Cast Stone and Concrete Countertop Mold Silicone, 40 Shore A Dual Cure Food Grade Rubber Hanast HN-E640 is a 40 +/- 2 Shore A food grade addition-cure (platinum-catalysed) liquid silicone rubber for cast stone, concrete countertops, basins, sinks and architectural cladding molds where a hard, dimensionally stable tool is needed. Components A and B are mixed 1:1 by weight and cure in 3-4 hours at room temperature or in 20 minutes or less at 80-100 °C, so the same material
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