Jam crack

Mechanic spot or evenly distributed load – short-term dynamics – long static

Type of glass	Polished glass, rolled sheet glass, laminated glass, ornamental glass.
Examples	Too small or wrong supporting wooden bricks, when the weight of the glass is big; Wrong installment of the glass belt; No respect towards the change of the glass / frame.
Beginning	The edge crack angle in all directions, not upright; Transition angle not upright; Visible outlet point in the edge zone; Possible angular cracks in the break centre.
Lines of process	Always last till the edge; Direct break lines; Short cracks; Often reverse lines till the edge, when there are long cracks.
End	Direct lines.
Other features	No angular cracks in the middle area.

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