# Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxide — Postal shipping restrictions by item category

For Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxide, carrier is USPS; restriction type is restricted; scope is domestic mail (air and surface); conditions is Hazard class 2.2, UN3299, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B, recorded from its source on 2026-08-10.

- **Item category:** Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxide _(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 2.2, UN3299, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B _(verified: appears in the quote below)_

## What the source says

> Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxide 2.2 UN3299 n/a 2B 2B

## 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/).