8329TCS is a thermally conductive two-part epoxy adhesive with a long working life. It is dark grey, smooth, viscous, thixotropic, and bonds well to a wide variety of substrates. This product is used to bond heat sinks, LEDs, and other heat-generating components in electronic assemblies. 8329TCS has been designed for maximum thermal conductivity with a high viscosity. For a lower viscosity, use 8329TFS. For a shorter working life, use 8329TCF or 8329TCM.