---
type: restriction
id: usps-liquid-mercury
asset: shipping-restrictions-by-class
title: "Liquid Mercury — Postal shipping restrictions by item category"
sources:
  - https://www.usps.com/ship/shipping-restrictions.htm
source_quote: "Liquid mercury in any amount (and devices containing a visible amount of mercury) is prohibited from the US Mail, so you must find another carrier."
generated: true
harvested: 2026-08-03
stale_after: 2027-08-03
item_category: "Liquid Mercury"
carrier: "USPS"
restriction_type: "prohibited"
scope: "US Mail"
conditions: "you must find another carrier"
verified: true
unverified_fields: carrier
---
**Item category:** Liquid Mercury

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** US Mail

**Conditions:** you must find another carrier

> Liquid mercury in any amount (and devices containing a visible amount of mercury) is prohibited from the US Mail, so you must find another carrier.

Source: <https://www.usps.com/ship/shipping-restrictions.htm>