Flame spread (Fs) <150mm within 60sec (when exposure time is 30 seconds)
EN ISO 11925-2 Principles and Methodology (Source: Efectis)
The EN ISO 11925-2 Ignitability of building products subjected to direct impingement of flame – Part 2: Single-flame source test results are required for a classification E – B (combined with test results from EN 13823), as well as for classification Efl – Bfl (combined with test results from EN ISO 9239-1).
The test determines the ignitability of a vertically oriented test specimen when exposed to a small flame, either at the edge or the surface of the specimen. The burning behaviour of the specimen is observed for flame spread, and the occurrence of burning particles and droplets.
The test report contains information about the test specimens and test results. The following information is given in the test report:
- the exposure time used in the test (15 or 30 s)
- the exposure mode (edge – surface)
- whether the flame tip reaches and/or passes the 150 mm mark above the flame application point, and the time at which this occurred
- whether burning droplets were observed, which ignited the filter paper in a tray underneath the test specimen
The test results described above can be used for assessing a classification according to EN 13501-1. Normally, this is done based on the average of 6 – 12 single tests. The criteria depend on the classification which is aimed for. For classification D – B, 30 s exposure is required, and the flame height should not exceed 150 mm within 60 s after the start of the test. For the (other) classifications (E and Efl ), 15 s exposure is required, and the flame height should not exceed 150 mm within 20 s after the start of the test.
For the flooring classifications, and for end-use applications where edge exposure is not possible, only surface exposure is applied. In all other cases, edge exposure is applied in addition to the surface exposure.
The specimens shall be representative of the product in its end-use application, as far as possible. This applies specifically to the use of standard substrates, as described in EN 13238.
Essentially flat specimens shall be used: Dimensions: 250 mm x 90 mm.
Thickness: maximum 40 mm (including substrate when used).
Eight specimens must be cut in the direction of production and four specimens must be cut at 90° to the direction of production.
Test method (source: Exova Warringtonfire)
The specimen is mounted vertically into the test frame and two pieces of filter paper are placed below the specimen. The defined test flame may be applied in a number of manners, dependent upon the requirements of the specification document:
- 15 seconds surface application
- 15 seconds edge application
- 30 seconds surface application
- 30 seconds edge application
The test duration is as follows
- 15 second flame application time, total test duration = 20 seconds
- 30 second flame application time, total test duration = 60 seconds
In all cases, observations are made as to whether the flame tip reaches a point 150mm above the original flame application point within the test duration and whether the filter paper was ignited by any flaming debris / droplets, etc.
Generally six specimens are tested with each flame application type required.