The rate of burning shall not exceed 1.2 in./sec as judged by the average of five determinations lengthwise and five determinations transverse to the direction of processing, when the material is tested with the SPI flammability tester in accordance with the method described in § 1611.4.
source: 40 FR 59898, Dec. 30, 1975, unless otherwise noted.
cite as: 16 CFR 1611.3