Completely disperse the "Carbopol" 941 resin in the methanol and neutralize the dispersion with the amine. Stir in the powdered steel. Note: The suspension above is poured into plaster casts, vibrated under vacuum to eliminate voids, and dried at 82'C (180'F) in a circulating air oven. After drying, the molded parts exhibit unusually good green strength and excellent surface finish. Although no mold release agent is used, the castings do not stick to the plaster mold. After sintering in a hydrogen atmosphere, the resulting casting has maintained its excellent surface and displayed very high specific gravity.
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