MULTI-LAYER GLASS SHEET MADE BY CO-DRAWING USING THE OVERFLOW DOWNDRAW FUSION PROCESS

摘要

Transparent glass sheets having increased mechanical strength include an inner layer surrounded by surface compressive layers wherein the difference of the coefficient of thermal expansion of the inner layer and the surface compressive layer is greater than 50x10-7°C-1 and wherein the surface compressive layer has a compressive stress of at least about 300 MPa.