# Materials listed as 'Forbidden' in the Hazardous Materials Table — Postal shipping restrictions by item category

For Materials listed as 'Forbidden' in the Hazardous Materials Table, carrier is US DOT (49 CFR, all modes); restriction type is prohibited; scope is transportation in commerce (US); conditions is A material whose hazard class entry is Forbidden may not be offered for transportation or transported, unless diluted, stabilized or incorporated in a device and classed per part 173, recorded from its source on 2026-08-10.

- **Item category:** Materials listed as 'Forbidden' in the Hazardous Materials Table _(verified: appears in the quote below)_
- **Carrier:** US DOT (49 CFR, all modes) _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** transportation in commerce (US) _(our reading, not quoted from the source)_
- **Conditions:** A material whose hazard class entry is Forbidden may not be offered for transportation or transported, unless diluted, stabilized or incorporated in a device and classed per part 173. _(verified: appears in the quote below)_

## What the source says

> A material for which the entry in this column is “Forbidden” may not be offered for transportation or transported. This prohibition does not apply if the material is diluted, stabilized or incorporated in a device and it is classed in accordance with the definitions of hazardous materials contained in

## Source

- https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-172/subpart-B

Last verified: 2026-08-10. Review by: 2027-08-10.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).