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Status : Active
Standard Type : Main
Document No : ISO 4589-4:2021
Document Year : 2021
Pages : 29
Edition : 1
Section Volume : Burning behaviour (ISO/TC 61/SC 4.)
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.