# Trichloroisocyanuric acid, dry — Postal shipping restrictions by item category

For Trichloroisocyanuric acid, dry, carrier is USPS; restriction type is restricted; scope is domestic mail (air and surface); conditions is Hazard class 5.1, UN2468, packing group II; domestic mail air: 5A; domestic mail surface: 5A, recorded from its source on 2026-08-10.

- **Item category:** Trichloroisocyanuric acid, dry _(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, UN2468, packing group II; domestic mail air: 5A; domestic mail surface: 5A _(verified: appears in the quote below)_

## What the source says

> Trichloroisocyanuric acid, dry 5.1 UN2468 II 5A 5A

## Source

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

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/).