Strength, durability & service life testing

Durability and service life is a key factor in decision making for specifiers and purchasers, and Exova has much experience in this area of testing.

Certain end-users may require doors to be used more frequently and subjected to more physical abuse than others, e.g. in school or hospital corridors. In such cases it is vital that these doors are suitably durable so that they will be able to continue to perform their everyday function as well as maintain their fire resistance or security functions as required.

Depending on their location, doors must withstand varying levels of traffic and abuse, e.g. a door in a cross-corridor of a school is subject to heavy traffic and frequent abuse, while a classroom door in the same school must withstand similar abuse, but less frequently. The entrance door to a large office block has a lot of traffic, but generally lower levels of abuse, while a door within that office is likely to have infrequent traffic and little abuse.

Manufacturers and facility managers have to consider such factors when trying to identify the performance levels of doors they are producing or selecting to ensure the doors are fit for purpose and not over or under engineered.

We have developed CDTM01, a testing programme to classify doorsets for service life. This programme allows doors to be manufactured and specified to meet the needs of their end use application with minimal maintenance.
About CDTM01
The CDTM01 test programme incorporates a number of performance characteristics from relevant British and European standards listed below:
  • vertical load
  • static torsion
  • soft and heavy impact
  • hard body impact
  • slamming open and shut
  • closure against obstruction
  • resistance to jarring and vibration
  • abusive force on handles
  • operating forces
  • cycling - as an indication of anticipated service life
CDTM01 classifications
Based on performance under the CDTM01 testing programme, doors can be classified against BS EN 12400: Windows and Doors – mechanical durability – requirements and classification. The classification is expressed as a category of duty:
Category of duty Example end-use 
Severe Educational establishments
Heavy Hospitals
Medium Offices
Light Dwellings

The requirements for each test reflects the doorset’s intended level of duty. Similar variations exist for strength and dimensional demands and these are reflected in the test programme requirements.The testing represents ‘reasonable’ use and abuse. If vandalism is likely to be a factor it is possible to carry out additional, more onerous, testing to reflect the sort of deliberate abuses associated with these activities.
Durability tests to British and European standards
In addition to CDTM01, we are able to test to a range of British and European standards for door and window durability, including:
Test standard Characteristics
BS EN 6375 Parts 1, 2 & 3 General performance requirements for door assemblies.In conjunction with PAS 24 testing for SBD
DD 171 Guide to specifying performance requirements for hinged or pivoted doors
EN 1191 Windows and doors - resistance to repeated opening and closing
EN 1192 Doors - classification of strength requirements
BS EN 12046-2 Operating forces
HTM58 NHS Estates: internal doors
These tests can be used to evaluate the following characteristics:
  • operating forces (effort required to operate windows and doors)
  • repeated opening and closing of doors and windows through cyclic testing
  • abuse in operation
Related services
Contact us
+44 (0)121 506 7500
Related information

CDTM01 Classification for service life



Secured by Design - doors & windows



CE marking of windows & external pedestrian doorsets