FIELD: manufacturing technology.
SUBSTANCE: invention relates to a coating for window glass. In particular, disclosed is coating with low emissivity, containing: first phase-coaxial layer containing zinc and tin oxides; a first functional layer of metal arranged on top of the first phase-coaxial layer and containing silver having a geometric thickness in range of 6 nm to 8 nm; a first primer layer placed over the first functional metal layer; a second phase-coaxial layer arranged on top of the first primer layer and containing zinc and tin oxides having optical thickness in range of 155 nm to 178 nm; second functional layer of metal arranged on top of second phase-coaxial layer and containing silver having geometric thickness in range from 8 nm to 10 nm; second primer layer arranged above second functional layer of metal; a third phase-coaxial layer arranged on top of the second primer layer and a protective layer placed on top of the third phase-coaxial layer. At that, coating with low emissivity provides summer/day coefficient of solar heat gain (SHGC) of standard insulating glazing unit (IGU) of at least 0.4 and winter/night total heat transfer coefficient (U index) of standard IGU is not more than 0.4 BTU/hour-foot2-°F. Invention also discloses insulating glass unit containing said coating.
EFFECT: high level of insulation of the window owing to reduction of the coefficient of solar heat influx.
14 cl, 3 dwg, 7 tbl
