# Biological products or medical preparations in nonrefillable metal containers — Postal shipping restrictions by item category

For Biological products or medical preparations in nonrefillable metal containers, carrier is USPS; restriction type is restricted; scope is domestic surface mail only; conditions is Nonflammable solutions accepted for domestic surface mail only if they comply with Packaging Instruction 2F, recorded from its source on 2026-08-04.

- **Item category:** Biological products or medical preparations in nonrefillable metal containers
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** domestic surface mail only _(our reading, not quoted from the source)_
- **Conditions:** Nonflammable solutions accepted for domestic surface mail only if they comply with Packaging Instruction 2F _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Biological Products or Medical Preparations: Nonflammable solutions containing biological or medical products in nonrefillable metal containers preparation that heat could deteriorate may be accepted for domestic surface mail only

## Source

- https://pe.usps.com/text/pub52/pub52c3_021.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/).