ISO 5659-2-2012 pdf free download.Plastics – Smoke generation – Part 2: Determination of optical density by a single-cham ber test.
1.1 This part of ISO 5659 specifies a method of measuring smoke production from the exposed surface of specimens of materials, composites or assemblies. It is applicable to specimens that have an essentially flat surface and do not exceed 25 mm in thickness when placed in a horizontal orientation and subjected to specified levels of thermal irradiance in a closed cabinet with or without the application of a pilot flame. This method of test is applicable to all plastics and may also be used for the evaluation of other materials (e.g. rubbers, textile-coverings, painted surfaces, wood and other materials).
1.2 It is intended that the values of optical density determined by this test be taken as specific to the specimen or assembly material in the form and thickness tested, and are not to be considered inherent, fundamental properties.
1.3 The test is intended primarily for use in research and development and fire safety engineering in buildings, trains, ships, etc. and not as a basis for ratings for building codes or other purposes. No basis is provided for predicting the density of smoke that might be generated by the materials upon exposure to heat and flame under other (actual) exposure conditions. This test procedure excludes the effect of irritants on the eye.
NOTE This test procedure addresses the loss of visibility due to smoke density, which generally is not related to irritancy potency (see Annex E).
1.4 It is emphasized that smoke production from a material varies according to the irradiance level to which the specimen is exposed. The results yielded from the method specified in this part of ISO 5659 are based on exposure to the specific irradiance levels of 25 kW/m2 and 50 kW/m2.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13943.Fire safety— Vocabulary
ISO 14934-3, Fire tests — Calibration and use of heat flux meters — Part 3:Secondary calibration method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943 and the following apply.
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 be 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 minimum of 12 specimens if all four modes are to be tested: six specimens shall he 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 niode shall be tested.ISO 5659-2 pdf free download.
Tags: Plastics
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