---
type: restriction
id: usps-safety-fuses-un0105-division-1-4s
asset: shipping-restrictions-by-class
title: "Safety Fuses (UN0105, Division 1.4S) — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c3_020.htm
source_quote: "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"
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "Safety Fuses (UN0105, Division 1.4S)"
carrier: "USPS"
restriction_type: "restricted"
scope: "domestic surface transportation only"
conditions: "Mailable only with prior written approval from director, Product Classification; must be prepared per Packaging Instruction 1B; shipping paper required"
verified: false
unverified_fields: carrier, conditions, item_category, scope
---
**Item category:** Safety Fuses (UN0105, Division 1.4S)

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic surface transportation only

**Conditions:** Mailable only with prior written approval from director, Product Classification; must be prepared per Packaging Instruction 1B; shipping paper required

> 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>