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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.