Dangerous when wet

Placard images are simplified study illustrations, NOT official placards. Always follow 49 CFR Part 172 and use approved placards.

Hazard

Materials that give off flammable or toxic gas when wet.

Identification

Blue placard.

Driver study notes

Table 1 — placard for any quantity.

Exam relevance

Table 1 material — any amount requires placards.

Regulation version

49 CFR Part 172 Subpart F (verify current eCFR)