# Benzaldehyde · USPS — Mailing and air-carriage restrictions by item category

For Benzaldehyde · USPS, item category is Benzaldehyde; carrier is USPS; restriction type is restricted; scope is domestic mail (air and surface); conditions is Hazard class 9, UN1990, packing group III; domestic mail air: 9C; domestic mail surface: 9C, recorded from its source on 2026-08-30.

- **Item category:** Benzaldehyde _(verified: appears in the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** domestic mail (air and surface) _(our reading, not quoted from the source)_
- **Conditions:** Hazard class 9, UN1990, packing group III; domestic mail air: 9C; domestic mail surface: 9C

## What the source says

> Benzaldehyde 9 UN1990 III 9C 9C

## Source

- https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf

Last verified: 2026-08-30. Review by: 2027-08-30.
Part of [Mailing and air-carriage restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).