What are the resistence class from 1 to 6 (WK 1-6)?

How do I choose my armored door?

Every armored door has a factor of safety called security class. This is an international classification which allows customers to compare different products based on the characteristics and the performances of the doors. There are six classes, which goes from 1 to 6. Let’s see now what each of these classes means and how to calculate the ideal security class for your building.

The security classes are based upon the resistance of the door against breaking attempts. Each class define the resistance against a certain set of tools and kind of attempts. To be ranked and certified, every door and/or window must be tested and succeed in a test made by a certification body.

Here the kind of classes and their meanings:

Class 1: the door resist to braking attempts made with the sole use of strength. Ex. Attempts made by throwing kick, pushing and hitting the door.

Class 2: the door resist to breaking attempts made with the use of simple tools such as screwdrivers and pincers.

Class 3: the door resist to breaking attempts with the use of a combination of screwdrivers and crowbars.

Class 4: the door resist to braking attempts made with saws, chisels, hammers and battery drills.

Class 5: the door resist to braking attempts made with electric tools such as drills, saws, electric grinders with a section of max 125 mm.

Class 6: the door resist to breaking attempts made by strong electric tools, saw, and grinders with a section of max 250 mm.