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BS EN ISO 4589-2 · ASTM D2863

Oxygen Index — OI

Measures the minimum percentage of oxygen in a test atmosphere required to marginally support combustion.

Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-temperature test; ASTM D2863: Standard test method for measuring the minimum oxygen concentration to support candle-like combustion of plastics (oxygen index)

Oxygen Index apparatus test equipment

Test overview

The Oxygen Index (OI) measures the minimum percentage of oxygen in a test atmosphere that is required to marginally support combustion. The OI is an economical and precise quality control test of combustible materials. Its ease of use together with high levels of precision has made this technique a primary characterising and quality control tool for the plastic and electric cable industries, and it has been specified by several military and transport groups.

Our apparatus enables the oxygen index to be determined in accordance with ASTM D2863, ISO 4589 Part 2 or the UK Naval Engineering Standard NES 714.

Sample requirements

Sample dimensions, quantities, mounting, substrate and conditioning requirements for this test are confirmed with you before testing begins. Contact our technical team for the sample requirements for your product.

Equipment and outputs

Equipment used
Oxygen Index apparatus
Reported measurements
Oxygen index (%)

Related tests

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