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Mapefast Ultra and Mapefast Ultra N are chloride-free liquid hardening accelerators of the latest generation for mortar and concrete. Mapefast Ultra and Mapefast Ultra N are admixtures that may be used in all concrete mixes prepared in pre-cast plants and concrete mixing units. They act as catalysers for the nucleation and growth process of hydration products of the cement and rapidly accelerate the development of strength during short curing cycles, including at low temperatures.