ISO 4589-2:2017

  • Specifies methods for determining the minimum volume fraction of oxygen (in a nitrogen mixture) that supports combustion of small vertical test specimens under specified conditions.
  • Results are defined as Oxygen Index (OI) values.
  • Methods provided for testing materials that are:
    • Self-supporting in the form of vertical bars or sheets up to 10.5 mm thick.
    • Solid, laminated, or cellular materials with apparent density ≥ 100 kg/m³.
    • Potentially applicable to some cellular materials with apparent density < 100 kg/m³.
  • A method is also provided for flexible sheets or film materials supported vertically during testing.
  • Includes a comparative procedure to determine if the OI of a material exceeds a specified minimum value

ISO 4589-3:201

  • Specifies methods for determining the minimum volume fraction of oxygen (in a nitrogen mixture) required to support combustion of small vertical specimens.
  • Applicable over a temperature range of 25 °C to 150 °C (typically 40 °C to 150 °C).
  • Results are expressed as temperature index values at the test temperature.
  • Useful for evaluating material behavior under overheated service conditions typical in practical applications.

 

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