Glass articles with residual stress and viscosity properties for sagging processes, and compositions for the same

A laminate glass article, comprising:

• a core glass layer comprising a first coefficient of thermal expansion (CTE);
• and
• a plurality of clad glass layers, each clad glass layer comprising a first primary surface, a second primary surface in contact with the core glass layer, and a second CTE that is lower than the first CTE,
• wherein a difference between the first CTE and the second CTE is in a range from about 10×10−7/° C. to about 70×107/° C.,
• wherein each of the core glass layer and the clad glass layers comprises a viscosity of about 109.9 Poise from about 550° C. to about 720° C., and
• a total thickness of the plurality of clad glass layers and the core glass layer ranges from about 0.15 mm to about 3 mm,
• wherein each clad glass layer of the plurality of clad glass layers comprises 0.5% to 8% Al2O3 by weight.

A laminate glass article, comprising:

• a core glass layer comprising a first coefficient of thermal expansion (CTE);
• and
• a plurality of clad glass layers, each clad glass layer comprising a first primary surface, a second primary surface in contact with the core glass layer, and a second CTE that is lower than the first CTE,
• wherein a difference between the first CTE and the second CTE is in a range from about 10×10−7/° C. to about 70×10−7/° C.,
• wherein each of the core glass layer and the clad glass layers comprises a viscosity of about 109.9 Poise from about 550° C. to about 720° C., and
• a ratio of a thickness of the core glass layer to a thickness of the plurality of clad glass layers is in a range from about 1 to about 20,
• wherein each clad glass layer of the plurality of clad glass layers comprises 0.5% to 8% Al2O3 by weight.