Mechanical resistance EN 1192

If a door is to remain functional over time, three points are vitally important:

Long Life+ protection
frequency of use
mechanical resistance

The latter guarantees resistance to impacts, loads and torsion so that the door remains functional (remains a door) and retains its compartmentalisation capacity.

What happens if a door loses the capacity to function as a door? You can have a good burglary-resistant or fire-resistant door, for example, but if it no longer closes properly, then it no longer serves its compartmentalisation purpose.

If the door no longer works properly as a door, then there is no point to its safety features.
The safety features of the door are important but they are usually only needed occasionally (if there is a fire, an attempted break-in, etc.), whereas mechanical resistance is a permanent benefit.

Performance table

Standards	EN 1192	EN 947 Vertical angular load	EN 948 Static torsion	EN 949 Soft and heavy body impact	EN 950 Hard body impact
Symbols	M	MA	MB	MC	MD
Operating method
Resistance class Heinen	Mechanical resistance classes M:
	M1 M2 M3 M4	400 N 600 N 800 N 1000 N	200 N 250 N 300 N 350 N	30 J 60 J 120 J 180 J	1.5 J 3 J 5 J 8 J
	Improved mechanical resistance M+*
	M+5 M+6 M+7	1400 N 1800 N 2000 N	500 N 700 N 1500 N	240 J 300 J 500 J	15 J 25 J 40 J

*Additional classes only in STS 53

European standard of strength requirements EN 1192

The European standard

European standard EN 1192 “Doors. Classification of strength requirements” provides a classification method for the performance of door leaves, frames, door sets, door sets assembled according to their resistance to vertical loads, static torsion, soft and heavy impacts and hard impacts. Special requirements, such as those for burglary resistance or safety requirements relating to glass infillings are not covered in this standard.

Improved Mechanical Resistance (IMR)

One of the basic performance features of Heinen Metal+ hung doors is class M+7 Improved Mechanical Resistance (IMR) to avoid premature ageing due to accidental or intentional impacts.

IMR is based on four tests described in standard EN 1192:

Resistance to vertical angular loads (MA)
A variable load is applied in the plane of the door leaf open at 90°, at the point furthest from the hinges.
Resistance to static torsion (MB)
A variable load is applied perpendicular to the door leaf when closed, at the bottom point furthest from the hinges.
Resistance to soft and heavy body impacts (MC)
A soft sphere, of fixed diameter and mass, suspended on a cable, collides with a vertical door set.
Resistance to hard body impacts (MD)
A hard sphere, of fixed diameter and mass, is released above a horizontal door set.