ISO 4589-4:2021 PDF

Scope: This document specifies a test method for determining the minimum volume fraction of oxygen, in admixture with nitrogen, at ambient temperature, that supports combustion of small vertical sheet test specimen under a specified gas velocity that is higher than that specified in ISO 4589-2. NOTE The result is expressed as a high gas velocity oxygen index (HOI). In addition, this document specifies the testing apparatus for determining the HOI. The test method is applicable to materials in the form of sheets up to 2 mm thick. It is also applicable to flexible sheet materials that are supported vertically by a specified specimen holder.

ISO 4589-4:2021 Referenced Document

ISO 13943 Fire safety — Vocabulary*， 2023-09-01 Update
ISO 2859-1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection; Technical Corrigendum 1
ISO 2859-2 Sampling procedures for inspection by attributes — Two-stage sampling plans for auditing and for inspection under prior information
ISO 291:2008 Plastics - Standard atmospheres for conditioning and testing

2021 ISO 4589-4:2021 Plastics - Determination of burning behaviour by oxygen index - Part 4: High gas velocity test