Sand adhesion, surface defects, and mold instability are among the most persistent quality challenges in green sand casting. Each one translates directly into rework, material loss, and production delays. ECOSIL™ addresses all three with a single, pre-formulated molding sand additive that combines high-quality foundry bentonite (GEKO™) with high-reactivity mineral coal — pre-balanced and homogenized for immediate use. As the formulation reaches casting temperature, the mineral coal component generates a thin, continuous lustrous carbon layer that isolates the mold sand from the liquid metal. This protective barrier prevents metal penetration into the sand, facilitates mold release, and produces smooth, high-precision cast surfaces — while the bentonite component ensures mold strength, compactability, and dimensional stability throughout the process. ECOSIL™ eliminates the need for separate dosing and complex additive adjustments, delivering consistent performance batch-to-batch with a single ready-to-use product.