FIELD: glass industry.
SUBSTANCE: invention relates to glazing in buildings and passenger compartments of vehicles. In particular, disclosed is a material containing a transparent substrate coated with a stack of thin layers, successively including, starting from a substrate, alternating three functional metal layers based on silver, designated starting from substrate, as first, second and third functional layers, and four dielectric coatings, designated from substrate, as M1, M2, M3 and M4. At that, each dielectric coating contains at least one dielectric layer, provided that each functional metal layer is located between two dielectric coatings. Material has light transmission less than 50 %. Thickness of first functional layer is less than thickness of second functional layer, thickness of first functional layer is less than thickness of third functional layer. Ratio of thickness of the third functional metal layer to thickness of the second functional layer is between 0.90 and 1.10, including these values. Thickness of first functional metal layer is from 6 to 12 nm, thickness of second functional metal layer is from 15 to 20 nm, thickness of the third functional metal layer ranges from 15 to 20 nm. Each of dielectric coatings M1, M2, M3 and M4 has optical thickness Eo1, Eo2, Eo3 and Eo4, satisfying the following equation: Eo4 < Eo1 < Eo2 < Eo3. At that, optical thickness Eo1 of dielectric coating M1 is more than 80 nm, optical thickness Eo2 of dielectric coating M2 is more than 100 nm, optical thickness Eo3 of dielectric coating M3 of more than 120 nm, optical thickness Eo4 of dielectric coating M4 ranges from 70 to 120 nm.
EFFECT: technical result is minimization of solar factor and high selectivity with preservation of light transmission, suitable for good isolation and good visual perception.
14 cl, 1 dwg, 4 tbl
