UN1845 dry ice has no assigned packing group in the US hazardous materials table. Its Class 9 hazard classification is not Packing Group III. If a form asks for a packing group, follow the applicable instructions for an unassigned field rather than inventing I, II or III.
Read the dry-ice entry by column
49 CFR 172.101: hazardous materials table lists carbon dioxide, solid or dry ice as Class 9, identification number UN1845, with the packing-group field blank. These are separate fields. The entry also references packaging provisions, which should be read for the actual transport situation.
A blank packing-group field does not mean that dry ice is harmless or that no packing requirements apply. It means the entry does not assign a group. Avoid confusing that blank with information shown in another column.
Separate classification from packaging instructions
| Term | What it tells you |
|---|---|
| UN1845 | The identification number for solid carbon dioxide in this transport entry. |
| Proper shipping name | The permitted material description for the applicable rules. |
| Class 9 | The hazard class in the dry-ice entry. |
| Packing group | No group assigned in this entry. |
| Packaging provision | Requirements relevant to the material and transport mode. |
| Carrier acceptance | Conditions imposed for the selected service and shipment. |
Do not replace a packaging provision with a Roman numeral. A form, training slide or old article that associates all Class 9 materials with one group should be checked against the actual material entry.
Handle a mandatory software field correctly
- Confirm that the selected material is solid CO₂.
- Check the current applicable entry and transport mode.
- Use the system’s instructed handling of an unassigned group.
- Ask the carrier or responsible dangerous-goods specialist if the software forces a value.
- Keep the package and transport-data descriptions consistent.
- Record any correction to an incorrect saved template.
Do not select Packing Group III merely to make a booking screen accept the entry. A technical limitation in a form should be resolved through the supported workflow. It is not authority to alter the material classification.
Continue with the actual packing requirements
49 CFR 173.217: carbon dioxide, solid addresses applicable US dry-ice transport requirements, including gas release. Confirm the mode, contents and carrier acceptance, and establish whether other dangerous goods require separate classification or documentation.
Helpful decision tools
Check the details before you choose packaging
These quick tools can help you compare route risk, sizing needs, coolant choices, and packaging details before you request a quote.
Box Liner & Pallet Cover Sizing
Check box liner and pallet cover sizing logic for insulated packaging projects.
Estimate sizingDry Ice Calculator
Estimate dry ice needs for frozen or ultra-cold shipments before packing.
Estimate dry iceInsulation Material Drop Resistance
Review drop resistance and handling factors before choosing insulation materials.
Check resistanceThe coolant entry does not classify everything inside the parcel. A specimen, chemical or other regulated content can create additional obligations. Keep its assessment distinct from the dry-ice packing-group question.
Thermal performance is another separate check. Correct material identification does not prove that the product will remain within its temperature limits.
Frequently asked questions
Is Class 9 the same as Packing Group III?
No. They are different classification fields, and this dry-ice entry has no assigned packing group.
Should I type “None” into every shipping form?
Follow the applicable form and carrier instructions for an unassigned field; systems can use different formats.
Does no packing group mean no hazard label is ever needed?
No. Label and marking requirements depend on the applicable shipment rules and carrier conditions.
Complete the relevant transport path
Use the air-cargo marks and documents guide for preparation, and the dry-ice applicability guide to distinguish transport categories.
