EPA 608 Core · Substitute Refrigerants & Oils · Hard
What oil is most commonly used in ternary blends containing HCFCs?
Answer: A. Alkylbenzene (AB).
- AAlkylbenzene (AB).✓ Correct
- BPolyalkylene Glycol (PAG).
- CMineral oil.
- DPolyolester (POE).
Why A is right
Ternary blends that contain HCFCs, such as R-401A and R-409A, use alkylbenzene (AB), a synthetic lubricant that also mixes with the mineral oil left in older systems. Polyolester (POE) goes with HFCs, and glycol (PAG) with automotive R-134a.
More Core questions
- Which refrigerant is approved as an exempt substitute for new household fridges?
- Which type of oil is most commonly used with HFC refrigerants?
- Which oil is primarily used in automotive HFC-134a AC systems?
- Which oil was historically the standard for CFC refrigerants?
- What does 'hygroscopic' mean regarding refrigeration oils?
Go deeper with the study guide A2L Refrigerants and the R-410A Transition: A Tech’s Guide, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.