MATERIAL COMPRISING A SUBSTRATE PROVIDED WITH A STACK HAVING THERMAL PROPERTIES

The invention concerns a material comprising a transparent substrate coated on a face of a stack of thin layers comprising, successively, starting from said face, an alternation of three functional metallic layers made from silver Ag1, Ag2 and Ag3 and four dielectric coatings M1, M2, M3 and M4, of optical thicknesses Eo1, Eo2, Eo3 and Eo4 respectively, each dielectric coating comprising a dielectric layer or an assembly of dielectric layers, such that each functional metallic layer is disposed between two dielectric coatings, said material being characterised in that: - the physical thickness Ea2 of the second functional layer Ag2 is greater than the physical thickness Ea1 of the first functional layer Ag1, with 1.40 ≤Ea2/Ea1 ≤ 1.60; - the physical thickness Ea3 of the third functional layer Ag3 is greater than the physical thickness Ea2 of the second functional layer Ag2, with 1.05 ≤ Ea3/Ea2 ≤ 1.2; - the dielectric coating M4 has an optical thickness Eo4 less than each of the optical thicknesses Eo1, Eo2 and Eo3 of the other dielectric coatings M1, M2 and M3; and - the dielectric coating M3 has an optical thickness Eo3 greater than each of the optical thicknesses Eo1, Eo2 and Eo4 of the other dielectric coatings M1, M2 and M4.