(a) Summary of test method. Conditioned specimens are suspended one at a time vertically in holders in a prescribed cabinet and subjected to a standard flame along their bottom edges for a specified time under controlled conditions. The char lengths are recorded.

(b) Test criteria. The test criteria when the testing is done in accordance with §1616.4 Sampling and acceptance procedures and §1616.5 Test procedures are:

(1) Average char length. The average char length of five specimens shall not exceed 17.8 cm. (7.0 in.).

(2) Full-specimen burn. No individual specimen shall have a char length of 25.4±0.5 cm. (10±0.2 in.).

(c) Details of the number of specimens which must meet the above test criteria for unit acceptance is specified in §1616.4.