This European standard specifies the physical and performance requirements, methods of test, and marking requirements for industrial safety helmets for general use in industry. Industrial safety helmets are intended primarily to provide protection to the wearer against falling objects and consequential brain injury and skull fracture.
When tested by the method given in section 6.11, the maximum lateral deformation of the helmet shall not exceed 40 mm, and the residual lateral deformation shall not exceed 15 mm and observe the extent of damage, if any to be noted.
The test procedure is set up using Bluehill® TestProfiler to build the ramps and dwell times to apply the loading sequence profile as described below. The helmet is placed transversely between rigid parallel plates.
An initial force of 30 N is applied perpendicular to the plates so that the helmet is subjected to a lateral force. After 30 seconds the distance between the compression plates shall be measured (dimension x).
The force is then increased up to 430 N, which is held for 30 seconds, after which the distance between the plates shall again be measured (dimension y).
Finally, the force is decreased to 25 N and then immediately increased to 30 N, which is held for 30 seconds, after which the distance between the plates shall again be measured (dimension z).
Bluehill Expression builder is used to simply create the below custom calculations.
- The maximum lateral deformation is the difference between dimensions x and y
- The residual lateral deformation is the difference between dimensions x and z
We suggest using a tensile testing system of dual-column tabletop design together with the test fixture.
Bluehill® Software package is used to input specimen parameters, set the desired speed control, automatically calculate the desired results and statistics, and finally to product a test report or send to a network database.
We suggest reviewing EN 397 Section 6.11 to fully understand the test fixture and results requirements prior to performing any tests.