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.
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:
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.
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