Method of forming lithium-free glass articles having improved compressive stress and reduced warp

Abstract

above an annealing point of the glass article; holding the glass article at the hold temperature for a hold period; cooling the glass article at a first cooling rate from the hold temperature to an intermediate temperature; and cooling the glass article at a second cooling rate from the intermediate temperature to room temperature. The ion exchanged glass article includes a compressive stress greater than or equal to

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