GRAPHITE FOILS
- Thermal conductivities up to 1,950 W/mK in-plane and 25 W/mK in through z-direction
- Heat spreading from hot spots
- Low thermal contact resistance through good surface compliance
- Very low weight
- Silicone-free
- Extreme temperature range up to 400°C
- No dry-up, migrating, run out or pump out
- EMI-shielding through high electrical conductivity as side effect
- 180°C foldable (pyrolytic graphite)
FAQ
Graphite foils consist of more than 98% pure natural or synthetic pyrolytic graphite. Due to their flake-like crystal structure, they conduct heat laterally in the x-y plane at up to 1,950 W/mK — nearly five times better than copper — while spreading heat away from hot spots across a large area. In the z-direction (through the foil), conductivity is around 25 W/mK, making them highly anisotropic thermal interface materials.
Natural graphite foils are produced from graphite minerals and achieve in-plane thermal conductivities up to approximately 700 W/mK. Pyrolytic graphite foils are synthetically manufactured and reach up to 1,950 W/mK — while remaining flexible and foldable up to 180° without breaking. Both are silicone-free and temperature resistant up to 400°C.
No — graphite foils are electrically conductive, which gives them a useful side effect of EMI shielding through high electrical conductivity. For applications requiring electrical isolation, graphite foils are available with laminated dielectric films (PEEK, PI, PET). Alternatively, electrically insulating silicone foils or electrical insulating films are the right choice.
Graphite foils are used wherever hot spots need to be spread laterally and heat transported away from compact components: power modules with MOSFETs and IGBTs, inverters, e-mobility battery systems, smartphones, laptops and high-performance servers. Their low weight compared to copper or aluminium makes them ideal for weight-sensitive applications.
Yes. HALA supplies graphite foils as sheets, rolls and custom die-cut parts — with or without adhesive, with or without laminated dielectric films (PEEK, PI, PET), and with two-side phase change coating for optimised bondline performance. Request a free sample or expert consultation.
