Heat-treated material having improved mechanical properties

A material comprising a transparent substrate coated with a stack of thin layers comprising at least one silver functional metallic layer and at least two dielectric coatings, each dielectric coating including at least one dielectric layer, so that each silver functional metallic layer is disposed between two dielectric coatings,

• wherein the stack comprises at least one zinc metallic layer located above or below a silver functional metallic layer and separated from the silver functional metallic layer by at least one intermediate oxide layer, the at least one intermediate oxide layer being chosen from layers comprising zinc oxide, titanium oxide or tin oxide, the zinc metallic layer and the intermediate oxide layer being situated in the same dielectric coating,
• a total thickness of an assembly of all the layers separating the silver functional metallic layer from the at least one zinc metallic layer being less than or equal to 25 nm,
• wherein, when the intermediate oxide layer is titanium oxide or zinc oxide, a total thickness of the assembly of all the layers separating the silver functional metallic layer from the at least one zinc metallic layer is greater than or equal to 6 nm, and
• wherein, when the intermediate oxide layer is zinc oxide, the intermediate oxide layer is a crystallized layer of zinc oxide.