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Fractures caused by excessive exposure to heat can always be distinguished from those caused by impact, since those that are due to heat do not show a regular pattern of radial and concentric fractures, but are characteristically wave-shaped.
Fractures that form a series of broken circles, or arcs, around the point of impact are called concentric fractures.
Due to the structure of safety glass, cracking is frequently incomplete, neither radial nor concentric fractures penetrate completely from one side to the other.