ASTM D2863-17 PDF

1.1 This 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.

1.2 This 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.

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

Test Specimen TypeA

Dimensions

Material Form

Length,
mm

Width,
mm

Thickness, mm

 

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

 

IIIB

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

 

VB

140 ± 5

52 ± 0.5

≤10.5

for flexible film or sheet

 

VIB, 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.

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Published :	08/15/2017
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