# Calcium carbide · USPS · II — Mailing and air-carriage restrictions by item category

For Calcium carbide · USPS · II, item category is Calcium carbide; carrier is USPS; dot packing group is II; restriction type is restricted; scope is domestic mail: surface only (air prohibited), recorded from its source on 2026-08-29.

- **Item category:** Calcium carbide _(verified: appears in the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **DOT packing group:** II _(verified: appears in the quote below)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** domestic mail: surface only (air prohibited) _(our reading, not quoted from the source)_
- **Conditions:** Hazard class 4.3, UN1402, packing group II; domestic mail air: Prohibited; domestic mail surface: 4A

## What the source says

> Calcium carbide 4.3 UN1402 II Prohibited 4A

## Source

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

Last verified: 2026-08-29. Review by: 2027-08-29.
Part of [Mailing and air-carriage restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).