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BS ISO 4589-4:2021

BS ISO 4589-4:2021

$167.15

Plastics. Determination of burning behaviour by oxygen index – High gas velocity test

Published By Publication Date Number of Pages
BSI 2021 38
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Principles for determination of HOI
5 Apparatus
15 6 Calibration of equipment
7 Preparation of test specimens
7.1 Test specimen form
16 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
17 8.2 Setting volume fraction of oxygen and gas flow velocity
8.3 Procedure for ignition of the test specimen
18 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
19 9 Calculation and expression of results
9.1 Calculation of the HOI
20 9.2 Determination of k
21 9.3 Standard deviation of oxygen volume fraction measurements
10 Precision of test results
11 Test report
22 Annex A (normative) Calibration of equipment
23 Annex B (informative) Example of test results sheet for HOI
26 Annex C (informative) Interlaboratory test data on HOI measurement
28 Annex D (informative) Blow-off behaviour at high gas velocity — How to predict the flammability of materials
37 Bibliography

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BS ISO 4589-4:2021
$167.15