Organic peroxide
Placard images are simplified study illustrations, NOT official placards. Always follow 49 CFR Part 172 and use approved placards.
- Hazard
- Organic compounds that are thermally unstable and may decompose violently.
- Identification
- Red top half, yellow bottom half.
- Driver study notes
- Type B, liquid or solid, temperature-controlled organic peroxides are Table 1 (any amount). Others are Table 2.
- Exam relevance
- Remember the Type B temperature-controlled exception.
- Regulation version
- 49 CFR Part 172 Subpart F (verify current eCFR)
Source: PHMSA — 49 CFR Part 172 — Hazardous Materials Table, Communications and Placarding. Updated: 2026-10-09