Surface pressure break II

Mechanic surface load – long-term – dynamic / static

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; Aquarium glass of too small measurements fastened from 4 sides.
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.
Lines of process	From angle to angle, of S and arc form; Parallel to the longer edge, often furcating; Direct, bent, but not angular break lines.
End	From the middle of the glass till the angle or near the angle of the glass.
Other features	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; In the single glass curvilinear cracks in the load side.

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