NF EN ISO 4589-3
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Plastics. Determination of burning behaviour by oxygen index. Part 3 : elevated-temperature test.
Specifies methods for the determination the minimum concentration of oxygen, in a mixture with nitrogen, that will support combustion of small vertical test specimens under specified test conditions over a range of temperatures between 25 °Celsius and 150 °Celsius. The results are defined as oxygen index values at the test temperature. Also included is a method for determining the flammability temperature (less than 400 °Celsius) at which the oxygen index of small vertical test specimens in air is 20,9.
Specifies methods for the determination the minimum concentration of oxygen, in a mixture with nitrogen, that will support combustion of small vertical test specimens under specified test conditions over a range of temperatures between 25 °Celsius and 150 °Celsius. The results are defined as oxygen index values at the test temperature. Also included is a method for determining the flammability temperature (less than 400 °Celsius) at which the oxygen index of small vertical test specimens in air is 20,9.
<p>ISO 4589-3:2017 specifies methods for determining the minimum volume fraction of oxygen, in a mixture with nitrogen, that will support combustion of small vertical test specimens under specified test conditions over a range of temperatures between 25 °C and 150 °C. The range of temperatures is typically between 40 °C and 150 °C. The results are defined as temperature index values at the test temperature, which is typical of the practical temperature that a plastic material can experience in an overheated service situation.</p> <p>Methods are provided for testing materials that are self-supporting at the test temperature in the form of vertical bars or sheet up to 10,5 mm thick. However, they are not applicable to form V which requires a supporting frame as defined in ISO 4589‑2:2017, Table 2. These methods are suitable for solid, laminated or cellular materials characterized by an apparent density 100 kg/m3 or higher. The methods are also applicable to some cellular materials having an apparent density of less than 100 kg/m3. A method is provided for testing flexible sheet or film materials while supported vertically.</p> <p>ISO 4589-3:2017 also includes a method (see Annex A) for determining the temperature at which the OI of small vertical test specimens in air is 20,9 % under specified test conditions. The temperature at which this occurs is defined as the flammability temperature (FT) and the method is limited to the determination of temperatures less than 400 °C. The method is not applicable to materials having an OI of <20,9 %.</p>
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1 Domaine d'application1
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2 Référence normative1
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3 Définitions2
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4 Principe2
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5 Appareillage2
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6 Calibrage et maintenance de l'appareillage3
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7 Préparation des éprouvettes3
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8 Mode opératoire4
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9 Calculs et expression des résultats4
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10 Procédé C - Comparaison avec une valeur minimale spécifiée de l'indice d'oxygène à une température spécifiée (procédé court)5
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11 Fidélité5
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12 Rapport d'essai5
- Annexe A Mesurage de la température d'inflammabilité (TI)13
- Annexe B Résultats de l'essai interlaboratoire portant sur la température d'inflammabilité15
- Annexe C Exemple de feuille de résultats16
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