IMTH30 series thermal pads have a high conductivity of 3.0 W/m*K and is available in 0.3 mm to 10 mm thicknesses.
Silicone-based thermal pads are becoming an industry standard for thermal management solutions for their durability to withstand high temperatures up to 200°C. Intermark-USA offers a wide variety from 1.0 W/m*K up to 7.0 W/m*K. While some may be concerned with the use of silicone, outgas levels are extremely low. They come with the options of two sides self-tacky and one side self-tacky. Thickness are flexible ranging from 0.5mm and up.