Air Transportation. Most mailable hazardous materials must be accompanied by a shipper’s declaration for dangerous goods (shipping paper). To determine which mailable hazardous materials require a shipping paper when sent via air transportation, refer to the appropriate sections in this chapter and the appropriate Packaging Instruction in Appendix C.
Surface Transportation. Certain mailable hazardous material may require a properly prepared shipping paper. To determine which mailable hazardous materials require a shipping paper when sent via surface transportation, refer to the appropriate sections in this chapter, and the appropriate Packaging Instruction in Appendix C.