The Safety Company What are basic specifications for industrial helmets from EN397?
The basic specifications in EN 397 contain tests for shock absorption, penetration and flame resistance as well for chinstrap anchorage.
What do the tests for shock absorption and penetration resistance involve?
For the shock absorption test a 5 kg round metal object is dropped onto the helmet from a height of 1 m (corresponds to 49 J). The test is deemed passed if the force transferred to the headform is < 5 kN. In the test regarding penetration resistance a 3 kg sharp-edged object (30°) is dropped from a height of 1 m (corresponds to 29.5 J). The striker is not allowed to touch the headform. Both tests are carried out on a total of 8 helmets which have each received another pretreatment up to 24 hours before: cold -10°C, heat +50°C, submerged in water, artificial ageing for 4 hours using a xenon lamp.
What does the test for chin straps involve?
In the chin strap anchorage test a continuously increasing tensile force is exerted on the chin straps, the chin strap anchorage should release at a minimum force of 150 N and no more than 250 N. Through this it is ensured that the chin strap holds but the user is not strangled if he gets stuck. All chin straps offered by the manufacturer must be tested with all helmets offered.
What does the test for chin straps involve?
In the chip strap anchorage test a continuously increasing tensile force is exerted on the chin straps, the chin strap anchorage should release at a minimum force of 150 N and no more than 250 N. Through this it is ensured that the chin strap holds but the user is not strangled if he gets stuck. All chin straps offered by the manufacturer must be tested with all helmets offered. What does the test for flame resistance involve? The test regarding flame resistance includes holding the helmet shell on the burner for 10 seconds. 5 seconds after removing it from the burner there should no longer be a flame burning.
What are additional specifications for industrial helmets from EN397?
Tests at very low temperatures -20°C or -30°C, very high temperatures +150°C, molten metal, lateral deformation and electrical insulation are included in the optional additional specifications in EN 397. The tests are explained in the question about
"marks in the helmet shell".
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