Precast Concrete Panel and GRC Cladding Mold Silicone, 40 Shore A High Tear Platinum Cure Rubber Hanast HN-E640 is a 40 +/- 2 Shore A addition-cure (platinum-catalysed) liquid silicone rubber developed for large precast concrete panels, GRC and GFRC cladding, 3D wall panels and formwork liners. 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. The 40 Shore A hardness holds panel geometry, chamfers and
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