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Single Pack, Crystallization Waterproofing System.Dubond's Hydro Coat Osmocem is a mortar with crystallizing osmotic action for water proofing concrete and masonry work against rising and descending damp. It is a single component, thixotropic and resistant to positive and negative hydraulic pressures. Hydro Coat Osmocem reacts with moisture and creates a continuous barrier of insoluble crystals. The capillaries are permanently blocked to the passage of water. However, vapour may pass through allowing structure to breathe. Rate and penetration of minerals depends on presence of moisture, free lime and density of concrete.