Superconductors have been prepared by impregnating porous glass with low‐melting‐point alloys such as those in the Pb&sngbnd;Bi&sngbnd;Sb system. The critical fields of many alloys in porous glass with a pore diameter of 32 Å are in excess of 100 kOe at 4.2°K. Samples have been prepared having critical current densities near 105A/cm2in low (< 10 kOe) magnetic fields.