Thermal crack of the worm

Thermal spot load - very high intensity (Only in case of very large and especially thick glass units)

Type of glass	Polished glass, rolled sheet glass, laminated glass, thick glass laminated with pitch.
Examples	Welding torch is in close proximity to the glass; Hot air ventilator is in close proximity to the glass; High spot heating in the area of an extremely thick showcase glass or similar glass area.
Beginning	In the centre of the glass area; Beginning not near the edge; Impossible to distinguish between the beginning and end.
Lines of process	In the centre of the glass, in the form of a snake or worm, without significant change of direction.
End	In the centre of the glass area; Beginning not near the edge; Impossible to distinguish between beginning and end.
Other features	Possible small deviation of edges; Possible curvy lines; Often possible to observe not from any angle.

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