Which DOT hazard classification applies to cylinders of common refrigerants such as R-22 or R-134a?
Shipping · EPA 608 Core. The correct answer, and the reasoning behind it.
Labels and DOT classification for refrigerant cylinders.
The question
Which DOT hazard classification applies to cylinders of common refrigerants such as R-22 or R-134a?
- Corrosive material
- Flammable liquid
- Nonflammable gasCorrect answer
- Poison gas
Why “Nonflammable gas” is correct
Common A1 refrigerants such as R-22, R-134a and R-410A ship under the DOT nonflammable gas classification (Division 2.2). The cylinder must carry that classification tag along with the refrigerant name.
Source: EPA: Test Topics
Why the other answers are wrong
- Corrosive material — They are not shipped as corrosives.
- Flammable liquid — These refrigerants are shipped as compressed gases, not flammable liquids.
- Poison gas — They are not classed as poison gases.
Practice more of this
More EPA 608 Core practice questions, or see every EPA 608 practice test.
Unofficial, not affiliated with the EPA or any EPA-approved certifying organization. Questions are original practice written from public EPA material, not real exam questions.