Cured Silicone withstands temperatures to 400°F.

With 2.2 Btu-in./hr/ft²/°F thermal conductivity, Master Sil 150 is 2-part, condensation cured liquid silicone system which can be used for potting and encapsulation. It has Shore A hardness of 40, 230% elongation at break, 11 x 10^-4 cm/cm°C thermal expansion, and less than 0.4% linear shrinkage. Able to protect sensitive electronic components/assemblies from dust, moisture, ozone, thermal shock, and vibration, silicone cures in contact with virtually all types of materials.