• SkillCat Team

Types of Refrigerant Blends

Updated: 2 days ago

EPA 608 Core Chapter 23 (Take full course for free)


In this module, we will dive deeper into the different types of refrigerant blends and discuss how they are used in HVAC practices. Skip to quiz!


1. Overview


Depending on what refrigerants were blended together, refrigerant blends can have different properties. Let’s take a look at a video that gives you a brief overview of this.


As mentioned in the video, there are two different types of refrigerant blends:

- Zeotropic Blends

- Azeotropic Blends



2. Zeotropic Blends


Zeotropic blends are mixtures of two or more refrigerants that have different boiling points. Recall that a boiling point is when something changes from liquid to gas.


This means that in a zeotropic blend, the components will boil and condense at different temperatures. The different refrigerants in the blend will act separately of each other.

Think of a pot of boiling water with oil. While the water is boiling, the oil is still in liquid form. This is what happens in a zeotropic blend.


R-407c is an example of a zeotropic blend that we commonly see. In general, all refrigerants with an ASHRAE number of 400 are zeotropic.


R-407c is a blend of all HFC refrigerants including:

- R-32

- R-125

- R-134a



3. Azeotropic Blends


Azeotropic blends are a mixture of two or more refrigerants that have the same boiling point. They will boil and condense at the same temperature.

In an azeotropic blend, the refrigerants will act like a single refrigerant.


R-502 is an example of an azeotropic blend that we commonly see.


R-502 is a blend of

- R-22 (HCFC)

- R-115 (CFC)






4. Conclusion


In this module, we discussed how were the different types of refrigerant blends developed.


Question #1: R-407c is an azeotropic blend.

  1. True

  2. False

Scroll down for the answer...











False! R-407c is a zeotropic blend.


Question #2: In a zeotropic blend, all refrigerants have the same boiling point.

  1. True

  2. False

Scroll down for the answer...











False! In an azeotropic blend, all refrigerants have the same boiling point.



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