---
kind: "section"
citation: "16 C.F.R. § 1616.3"
title: "16"
number: "1616.3"
heading: "General requirements."
url: "https://uscodex.org/cfr/16/1616.3"
---

# §1616.3. General requirements.

- (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](/cfr/16/1616.4.md) Sampling and acceptance procedures and [§ 1616.5](/cfr/16/1616.5.md) 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](/cfr/16/1616.4.md).

## Notes

### Authority

Authority: Sec. 429, Pub. L. 105-276; Sec. 4, 67 Stat. 112, as amended, 81 Stat. 569-570; 15 U.S.C. 1193.

### Source

Source: 40 FR 59917, Dec. 30, 1975, unless otherwise noted.