Surface pressure break III

Mechanic surface load – short-term – dynamic / static - big intensity

Type of glass	Polished glass, rolled sheet glass, laminated glass, ornamental glass; very often glass pack.
Examples	Too big load due to the temperature, air pressure, and / or height differences between the glass packs production and installment places; Snow avalanche from the roof; Glass pack filling with too cold gas.
Beginning	Edge crack angle in all directions, not upright; not visible centre of fragmentation; Transition angle not upright; There are no angular cracks by the glass edge; From angle to angle, of arc form much furcating ; Break lines relatively parallel to the longer edge, when there‘s a big relation of lines; Direct, round, but not angular break lines.
Lines of process	From the middle of the glass always till the angle or near the angle of the glass
End	Surface curvilinear fragmentations; in the convex pieces of glass (usually the sub atmospheric pressure in the gap) – external curvilinear cracks, in the convex pieces of glass (overpressure in the gap) in the side of the gap, thus it is possible to recognize whether the break occurred due to the overpressure or due to the sub atmospheric pressure; With the increasing load, the number of fragmentations also increases
Other features	In the single glass curvilinear cracks in the load side

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