Tin Cure Silicone Rubber 30 Shore A RTV-2 Liquid Silicone for Cement Wall Tile Molds This 30 Shore A tin cure (condensation-cure) RTV-2 liquid silicone rubber is a two-component mold-making silicone supplied as HN-630 in the HN-6XX series. Mixed at a simple 100:2 ratio by weight and cured at room temperature, it delivers a tough, hard-wearing elastomer with no oil bleed, excellent tear resistance, fine pattern replication and multiple demolding cycles — ideal for cement wall