Surface pressure break IV (explosion fragmentation) – polished glass

Mechanic surface load - short-term – dynamic – very big intensity

Type of glass	Polished glass, rolled sheet glass, laminated glass, ornamental glass; also glass pack.
Examples	Very big load due to the temperature, air pressure, and / or height differences between the glass packs production and installment places; Filled too cold gas and a big gap in the glass pack; Explosion.
Beginning	Edge crack angle in all directions, not upright; Not visible centre of fragmentation; Transition angle not upright; There are no curvilinear cracks by the glass edge.
Lines of process	From edge to edge, of arc form; Break scheme with cross cracks that increase towards the gap in the middle of the glass; Direct, often round break lines
End	From the middle of the glass always 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 angular 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 angular cracks in the load side; In the case of explosion, angular cracks in the load side.

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