Abstract: Process for the protection of stone materials, marble, bricks, and concrete, and of structures made from such materials, against the decay caused by atmospheric agents and pollutants, by applying to the surface of said materials or structures a mixture which is constituted by:(1) polytetrafluoroethylene in the form of a fine powder;(2) a perfluoropolyether not bearing functional groups; and/or(3) a perfluoropolyether or a fluoropolyether having a chain end, or both chain ends, constituted by functional groups which are capable of forming a chemical and/or physical bond with the material to be protected.The invention also relates to a process for preventing, on the normal materials for building industry and lining materials, the decay effects caused by writings made by using spray paits or brush paints, inks, and the like.

Abstract: The surface of stone materials, of tiles, of cement mixes and articles and structures manufactured therefrom are protected against atmospheric and polluting agents by superficially applying a protecting material consisting of a vinylidene fluoride polymer or copolymer comprising 55-100% by moles of vinylidene fluoride, 0-5% by moles of propene hexafluoride and 0-30% by moles of tetrafluoroethylene. Such polymers or copolymers are applied to the surface to be protected in the form of a solution in volatile solvents.

Abstract: A process for protecting marble, stones, tiles, cement and similar materials from the action of atmospheric and polluting agents, by applying a perfluropolyether to the surface of the manufactured article, characterized by using a perfluoropolyether having at one or at both ends functional groups capable of acting as anchoring agents for the substrate.

Abstract: A process for protecting manufactured structures or articles of marble, stones, tiles, cement and the like from the action of polluting and atmospheric agents, by applying a perfluoropolyether onto the surface of the manufactured structure or article, characterized in that there is utilized a perfluoropolyether having at one or both its ends functional groups selected from carboxylic, ester or amidic groups.

Abstract: Marble, stones, tiles and articles manufactured from such materials are protected from the degrading action of atmospheric and polluting agents by applying to the surfaces of said materials and manufactured articles, a protecting agent which is a perfluoropolyether as such or diluted with a solvent or a mixture of solvents having a boiling temperature lower than 80.degree. C., preferably a fluorochlorohydrocarbon.