en356 prüfmethode  

According to the European
standard EN 356 burglar-resistant
glazing is tested and classified into
3 resistance levels.

To do this, a 900 x 1100 mm pane
is hit with an automatic 2.5 kg axe,
applying a force of approx. 300 Nm,
until an aperture of a 400 x 400 mm
square is achieved.

Unfortunately in compliance with measuring the required standards the blows are not specifically targeted at one spot like delinquents are bound to do in practice.  

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