ISO 5659-2-2012 pdf free download.Plastics一Smoke generation一 Part 2: Determination of optical density by a single-chamber test.
4 Principles of the test
Specimens of the product are mounted horizontally within a chamber and exposed to thermal radiation on their upper surfaces at selected levels of constant irradiance up to 50 kW/m2.
The smoke evolved is collected in the chamber, which also contains photometric equipment. The attenuation of a light beam passing through the smoke is measured. The results are reported in terms of specific optical density.
5 Suitability of a material for testing
5.1 Material geometry
5.1.1 The method is applicable to essentially flat materials, composites and assemblies not exceeding
25 mm in thickness.
5.1.2 The method is sensitive to small variations in geometry, surface orientation, thickness (either overall or of the individual layers), mass and composition of the material, and so the results obtained by this method only apply to the thickness of the material as tested.
NOTE It is not possible to calculate the specific optical density of one thickness of a material from the specific optical density of another thickness of the material.
5.2 Physical characteristics
Materials submitted for evaluation by this method could have faces which differ or could contain laminations of different materials arranged in a different order in relation to the two faces. If either of the faces is likely to he exposed to a fire condition when in use, then both faces shall be evaluated.
6 Specimen construction and preparation
6.1 Number of specimens
6.1.1 The test sample shall comprise a niiniinum u 1 specimens if all four modes are to be tested: six specimens shall be tested at 25 kW/m2 (three specimens with a pilot flame and three specimens without a pilot flame) and six specimens shall be tested at 50 kW/m2 (three specimens with a pilot flame and three specimens without a pilot flame).
If fewer than four modes are to be tested, a minimum of three specimens per mode shall be tested.
6.1.2 An additional number of specimens as specified in 6.1.1 shall be used for each face, in accordance with the requirements of 5.2.
6.1.3 An additional 12 specimens (i.e. three specimens per test mode) shall be held in reserve if required by the modes specified in 10.9.
6.1.4 In case of intumescent materials, it is necessary to make a preliminary test with the cone heater at 50 mm from the specimen, so at least two additional specimens are required.
6.2 Size of specimens
6.2.1 The specimens shall be square, with sides measuring 75 mm ± 1 mm.ISO 5659-2 pdf download.