R1336mzz(Z) RefrigerantUltra-low-GWP A1 fluid · low-pressure chiller and industrial thermal applications
R1336mzz(Z) is an ultra-low-GWP, nonflammable HFO fluid used in specialized thermal applications rather than mainstream comfort cooling. It is most relevant in low-pressure chillers, industrial process air conditioning, and advanced thermal systems such as high-temperature heat pumps or organic Rankine cycle platforms. For refrigerants.net, it is valuable because it extends the site beyond common refrigerants into engineered, low-pressure next-generation fluids.
What is R1336mzz(Z) refrigerant?
The most important point about R1336mzz(Z) is context. It is not a drop-in for everyday split AC systems. Its value comes from combining A1 safety with a very low current EPA GWP reference of 2. EPA SNAP listings made it notable in centrifugal chillers and industrial process air conditioning, while other industry literature discusses heat transfer, ORC and high-temperature heat pumps. A good page should therefore explain where it fits technically, not merely list a few numbers.
R1336mzz(Z) is an ultra-low-GWP, nonflammable HFO fluid used in specialized thermal applications rather than mainstream comfort cooling. It is most relevant in low-pressure chillers, industrial process air conditioning, and advanced thermal systems such as high-temperature heat pumps or organic Rankine cycle platforms. For refrigerants.net, it is valuable because it extends the site beyond common refrigerants into engineered, low-pressure next-generation fluids.
R1336mzz(Z) technical properties
Core reference data and selection notes for R1336mzz(Z) based on the positioning used in this page.
| Designation | HFO-1336mzz(Z) | Industry fluid designation |
|---|---|---|
| Chemical family | HFO | Hydrofluoroolefin |
| Refrigerant type | Pure refrigerant | No blend glide |
| ODP | 0 | No ozone depletion potential |
| 100-year GWP | 2 | EPA Technology Transitions current reference |
| Older SNAP table references | 9 | Appears in older EPA SNAP listings |
| Safety classification | A1 | Nonflammable / lower toxicity |
| Normal boiling point | ≈ 7.5°C | Useful for low-pressure thermal applications |
| Typical pressure class | Low-pressure refrigerant / thermal fluid | Not a normal direct-expansion comfort AC fluid |
| Primary positioning | Low-pressure chiller / thermal system fluid | Specialized engineered applications |
Where R1336mzz(Z) is used
These are the most relevant application contexts for R1336mzz(Z) in practical HVACR and thermal-system discussions.
Low-pressure centrifugal chillers
EPA SNAP listed HFO-1336mzz(Z) as acceptable in new centrifugal chillers.
Industrial process air conditioning
EPA also lists it in industrial process air conditioning, highlighting broader thermal use beyond chillers.
High-temperature heat pumps
Industry literature often positions it as a high-temperature, low-pressure working fluid.
Organic Rankine cycle systems
It is frequently evaluated for waste-heat recovery and ORC system design.
Heat transfer / specialty thermal systems
Some commercial literature discusses broader thermal-management or heat-transfer use.
Advanced low-GWP equipment development
It is useful where A1 safety and ultra-low GWP are both important design priorities.
Detailed analysis
Why R1336mzz(Z) is important even though it is not a mass-market refrigerant
Many databases focus almost entirely on familiar gases such as R410A, R32, R134a and supermarket blends. R1336mzz(Z) adds real technical depth because it belongs to a different category of refrigerant use: low-pressure, engineered thermal systems.
That makes it especially useful for GEO and high-intent search. Readers searching for it are usually evaluating an actual application or comparing next-generation working fluids, not looking for a beginner-level consumer answer.
A dedicated profile helps refrigerants.net cover advanced chiller and thermal-system topics more credibly.
Why the current GWP number needs context
Older EPA SNAP pages commonly show R1336mzz(Z) with a GWP of 9, while the newer EPA Technology Transitions reference table shows a current 100-year GWP of 2.
This is not necessarily a contradiction so much as a change in reference basis and regulatory source. The best practice is to present the current EPA reference value clearly while noting that older SNAP tables may show a higher historical number.
That kind of nuance increases technical trust and prevents confusion when readers compare documents.
R1336mzz(Z) vs mainstream chiller alternatives
R1336mzz(Z) belongs in the same conversation as R1224yd(Z), R1233zd(E), R514A and legacy R123, but it does not mean all of those fluids are interchangeable.
Selection depends on compressor architecture, pressure level, safety classification, thermodynamic fit, material compatibility and the owner’s regulatory strategy.
The practical value of a profile page is to explain this selection context instead of pretending there is one universal “best” refrigerant.
Why A1 still matters in advanced thermal applications
In some industrial or institutional projects, nonflammability remains a decisive criterion. A1 classification can simplify owner acceptance or site review compared with an A2L pathway, even if both options have low climate impact.
At the same time, A1 does not eliminate the need for good engineering. Low-pressure fluids still require system-specific evaluation, especially in chillers and thermal recovery systems.
For higher-intent readers, that practical balance is more useful than marketing language alone.
R1336mzz(Z) vs R1224yd(Z)
A focused side-by-side comparison to help readers understand selection differences.
| Comparison Point | R1336mzz(Z) | R1224yd(Z) |
|---|---|---|
| Current EPA GWP | 2 | 1 |
| Safety class | A1 | A1 |
| Type | Pure HFO | Pure HCFO |
| ODP | 0 | 0.00012 |
| Typical role | Low-pressure chiller / industrial thermal fluid | Low-pressure chillers / ORC / heat recovery |
| Historical SNAP table GWP | 9 | 1 |
| Selection theme | A1 ultra-low-GWP thermal fluid | A1 ultra-low-GWP chiller refrigerant |
R1336mzz(Z) safety: A1 is attractive, but low-pressure application fit still matters
R1336mzz(Z) is classified A1, which makes it easier to position than lower-flammability options in some projects. Still, safety evaluation is not only about flammability. Designers must look at the actual machinery, operating pressures, decomposition scenarios, ventilation and maintenance environment.
- A1 classification: Nonflammable / lower toxicity under ASHRAE classification.
- Low-pressure use: System selection remains application-specific.
- Engineering review: Chillers and thermal systems should be evaluated by OEM or qualified engineers.
Leak detection
R1336mzz(Z) is not usually discussed like a common field-service refrigerant, but refrigerant monitoring can still matter in machinery rooms or thermal plants depending on site policy and system size. Detection strategy should distinguish between fixed concentration monitoring and maintenance leak-finding. The GasNose refrigerant library is a useful general starting point for refrigerant detection topics.
U.S. regulations
EPA’s current Technology Transitions table gives R1336mzz(Z) a GWP of 2. Older SNAP listings often showed GWP 9 and list the fluid as acceptable in new centrifugal chillers and industrial process air conditioning. The correct regulatory reading is therefore to combine current GWP awareness with the specific SNAP end-use listing.
EU / international context
In Europe, R1336mzz(Z) is often discussed as part of the broader move toward ultra-low-GWP fluids for specialized thermal systems. The key considerations are usually application fit, standards and OEM platform strategy rather than a simple “retrofit” narrative.
Phaseout / long-term view
R1336mzz(Z) is not a classic phaseout target. Its market future depends more on specialized equipment adoption and competition from other very-low-GWP low-pressure fluids than on direct climate restrictions.
Misconceptions to avoid
Several refrigerants are misunderstood because readers focus on one number or one trade name. These points help keep the topic accurate.
“R1336mzz(Z) is just another mainstream AC refrigerant.”
Its strongest role is in low-pressure chillers and specialized thermal systems, not ordinary split AC.
“All EPA documents show the same GWP.”
Older SNAP tables often show 9, while the current EPA Technology Transitions reference table shows 2.
“A1 means no system engineering review is needed.”
A1 helps with flammability, but application fit and system design still matter.
“R1336mzz(Z) automatically replaces any low-pressure refrigerant.”
Selection remains equipment-specific and should not be reduced to one-number marketing.
Related refrigerants and alternatives
- R1224yd(Z)A1 low-pressure refrigerant with EPA GWP 1.
- R514ALow-pressure option with very low GWP but B1 classification.
- R245faLegacy A1 low-pressure HFC with much higher GWP.
R1336mzz(Z) refrigerant FAQ
Concise answers to common questions about properties, uses, safety class and regulatory context.
What is R1336mzz(Z)?
R1336mzz(Z) is an ultra-low-GWP, A1 HFO fluid used mainly in low-pressure chillers and specialized thermal systems.
What is the current EPA GWP of R1336mzz(Z)?
The current EPA Technology Transitions reference table lists a 100-year GWP of 2.
Why do some older sources show GWP 9?
Older EPA SNAP listings commonly used a different reference basis and often show 9.
Is R1336mzz(Z) flammable?
No. It is classified A1.
Is R1336mzz(Z) a blend?
No. It is a pure fluid.
Where is R1336mzz(Z) used?
Typical discussions include centrifugal chillers, industrial process air conditioning, high-temperature heat pumps and ORC systems.
Is R1336mzz(Z) a direct retrofit for common AC refrigerants?
No. It is mainly a specialized low-pressure thermal fluid.
How does it compare with R1224yd(Z)?
Both are A1 and very low GWP, but they have different chemistry and application-selection details.
Why is R1336mzz(Z) important for content strategy?
Because it strengthens your advanced chiller and industrial thermal cluster.
How should R1336mzz(Z) leak monitoring be approached?
As an application-specific machinery-room or plant monitoring question, not only a generic handheld leak-finder issue.
Authoritative sources
Primary EPA references are prioritized, with supporting official or technical industry sources where helpful.
- EPA — Technology Transitions GWP Reference Table
- EPA — Substitutes in Centrifugal Chillers
- EPA — Substitutes in Industrial Process Air Conditioning
- EPA — Regulations, Proposed Rules and Final Rules
- CLI — Climalife R1336mzz(Z) overview
- OPT — Opteon SF33 / HFO-1336mzz-Z page
- SCI — Condensation and thermophysical properties of R1336mzz(Z)
- GAS — GasNose Refrigerant Gas Library
Need help selecting or monitoring refrigerants?
Refrigerant choice is not only about GWP. Safety class, end use, machinery design, regulations and leak detection strategy all matter. If you are evaluating a transition project, ask for technical support.