Skip Top Navigation
Who We Are
Leadership
Financials
Government Relations
Judicial Officer
Legal
Our History
Postal Facts
What We're Doing
Strategic Planning
Current Initiatives
Securing The Mail
Sustainability
Corporate Social Responsibility
Government Services
Postal Customer Council
Service Performance Results
Newsroom
National News
Local News
Testimony & Speeches
Broadcast Downloads
Events Calendar
Photo Gallery
Service Alerts
Careers
Career Opportunities
Working at USPS
How to Apply
Profile Login
Doing Business with Us
Suppliers
Licensing
Rights & Permissions
Auctions
Public Key Infrastructure
Search
Poster 298 - Domestic Hazardous Materials Warning Labels and Markings - Contents
Poster 298 - Domestic Hazardous Materials Warning Labels and Markings
January 2021
PSN 7690-05-000-4227
Domestic Hazardous Materials Warning Labels and Markings
Always Prohibited in USPS® Networks
Permitted for Limited Quantity Mailings
Permitted in USPS Networks
Examples of Properly Prepared Mailpieces