Abstract
In the shell molding process, catalytic decomposition of phenolic resin on resincoated sand in the presence of sepiolite was investigated. Phenolic resin-coated sand mixed with sepiolite liberated less amounts of smoke and irritating gases than that without sepiolite not only in the molding, but also in the casting. The results indicate that the sepiolite has promoted thermal decomposition of the irritating gases as catalyst. The bending strength of the mold decreased with the increasing sepiolite contents
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