UN1017: Chlorine
UN1017 appears 1 time in the Hazardous Materials Table (49 CFR §172.101). Hazard class 2.3.
All §172.101 entries for UN1017
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Chlorine | 2.3 | — | 2.3, 5.1, 8 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Label codes (column 6): 2.3, 5.1, 8 → Poison gas label + subsidiary Oxidizer, Corrosive labels.
UN numbers are recognized for international and domestic transport.
Reportable quantity (RQ)
- Chlorine is listed in Appendix A with an RQ of 10 lb (4.54 kg).
If a single package contains the RQ or more, the material is also a hazardous substance and “RQ” is added to the shipping description. How RQ is measured →
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 UN1017 in the current PHMSA Emergency Response Guidebook.
Get the HazmatTable Field Guide poster pack
8 printable hazmat reference posters — reading a table entry, hazard classes, placards, segregation, shipping papers and more. Free, sent to your inbox.
Common questions about UN1017
What is UN1017?
UN1017 is the identification number for Chlorine in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN1017?
UN1017 is listed under hazard class 2.3 (poisonous (toxic) gas).
What packing group is UN1017?
Packing group for UN1017: not assigned. Where several rows exist, the packing group that fits your material decides which row applies.