ISO 4589-3:2017
Plastics — Determination of burning behaviour by oxygen index — Part 3: Elevated-temperature test
Plastics — Determination of burning behaviour by oxygen index — Part 3: Elevated-temperature test
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 19
- Дата публикации:
- 12 апреля 2017 г.
- Издание:
- ISO IS 4589 edition 2 version 1
- ICS:
- 13.220.40
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. 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. 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
Abstract
Overview
ISO 4589-3:2017 - "Plastics - Determination of burning behaviour by oxygen index - Part 3: Elevated‑temperature test" - specifies laboratory methods to determine the minimum oxygen concentration (oxygen index, OI) that will support flaming combustion of small vertical plastic specimens at elevated temperatures. Test temperatures covered range from 25 °C to 150 °C (typically 40 °C to 150 °C) and produce temperature index (TI) values that represent the oxygen fraction required to sustain combustion at a given test temperature. The standard also includes an Annex A method to determine the flammability temperature (FT) - the temperature at which OI in air (20.9 % O2) just supports combustion (limited to temperatures < 400 °C).
Key topics and technical requirements
- Scope of materials: Self‑supporting bars or sheets up to 10.5 mm thick; suitable for solid, laminated or cellular plastics with apparent density ≥ 100 kg/m³ (and some cellular materials with lower density). A method is provided for vertically supported flexible sheets and films.
- Not applicable cases: Form V specimens (which require supporting frames as per ISO 4589‑2) and materials with OI < 20.9 % for the FT method.
- Apparatus and setup: Heated transparent test chimney with controlled upward flow of oxygen/nitrogen mix, specimen holder, gas supply and control, oxygen analyser, flame igniter and fume extraction. Temperature control around the specimen must be within specified tolerances.
- Test principle: Ignite the top of a vertical specimen in a controlled O2/N2 atmosphere at a set temperature and observe burning to determine the minimum oxygen fraction that just sustains flaming combustion (the TI).
- Reporting and limits: Results expressed as TI (at test temperature) or FT (temperature at which OI = 20.9 %). The standard notes that results alone do not substitute for full fire hazard assessment.
Applications and who uses it
- Material and polymer manufacturers assessing elevated‑temperature flammability of plastics.
- Independent testing laboratories performing standardized fire‑behaviour tests.
- Product designers and component engineers specifying materials for overheated or high‑temperature service environments (electrical enclosures, appliances, automotive under‑hood components).
- Regulatory bodies and compliance teams referencing standardized oxygen‑index data for product safety documentation and risk assessments.
- Fire safety and materials researchers comparing temperature‑dependent flammability performance.
Related standards
- ISO 4589-1 - General requirements for oxygen index testing
- ISO 4589-2:2017 - Ambient‑temperature oxygen index test (basic OI method)
- ISO 13943 - Fire safety vocabulary
Keywords: ISO 4589-3:2017, oxygen index, elevated-temperature test, flammability temperature, temperature index, plastics testing, burning behaviour.
Технические детали
- Технический комитет
- ISO/TC 61/SC 4 - Burning behaviour
- SKU
- ISO 4589-3:2017
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