a method for producing a metal - containing transparent polymer by the reaction of a metal carboxylate , with a clear setting resin system comprising a thermosetting resin and a curing agent . the reaction occurs in a temperature in the range of from about 0 ° to about 100 ° c . under conditions which prevent air from being entrapped in the mixture , either during mixing of the reagents or during reaction . the metal carboxylate contains from about 20 to about 60 weight percent of metal . the reagents react for a time sufficient to form a transparent polymer . the resins include preferably epoxies , polyesters , polyurethane , polyisocyanurate , polyether sulfones , polyimides , and mixtures of two or more of these thermoset polymers . the final metal - containing transparent polymer preferably contains at least 15 % by weight of the metal . preferred metals include antimony , barium , bismuth , cadmium , cerium , cobalt , copper , iron , lead , molybdenum , tungsten , ranadium , and zirconium .