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In the past few decades, extensive studies have been conducted by various researchers on the effects of hydrostatic pressure on monolithic materials. Recent efforts have been focused on the behavior of composite materials in hydrostatic pressure environments. In the current study, room temperature hydrostatic extrusion was performed on overaged X2080/SiC/20p having average selected particle diameters in the 4 to 37 μm range. Hydrostatic extrusion pressures were particle size dependent, with smaller particle sizes requiring larger pressures for extrusion. The observed particle size trend was in agreement with previous mechanical models of hydrostatic extrusion.