Limiting Oxygen Index - ISO 4589-1 & ISO 4589-2

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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)

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.

Similar Standards

ASTM D2863

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