ISO 4589-4:2021
Plastics — Determination of burning behaviour by oxygen index — Part 4: High gas velocity test
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.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles for determination of HOI
5 Apparatus
6 Calibration of equipment
7 Preparation of test specimens
7.1 Test specimen form
7.2 Sampling
7.3 Test specimen dimensions and preparation
7.4 Marking of test specimen
7.5 Conditioning
8 Procedure for determination of HOI
8.1 Setting up the apparatus
8.2 Setting volume fraction of oxygen and gas flow velocity
8.3 Procedure for ignition of the test specimen
8.4 Assessing the burning behaviour of test specimen
8.5 Selecting successive volume fraction of oxygen
8.6 Determining the preliminary volume fraction of oxygen
8.7 Volume fraction of oxygen changes
9 Calculation and expression of results
9.1 Calculation of the HOI
9.2 Determination of k
9.3 Standard deviation of oxygen volume fraction measurements
10 Precision of test results
11 Test report
Annex A (normative) Calibration of equipment
Annex B (informative) Example of test results sheet for HOI
Annex C (informative) Interlaboratory test data on HOI measurement
Annex D (informative) Blow-off behaviour at high gas velocity — How to predict the flammability of materials
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles for determination of HOI
5 Apparatus
6 Calibration of equipment
7 Preparation of test specimens
7.1 Test specimen form
7.2 Sampling
7.3 Test specimen dimensions and preparation
7.4 Marking of test specimen
7.5 Conditioning
8 Procedure for determination of HOI
8.1 Setting up the apparatus
8.2 Setting volume fraction of oxygen and gas flow velocity
8.3 Procedure for ignition of the test specimen
8.4 Assessing the burning behaviour of test specimen
8.5 Selecting successive volume fraction of oxygen
8.6 Determining the preliminary volume fraction of oxygen
8.7 Volume fraction of oxygen changes
9 Calculation and expression of results
9.1 Calculation of the HOI
9.2 Determination of k
9.3 Standard deviation of oxygen volume fraction measurements
10 Precision of test results
11 Test report
Annex A (normative) Calibration of equipment
Annex B (informative) Example of test results sheet for HOI
Annex C (informative) Interlaboratory test data on HOI measurement
Annex D (informative) Blow-off behaviour at high gas velocity — How to predict the flammability of materials
Bibliography