science

R-454B

R-454B is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand R-454B rather than just read about it. In short: R-454B, also known by the trademarked names Opteon XL41, Solstice 454B, and Puron Advance, is a zeotropic blend of 68.9 percent difluoromethane (R-32), a hydrofluorocarbon, and 31.1 percent 2,3,3,3-tetrafluoropropene (R-1234yf), a hydrofluoroolefin. Because of its reduced global warming potential (GWP), R-454B is intended to be an alternative to refrigerant R-410A in new equipment.

Key takeaways

R-454B belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect R-454B to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of R-454B from memory before moving on to harder problems.

Reference excerpt

R-454B, also known by the trademarked names Opteon XL41, Solstice 454B, and Puron Advance, is a zeotropic blend of 68.9 percent difluoromethane (R-32), a hydrofluorocarbon, and 31.1 percent 2,3,3,3-tetrafluoropropene (R-1234yf), a hydrofluoroolefin. Because of its reduced global warming potential (GWP), R-454B is intended to be an alternative to refrigerant R-410A in new equipment. R-454B has a GWP of 466, which is 78 percent lower than R-410A's GWP of 2088. R-454B is non-toxic and mildly flammable, with an ASHRAE safety classification of A2L. In the United States, it is expected to be packaged in a container that is red or has a red band on the shoulder or top. These containers are supplied with a left-hand thread valve to prevent cross-contamination. There is a shortage of R-454B in the United States as of May 2025.

History The refrigeration industry has been seeking replacements for R-410A because of its high global warming potential. R-454B, formerly known as DL-5A, has been selected by several manufacturers. R-454B was developed at and is manufactured by Chemours. Carrier first announced introduction of R-454B in ducted residential and light commercial packaged refrigeration and air conditioning products in 2018, with R-454B-based products launches starting in 2023.

Physical & Thermodynamic Properties

Operating pressures are generally similar to (or slightly lower than) R-410A, which allows relatively straightforward adaptation of existing equipment designs. Capacity and efficiency are typically close to or slightly better than R-410A in properly designed systems.

Related refrigerants R-454B is not the only blend of R-32 and R-1234yf to be proposed as a refrigerant. Other blends include R-454A (35 percent R-32, 65 percent R-1234yf) and R-454C (21.5 percent R-32, 78.5 percent R1234yf). There are also several blends that include a third component.

See also R-410A, a refrigerant that is being phased out in some countries, and which R-454B is a popular replacement for Difluoromethane, R-32, another R-410A replacement List of refrigerants

References

Worked examples

Example 1 — a first encounter with R-454B

Start with the simplest possible case. Write down what R-454B claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to R-454B before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about R-454B ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of R-454B

In research: R-454B appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses R-454B in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: R-454B is common in secondary-school and first-year university syllabi. It links to neighbouring topics Daikin, Greenhouse gases, Refrigerants, so understanding it makes those chapters shorter.
In everyday life: Look for R-454B outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study R-454B in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what R-454B means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain R-454B out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is R-454B in simple terms?

Why does R-454B matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study R-454B?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on R-454B.