The European standard EN 356 distinguishes between 3 resistance levels
for burglar-resistance and was virtually fully adopted from the DIN 52290-3 standard.

The following resistance levels result from the number of blows with an axe that is required to create a 400 x 400 mm opening:

widerstandsklassen   widerstandsklassen

Resistance levels according
to number of blows with an axe
in conformance with EN 356

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