USPS Packaging Instruction 8A


A corrosive is any liquid or solid that causes visible destruction or irreversible alteration in human skin tissue at the site of contact or a liquid that has a severe corrosion rate on steel.

A Class 8 corrosive material that qualifies as a mailable limited quantity or ORM-D material is permitted in domestic mail provided that all applicable requirements in 348 are met.

Proper Shipping Name

ID Number


Required Packaging

Separate packaging requirements apply for liquids and solids.