Many household items can’t go in the mail.
Hazardous materials come in a wide variety of forms and can be chemical, biological, radioactive, or a combination.
The Postal Service's™ definition of a hazardous material includes many common household and consumer products. They may not be dangerous on your shelf at home, but they can become a hazard when shaken or when the temperature or pressure changes.
Some common hazardous materials include…
Flea collars or flea sprays
Fuels or gasoline
Items previously containing fuel
Not sure if what you’re sending is hazardous or prohibited? Just call 1-800-ASK-USPS or your local Post Office.
I know for a fact it would be against US Postal laws to send any inflammable or combustible materials through the mail unless you are using a pre-approved fire-retardant, airtight shipper.
I don't know what the regulations are with Fed-Ex or UPS but they probably wouldn't knowingly let you mail them unless they were in the same type of fire-retardant, airtight shipping container.
The companies that manufacture spray paints use these types of containers to ship their paints, usually by overland freight.
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