UN1973: Chlorodifluoromethane and…
As listed: Chlorodifluoromethane and chloropentafluoroethane mixture or Refrigerant gas R 502 with fixed boiling point, with approximately 49 percent chlorodifluoromethane
UN1973 appears 1 time in the Hazardous Materials Table (49 CFR §172.101). Hazard class 2.2.
All §172.101 entries for UN1973
| Proper shipping name | Class | PG | Labels |
|---|---|---|---|
| Chlorodifluoromethane and chloropentafluoroethane mixture or Refrigerant gas R 502 with fixed boiling point, with approximately 49 percent chlorodifluoromethane | 2.2 | — | 2.2 |
Open any entry for packaging sections, special provisions, air limits and vessel stowage.
What it means
Label codes (column 6): 2.2 → Non-flammable gas label.
UN numbers are recognized for international and domestic transport.
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 UN1973 in the current PHMSA Emergency Response Guidebook.
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Common questions about UN1973
What is UN1973?
UN1973 is the identification number for Chlorodifluoromethane and chloropentafluoroethane mixture or Refrigerant gas R 502 in the DOT Hazardous Materials Table (49 CFR §172.101).
What hazard class is UN1973?
UN1973 is listed under hazard class 2.2 (non-flammable, non-poisonous gas).
What packing group is UN1973?
Packing group for UN1973: not assigned. Where several rows exist, the packing group that fits your material decides which row applies.