PROTECTIVE CLOTHING FOR USE IN WELDING AND ALLIED PROCESSES
EN EN ISO 11611:2007 EN EN ISO 11611:2007 Protective clothing for use in welding and allied processes.
The contents of this standard
This standard consists of a series of tests, the most important of which are described in ISO 6942, ISO 9150, ISO 15025 and EN 1149-2. EN ISO 11611 has two classes. If the fabric passes all the tests, it is designated as Class 1. If the fabric receives a Class-2 rating for the ISO 6942 and ISO 9150 tests, it is designated as Class 2.
Different tests
ISO 6942
This is a test method for assessing fabrics and fabric combinations exposed to radiant heat. In this test, a fabric sample is exposed to radiant heat (infrared rays). The temperature on the reverse (unexposed) side of the sample is registered using a calorimeter. Subsequently, the length of time the sample the sample can remain exposed before its temperature rises by 24 C is measured. This test is also used for EN 531C and has two different classes.
ISO 9150
Determining the behaviour of fabrics when exposed to small spatters of molten metal. In this test, droplets of molten metal are spattered on a vertically suspended fabric sample. Subsequently, the number of droplets it takes to cause an increase in temperature of 40 °C on the reverse side of the sample is determined. This test also has two classes:
- Class 1 ≥ 15 droplets of molten metal
- Class 2 ≥ 25 droplets of molten metal.
ISO 15025
Test method for limited flame spread. The test consists of applying a flame to a fabric sample for 10 seconds. To pass the test, the after flame & smoulder times and formation of holes must be within the tolerances (set in the standard). This test is also used for EN 531A. The application of a flame can take place in two ways:
- in procedure A (leads to Class A1), the flame is applied horizontally (similarly to EN 470 and EN 531)
- in procedure B (leads to Class A2), the flame is applied laterally.
EN 1149-2
This is a test method for measuring the electrical resistance of a fabric sample and determining whether an electrical charge passes through the sample from the outside to the inside.