# Safety Fuses (UN0105, Division 1.4S) — Postal shipping restrictions by item category

For Safety Fuses (UN0105, Division 1.4S), carrier is USPS; restriction type is restricted; scope is domestic surface transportation only; conditions is Mailable only with prior written approval from director, Product Classification; must be prepared per Packaging Instruction 1B; shipping paper required, recorded from its source on 2026-08-04.

- **Item category:** Safety Fuses (UN0105, Division 1.4S) _(unconfirmed — we could not tie this to the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** domestic surface transportation only _(our reading, not quoted from the source)_
- **Conditions:** Mailable only with prior written approval from director, Product Classification; must be prepared per Packaging Instruction 1B; shipping paper required _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Safety Fuses (UN0105): Consists of a black powder core over-spun with yarns, waterproofing compounds, and/or tapes. Safety fuses identified as UN0105 and classified as Division 1.4S are mailable only when prior written approval has been granted by the director, Product Classification

## Source

- https://pe.usps.com/text/pub52/pub52c3_020.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/).