EN ISO 11925-2 Fire Resistance Tests - Flammability upon Direct Exposure to Flame - Part 2: Test with Single Flame Source

Product Safety Tests

EN ISO 11925-2 Fire Resistance Tests - Flammability upon Direct Exposure to Flame - Part 2: Test with Single Flame Source

This part of the EN ISO 11925 standard developed by the International Standards Organization (ISO) is a small-scale reaction to fire test. It is designed to determine the flammability of a product by directly exposing a vertically oriented sample to a small flame.

EN ISO 11925-2 Fire Resistance Tests - Flammability upon Direct Exposure to Flame - Part 2: Test with Single Flame Source

The EN ISO 11925-2 test is performed inside a stainless steel walled combustion chamber with a height of 50 mm and an open square area of ​​25 mm x 25 mm. At the front and at least one side of the room are heat-resistant glass doors for access and observation. To allow free ventilation, the chamber sits on 40mm high supports providing an air gap on the side.

A flat test specimen measuring 250 mm x 90 mm and no thicker than 60 mm is clamped in a vertical U-shaped holder. Samples can be tested for surface exposure, edge exposure (this includes single-layer or multi-layer), or both. At least six specimens will be tested for each test orientation.

A propane gas burner is mounted at a 45° angle so that the flame application:

  • 40 mm above the lower edge of the sample (surface exposure),
  • At the midpoint at the bottom of the sample (edge ​​exposure for samples < 3 mm thick),
  • 1,5 mm behind the surface (edge ​​exposure on samples > 3 mm thick), or
  • At the lower edge of the centerline of the underside of each discrete layer (edge ​​exposure > 90 mm thick in multi-layer specimens) with the test specimen rotated by 10° around its vertical axis.

Filter paper is placed under the sample to collect the flaming droplets/particles. At least six specimens will be tested for each test orientation. Typically, 6 – 18 samples are tested individually. It is recommended to test at least six samples against each ignition source and for each ignition time: three for surface ignition; and three for sub-firing.

Among the services provided by our organization within the framework of material testing services, there are also EN ISO 11925-2 standard tests.

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