Room temperature curing epoxy resin is cured with amine. Thermal conductive and self-extinguishing (UL94 V0) casting resins are available for the filled epoxy resin. Filled epoxy resins are preferred over unfilled for larger casting volumes, since there is a lower heat of reaction with the filling materials. Likewise, smaller heat expansion coefficients are achieved with the filled epoxy resin.
The advantage of unfilled epoxy resin is essentially the improved fluidity and the simplicity of handling. Filled casting resins must be stirred before handling and possibly heated up to achieve the necessary flow characteristics, but this does not apply for unfilled epoxy resin.
Depending on the required casting demands, resins with the following properties are available: