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

For Guanidine nitrate · USPS, item category is Guanidine nitrate; carrier is USPS; restriction type is restricted; scope is domestic mail (air and surface); conditions is Hazard class 5.1, UN1467, packing group III; domestic mail air: 5A; domestic mail surface: 5A, recorded from its source on 2026-08-30.

- **Item category:** Guanidine nitrate _(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 5.1, UN1467, packing group III; domestic mail air: 5A; domestic mail surface: 5A

## What the source says

> Guanidine nitrate 5.1 UN1467 III 5A 5A

## 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/).