The elevated temperature (2000F) short time tensile strength of cobalt was increased from 2,700 psi to 23,700 psi by reinforcing the cobalt with 18 vol. percent of 5 mil continuous tungsten wires. This strengthening by 5 mil wires was equivalent to 89 percent of theoretical strengthening and was comparable to that attained by using the same quantity of 10 mil tungsten wire. Hot pressed cobalt containing a random distribution of discontinuous wires (10 mil, 5 mil or 2 mil cut into 1/8 or 1/4 inch lengths) were hot rolled into 0.050 inch sheet. Crack-free sheets were obtained from compacts containing up to 30 vol. percent of 5 mil wire and up to 20 vol. percent of 10 mil wire. Hot rolled cobalt sheets (0.050 inch) containing 10, 20 or 30 vol. percent of tungsten wire of either 10 mil, 5 mil or 2 mil diameter and lengths of 1/8 or 1/4 inch in a random pattern were weaker than pure cobalt at room temperature. However, at 2000F, the cobalt sheet containing a random pattern of tungsten wire was approximately twice as strong as pure cobalt sheet.