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The amount of initiator and promotors in the solidification of powdered cation exchange resins depended on their water content. In case of anion exchange, however, the ratio of unsaturated polyester / benzoyl peroxide / dimethyl aniline for the effective solidification was 100g/0.03g/0.015 ml without regard to water content. The volume and weight change ratio of the solidified forms incorporating cation and anion exchange resins containing water below 33.2% was above 10% in immersion test. And the fractional conversion rate was 96.6% when the powdered ion-exchanger was oxidized by 0.02M-Fe(+2) at the ratio of resin/hydrogen peroxide = 0.092. The anion exchanger could be oxidized by Cu(+1) cocatalyst, and catalyst content could be decreased 0.2 when the reduction cathode was used. The highest ratio of polymer / cement in a composite waste forms is about 0.075 (Polyester) and 0.20 (epoxy resin and SBR latex) for workability, curing time and mechanical properties. 6 refs., 23 figs., 19 tabs.