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Foundry use bentonite powder is a clay-based binder, primarily used in sand molds for metal casting to provide high binding strength and plasticity. This high-swelling sodium bentonite creates strong, durable molds by effectively binding sand grains and maintaining their shape under high temperatures. Key benefits include improved mold strength, clean shakeout, good gas permeability, and reduced defects like cracking and erosion, leading to high-quality castings.