Large thermal crack

Evently distributed thermal load - high intensity
Type of glass

Polished glass, figured (ornamental) glass, rolled sheet glass, laminated glass. In case of armoured glass, deviations are possible due to the grid.

Examples

Welding torch is in close proximity to the glass;

Hot air ventilator is in close proximity to the glass;

Laying of asphalt, when glass is covered with the protective cover inevently;

Partial internal covering of glass in strong sunshine.

Beginning

Right-angled edge crack;

Right-angled transition angle;

No curvilinear cracks in the begining.

Lines of process

Straight line of edge crack;

Change of direction near the cold / heat zone, most often turning into several cracks, later the line is curvy.

End

Straight line;

Very rarely with an angle.

Other features

Curvilinear cracks are possible, primarily in the zone of the first change of direction.

Curvy lines may form, primarily in the zone of the first change of direction.