Heat Dissipation Materials
The Hermetic Solutions Group has 100+ years of combined experience in metallurgy and the manufacture of metals and metal alloys.
To consistently meet evolving customer requirements and heat dissipation challenges, we use technically robust advanced thermal management materials. Additionally, we seek innovative new materials to help you be one step ahead of these challenges. The reference table shows the most common thermal management materials and we can help you identify the best thermal management solution for your specific application.
We’re happy to assist in your design process and material selection - don’t hesitate to call us.

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Specifications
Heatspreader | Category | Material | Composition | Coefficient of Thermal Expansion (ppm / K) | Thermal Conductivity (W/(m*K)) | Density | |
Room Temperature | 100oC | ||||||
Metals | W | 100% W | 4.5 | 167 | 159 | 19.3 | |
Mo | 100% Mo | 5.1 | 159 | 138 | 10.2 | ||
Cu | 100% Cu | 16.5 | 400 | – | 8.96 | ||
Metals, Composites, Alloys | Cu-W | 90% W / 10% Cu | 6.5 | 180 | 176 | 17 | |
80% W / 20% Cu | 8.3 | 200 | 197 | 15.65 | |||
75% W / 25% Cu | 9.0 | 220 | 230 | 14.9 | |||
Cu – Mo | 85% Mo / 15% Cu | 7.0 | 160 | 156 | 10.01 | ||
70% Mo / 30% Cu | 7.1 | 200 | 196 | 9.8 | |||
65% Mo / 35% Cu | 9.4 | 210 | 205 | 9.7 | |||
Metal Laminates | Cu-Mo-Cu | 13% Cu / 74% Mo / 13% Cu | 5.6 | 208 | – | 9.88 | |
20% Cu / 60% Mo / 20% Cu | 6.8 | 242 | – | 9.66 | |||
Ceramics | AlN | SALN-20 White | 4.5 | >200 | >180 | 3.26 | |
Ceramics – Metal | Al-Si | 60% Si / 40% Al | 9.1 | 129 | – | 2.46 | |
Al-SiC | 70% SiC / 30% Al | 8 | 140 | – | 2.6 | ||
Si-Sic | 18% Si-SiC | 3 | >200 | – | 3 | ||
Diamond | CVD-Diamond | 2.3 | >1000 | – | 3.52 | ||
Reference Data | Semiconductor | Si | 3 | 151 | – | 2.3 | |
GaAs | 5.9 | 46 | 34 | 5.32 | |||
InP | 4.5 | 70 | – | 4.79 | |||
GaN | A5.6-c3.2 | 130 | – | 6.15 | |||
SiC | 3.1 | 490 | – | 3.2 | |||
Ceramics | Al2O2 | 6.7 | 17 | 17 | 3.6 | ||
BeO | 7.6 | 251 | 180 | 2.9 | |||
Metals | Cu | 17 | 393 | 393 | 8.93 | ||
Al | 23 | 238 | – | 2.7 | |||
Kovar | 5.3 | 17 | 17 | 8.36 | |||
Organic | FR-4 | X15-y17 | 0.2 | – | – | ||
Polyimide | 25 | 0.2 | – | – |