Nickel sulfide breakage of tempered glass “Spontaneous break”

Spot load – short-term – dynamic – high intensity

Type of glass	Only in case of tempered glass
Examples	Very rarely; Happens during 10 years after tempering of glass; Possible in all types of tempered glass; possible to avoid by trying to keep hot condition (>95%).
Beginning	Clear structure of butterfly form in the breakage centre (approximately 1-4 cm); Small inclusion of nickel sulfate (< 0,2 mm) as a black spot near the central line of the butterfly in the centre of the glass.
Lines of process	Net form, starting form the centre; Typical image of single safe glass shattering; Small fragments; Cracks in the entire area.
End	In the entire area, incalculable, in all edges, always up to the edge.
Other features	Shattering structure in the entire area; No curvy cracks in the centre; Not visible on single glass as the glass falls into fragments in case of cracking.

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