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Mineral pre-made mortars are mortars whose components are mixed at the factory and not on the construction site. They are divided into three different types – masonry mortar, rendering and plastering mortar, and screed material – depending on the type of application. Mineral rendering and plastering mortars are mixtures of one or more mineral binders, aggregates, water, and – if applicable – additions or admixtures for the manufacture of renders or plasters. Rendering and plastering mortars are applied to walls and ceilings in one or more layers as required. Alongside the aesthetic design of the surface, they protect against effects of the weather when used as external renders and provide an even substrate for paint coats and wallpaper when used as internal plasters. In the case of reinforced concrete ceilings and stairs, renders/plasters also serve as fire protection; when porous aggregates are added, they serve as thermal protection. Depending on the technical data, the base materials and processing aids used, and the practical application, rendering and plastering mortars are divided into the following product groups: normal/finishing render or plaster, normal/finishing render, or plaster with special properties, lightweight render, reinforcement fibre plaster, and insulating render with an especially high proportion of lightweight aggregates.