1.1This fire-test-response standard describes a procedure for measuring the minimum concentration of oxygen, expressed as percent volume, that will just support flaming combustion in a flowing mixture of oxygen and nitrogen.

1.2This test method provides three testing procedures. Procedure A involves top surface ignition, Procedure B involves propagating ignition, and Procedure C is a short procedure involving the comparison with a specified minimum value of the oxygen index.

1.3Test specimens used for this test method are prepared into one of six types of specimens (see Table 1).

Test Specimen Type^A		Dimensions			Material Form
Test Specimen Type^A		Length, mm	Width, mm	Thickness, mm	Material Form
	I	80 to 150	10 ± 0.5	4 ± 0.25	for molding materials
	II	80 to 150	10 ± 0.5	10 ± 0.5	for cellular materials
	III^B	80 to 150	10 ± 0.5	≤ 10.5	for sheet materials
	IV	70 to 150	6.5 ± 0.5	3 ± 0.25	alternative size for self-supporting molding or sheet materials
	V^B	140 ± 5	52 ± 0.5	≤10.5	for flexible film or sheet
	VI^B,^C	140 to 200	20	0.02 to 0.10	for thin film; limited to film that can be rolled by the wire specified in 6.7

(A)Test specimens of Types I, II, III, and IV are suitable for materials that are self-supporting at these dimensions. Test specimens of Form V and VI are suitable for materials that require support during testing. Test specimens of Form VI are suitable for film materials that can be rolled into a self-supporting specimen by the procedure in 7.4.

(B)Compare results obtained using Type III, V, and VI test specimens only to those obtained using specimens of the same form and thickness. It is assumed that the amount of variation in thickness for such materials will be controlled by other standards.

(C)The test specimen of Type VI is suitable for thin film that is self-supporting when it is rolled (see 7.4). Dimensions in the table are of the specimen size from which the rolled form is made. If the film is very thin, it is possible that proper results will only be obtained if two or more layers are combined in the preparation of the roll to obtain proper results.