# Hydrofluoric acid (UN1790) — Postal shipping restrictions by item category

For Hydrofluoric acid (UN1790), carrier is USPS; restriction type is prohibited; scope is all mail; conditions is Nonmailable corrosive, recorded from its source on 2026-08-04.

- **Item category:** Hydrofluoric acid (UN1790)
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** all mail _(our reading, not quoted from the source)_
- **Conditions:** Nonmailable corrosive _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Hydrofluoric Acid (UN1790).

## Source

- https://pe.usps.com/text/pub52/pub52c3_027.htm

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).