Refrigerant gas R 407B
HMT 15 June 2026- UN / ID
- UN 3339
- Hazard class
- 2.2
- Packing group
- —
- ERG guide
- ERG 126
- Special provisions
- Source
- 49 CFR §172 (15 June 2026)
Refrigerant gas R 407B
Refrigerants are working fluids that carry heat from a cold environment to a warm environment while circulating between them. For example, the refrigerant in an air conditioner carries heat from a cool indoor environment to a hotter outdoor environment. Similarly, the refrigerant in a kitchen refrigerator carries heat from inside the refrigerator out to the surrounding room. A wide range of fluids are used as refrigerants, with the specific choice depending on the temperature range needed and constraints related to the system involved Wikipedia
| Emergency Response Guide No. 126 |
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard class2.2Non-toxic, non-flammable gases |
(4) Identification number |
(5) Packing Group |
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(6) Labels |
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(7) Special Provisions (§172.102)
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| T50 |
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(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 306 | see 49 CFR §173.306 |
|---|---|---|
| (8B) Non-bulk | 304 | see 49 CFR §173.304 |
| (8C) Bulk | 314, 315 | see 49 CFR §173.314, 315 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 75 kg |
|---|---|
| (9B) Cargo aircraft only | 150 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other | — |
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
Full segregation table for class 2.2 · Browse UN entries for this class
| Hazard class | 8![]() | 7![]() | 6.1![]() | 5.2![]() | 5.1![]() | 4.3![]() | 4.2![]() | 4.1![]() | 3![]() | 2.3B![]() | 2.3A![]() | 2.2![]() | 2.1![]() | 1.6![]() | 1.5![]() | 1.4![]() | 1.3![]() | 1.1/1.2![]() |
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3 ![]() | ||||||||||||||||||
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7 ![]() | ||||||||||||||||||
8 ![]() |
| Must not be loaded, transported, or stored together in the same vehicle or facility. | |
| May be loaded, transported, or stored together. | |
| May be loaded, transported, or stored together only with restrictions. |