Limiting Oxygen Index - ISO 4589-1,-2
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The minimum concentration of oxygen that will just support flaming combustion in a flowing mixture of oxygen and nitrogen. A specimen is positioned vertically in a transparent test column and a mixture of oxygen and nitrogen is forced upward through the column. The specimen is ignited at the top. The oxygen concentration is adjusted until the specimen just supports combustion. The concentration reported is the volume percent.
Procedures
| Procedure |
Description |
| A |
Top surface ignition. Igniter is used to initiate burning on the top surface of the specimen.
|
| B |
Propagating ignition. Igniter is used to initiate burning on the top surface and partially down the vertical face of the specimen. |
| C |
Used for verification purposes. |
Limiting Oxygen Index Test Configuration
Test Specimens
| Specimen |
Length (mm) |
Width (mm) |
Thickness (mm) |
Usage
|
| I |
80 to 150 |
10 |
4 |
Molding Materials |
| II |
80 to 150 |
10 |
10 |
Cellular Materials |
| III |
80 to 150 |
10 |
<10.5 |
Sheet Materials (as recieved) |
| IV |
70 to 150 |
6.5 |
3 |
Alternative size for molding or sheet materials. For electrical purposes.
|
| V |
140 |
52 |
10.5 |
Flexible Film or Sheet
|
| VI |
140 to 200 |
20 |
0.02 to 0.1 |
Thin Film (as recieved)
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ISO 10350 Note
ISO 10350 requires using Procedure A and a molded specimen measuring 80 mm x 10 mm x 4 mm (Type I) at ambient temperature.
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