Dual silver layer Low-E glass coating system and insulating glass units made therefrom

摘要

A sputter-coated glass layer system particularly useful in insulating glass units ("IGs"), which includes dual layers of silver separated by a layer of Si3N4 having a thickness of about 700 ANGSTROM - 1,100 ANGSTROM and further including an undercoat and an overcoat of Si3N4 having thicknesses of about 300 ANGSTROM - 550 ANGSTROM and about 350 ANGSTROM - 700 ANGSTROM respectively, such that a glass so coated achieves normal emissivity values (En's) of less than about 0.02 - 0.09 with good durability and very low reflectance. IMAGE