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USPS Packaging Instruction 8A

Corrosives

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

Mailability

Required Packaging

Separate packaging requirements apply for liquids and solids.