49 CFR Part 172, Appendix B to Part 172 - Trefoil Symbol
Appendix B to Part 172—Trefoil Symbol
1. Except as provided in paragraph 2 of this appendix, the trefoil symbol required for RADIOACTIVE labels and placards and required to be marked on certain packages of Class 7 materials must conform to the design and size requirements of this appendix.
2. RADIOACTIVE labels and placards that were printed prior to April 1, 1996, in conformance with the requirements of this subchapter in effect on March 30, 1996, may continue to be used.
1=Radius of Circle—
4 mm (0.16 inch) for markings and labels
12.5 mm (0.5 inch) for placards
3=5 radii for markings and labels
41/2 radii for placards.
[60 FR 50306, Sept. 28, 1995, as amended by 172-143, 61 FR 20750, May 8, 1996]
Title 49 published on 2014-10-01
no entries appear in the Federal Register after this date.