite fibers (1900 W/m°K) are used to create a Z-axis bulk thermal conductivity of 750 W/m°K (at 40% fiber volume)…twice the thermal conductivity of pure copper.

HM-2 Thermally Conductive Adhesive Film is currently being used or evaluated for a variety of Thermal Interface Material applications, including die attach, , LED assembly, heat pipe attachment, heat sink attachment and production dice thermal test equipment. An on-going product improvement program (see PowerPoint presentation) has already demonstrated lower total thermal resistance and this will be incorporated into our production process in the near future. A combination of lower interface resistance and higher bulk conductivity will be needed to reach our HM-2 performance Goal.

HM-2 Application Bonding: See Thermoplastic Film Bonding Page, Section A. All instructions for NTP/TP-3 also apply to HM-2 since they all use the same thermoplastic resin.

HM-2 Properties

Z-Axis Thermal Resistance 0.06 ⁰C-cm²/W (100µ thick bond)
Z-Axis Electrical Resistance 0.1-0.2 ohms (1.0 cm², 100µ thick)
Coefficient of Thermal Expansion Z-Axis: 0 ppm/⁰C, X-Y plane: 45 ppm/⁰C
Young’s Modulus X-Axis: 75 Ksi (0.45 GPa)
Y-Axis: 15 Ksi (0.09 GPa)
Ionic Purity Hydrolyzable Chloride <5 ppm
Hydrolyzable Sodium <2ppm
Rework Temperature 205 ⁰C


Product Form Film pre-form for reel supply. 2-10 mils (0.05-0.25mm) thick, +/- 0.1 mil
Cure Cycle 100 psi bond compression (<3 sec) at 190 ⁰C (resin temperature)
Storage Life 6 months at 27 ⁰C (80 ⁰F)