ECCOSORB^® MF500F is a series of rigid, magnetically loaded, epoxide rod, bar and sheet materials. This high temperature absorber product line is designed for use at short periods of 500 °F (260 °C) permitting use at high ambients and/or high power levels. Physical and electrical properties are the same as those of the corresponding member of the ECCOSORB^® MF series.

ECCOSORB^® MF500F is widely used as a waveguide absorber, attenuators, and terminations in waveguides and coaxial lines.  It has also been successfully used as a high-Q inductor-core material in such devices as slug tuners.  Simple RF filters can be formed by passing filament leads through small blocks of ECCOSORB^® MF500F, or by casting appropriate sections of the material around such leads by using one of the electrically equivalent castable absorbers.  There are also applications in antenna elements and in certain free space absorbers.