The European standard EN 356 regulates the testing procedure for the evaluation of burglar-proof glazing.
For burglary testing, an axe is fastened into a machine.
The objective is to strike an opening of 40 x 40 cm into the tested sheet. The axe is mechanically handled and strikes precisely to the millimetre and with defined force. The number of strikes that are needed to produce the designated opening then define the resistance class.
