NA9191: Chlorine dioxide, hydrate, frozen
NA9191 appears 1 time in the Hazardous Materials Table (49 CFR §172.101). Hazard class 5.1, packing group II.
All §172.101 entries for NA9191
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Chlorine dioxide, hydrate, frozen | 5.1 | II | 5.1, 6.1 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Packing group ranks danger within the class: PG II = medium danger.
Label codes (column 6): 5.1, 6.1 → Oxidizer label + subsidiary Poison / Toxic label.
NA numbers are North-America-only identification numbers — not recognized for international transport except to and from Canada.
Example basic description
Proper shipping name shown without the table's italic descriptive text. Order per §172.202: ID number, proper shipping name, hazard class, packing group. Example only — add technical names, “RQ”, quantities and other elements your shipment requires.
What to check next
- Match the name. Compare your SDS Section 14 to the proper shipping names above and pick the row with your packing group.
- Read the special provisions on the entry page (§172.102) — they can add limits or exceptions.
- Check packaging — the entry page lists the Part 173 sections for exceptions, non-bulk and bulk.
- Labels & placards. Placarding depends on class and quantity — see Table 1 vs Table 2.
- Emergency response. Find the response guide for NA9191 in the current PHMSA Emergency Response Guidebook.
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Common questions about NA9191
What is NA9191?
NA9191 is the identification number for Chlorine dioxide, hydrate, frozen in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is NA9191?
NA9191 is listed under hazard class 5.1 (oxidizer).
What packing group is NA9191?
Packing group for NA9191: II. Where several rows exist, the packing group that fits your material decides which row applies.