Tin Cure Silicone Rubber 30 Shore A 100:2 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, industrial-grade 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 cures to a firmer yet tough elastomer with no oil bleed, good tear resistance, fine pattern replication and multiple demolding cycles — a