Postal Explorer > Publication 52 - Hazardous, Restricted, and Perishable Mail > Appendix C USPS Packaging Instructions for Mailable Hazardous Materials

Appendix C
USPS Packaging Instructions for Mailable Hazardous Materials

These Postal Service packaging instructions are for mailable types of hazardous materials. The numeric digits 1 through 9 correspond to the appropriate hazard class. The alpha characters differentiate the separate groups of materials within a hazard class. Packaging instruction 10A is for the small quantity provision cited in 334. Postal Service packaging instructions are provided as follows:

Hazard Class 1: Explosives

• 1A Toy Propellant Devices

• 1B Safety Fuses

Hazard Class 2: Gases

• 2A Flammable Gases

• 2B Nonflammable Gases

• 2C Fire Extinguishers

• 2D Foodstuffs and Soap Products

• 2E Audible Fire Alarm Systems

• 2F Biological Products or Medical Preparations

Hazard Class 3: Flammable and Combustible Liquids

• 3A Flammable Liquids

• 3B Combustible Liquids

• 3C Cigarette Lighters

Hazard Class 4: Flammable Solids

• 4A Flammable Solids

• 4B Safety Matches

Hazard Class 5: Oxidizing Substances, Organic Peroxides

• 5A Oxidizing Substances and Organic Peroxides

Hazard Class 6: Toxic Substances and Infectious Substances

• 6A Toxic Substances

• 6B Toxic Substances with LD50 Oral Toxicity of 50 mg/kg or Less

• 6C Infectious Substances (Etiologic Agents)

• 6D Diagnostic (Clinical) Specimens

• 6E Sharps Waste and Other Regulated Medical Waste

• 6F Used Healthcare Products

• 6G Forensic Material

• 6H Risk Group 1 Materials

Hazard Class 7: Radioactive Materials

• 7A Radioactive Materials

Hazard Class 8: Corrosives

• 8A Corrosives

• 8B Nonspillable Wet Battery

Hazard Class 9: Miscellaneous Hazardous Materials

• 9A Dry Ice (Carbon Dioxide Solid)

• 9B Magnetized Materials

• 9C Miscellaneous Hazardous Materials

Category 10: Other Packaging Instructions

• 10A Small Quantity Provision