StacksVerified U.S. regulatory reference

49 CFR §172.548

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Except for size and color, the DANGEROUS WHEN WET placard must be as follows:
  2. (b)In addition to complying with § 172.519, the background color on the DANGEROUS WHEN WET placard must be blue. The letters in the words “WHEN WET” must be at least 25 mm (1.0 inches) high. The symbol, text, class number and inner border must be white.