EN ISO 11925-2 Response to Fire Tests - Flammability of Products Exposed to Direct Impact of Flame - Part 2: Single Flame Source Test

In the EN ISO 11925-2 standard published by the International Standards Organization (ISO), a test method for determining the flammability of products by direct small flame impact using vertically oriented test specimens is presented.

Information about the precision of this test method is given in the annex to the standard (Annex A). At the same time, information on testing non-flat end-use products (Annex B) and information on testing perforated end-use products (Annex C) are also included in the standard annex.

The test method presented in EN ISO 11925-2 is designed to assess flammability, but this issue is addressed by measuring the spread of flame on the vertical surface of the sample within 15 or 30 seconds after a small flame (match size) is applied to the surface or edge of the sample. Determining the formation of flaming droplets or particles depends on whether the filter paper placed under the sample is ignited.

While performing this test, the sample is exposed to the direct impact of a small flame. The 250 mm × 90 mm test specimen is mounted vertically in a “U”-shaped specimen holder. A 20 mm high propane gas flame is brought into contact with the sample at an angle of 45 degrees. The application point is determined as follows:

• Surface exposure: 40 mm above the lower edge of the surface centerline
• Edge exposure: center of the width of the bottom edge
  Filter paper is placed under the sample holder to monitor the fall of flaming debris.

Two different flame application times and test times are used according to the product class:

• For class E, the flame application time is 15 seconds and the test is terminated 20 seconds after the flame is removed.
• For classes B, C and D, the flame exposure time is 30 seconds, the maximum duration of the test is 60 seconds after the flame is removed, and the test is terminated earlier if no ignition is observed or the sample ceases to burn after the flame source is removed.

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