The shock‐wave equation of state for a commerically available alumina‐filled epoxy has been determined in the stress range from 0.4 to 3.7 GPa via gas‐gun‐impact experiments. A linear fit to the shock‐velocity–particle‐velocity data yieldsU=2.78+1.63u. This curve lies between theU‐ucurves for an unfilled epoxy and for an alumina‐filled epoxy of higher density.