Thermal crack in the form of a palm tree / fan

Evenly distributed or spot thermal load – big 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	Partial inside covering of glass under intense shining sun; High heating of the edge (blowlamp, hot air ventilator); Heating pipe in close proximity to the glass.
Beginning	Right-angled edge crack; Right-angled transition angle; No curvilinear cracks in the beginning.
Lines of process	Straight line of edge crack; Change of direction near the cold/heat zone; Further sequence of crack in the form of a palm tree.
End	Straight line; Very rarely with an angle.
Other features	Curvilinear cracks form very rarely; Curvy lines are frequent and they happen first in the zone of the first change of direction.

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