California Glass Expert performs a failure analysis on a tempered glass oven door that failed in bending. Normally the fracture surface of tempered glass shows two sets of Wallner lines that are separated by a band of mist hackle. However if the tempered glass window failure is due to bending, the band of mist hackle is shifted toward the tensile side of the bend. Upper left is a photo of the tempered glass failure. The failure originated at an edge and progressed inward. A representative fracture surface is shown on the right, and the failure origin is shown on the left.
