R-513A Refrigerant: What It Is, What It Replaces, and What Section 608 Says

R-513A is a refrigerant blend of 56% R-1234yf and 44% R-134a, classed A1 (non-flammable, lower toxicity) by ASHRAE. EPA's reference table gives it a GWP of 630, against 1,430 for R-134a, which is the refrigerant it is designed to replace. It is not an A2L, and because it contains an HFC it does not escape Section 608.

Most pages that rank for R-513A are product listings, a spec sheet or a supplier blog. They tell you what it is and where to buy it. They rarely tell a technician what is different at the manifold or whether the venting and recovery rules still apply. This article covers both, and it separates what the regulation requires from what is simply good practice.

What is R-513A refrigerant?

R-513A is a two-component blend sold under trade names such as Opteon XP10 and Solstice 513A. One half is R-134a, a familiar HFC. The other is R-1234yf, a hydrofluoroolefin (HFO) with a very low GWP. Blending them pulls the GWP of the mix well below that of straight R-134a while keeping pressures and capacity close to it.

Property	R-513A	R-134a
Composition	56% R-1234yf / 44% R-134a	Single compound
ASHRAE 34 safety group	A1	A1
100-year GWP (EPA table)	630	1,430
Temperature glide	Effectively none (azeotropic)	None
Ozone depletion potential	Zero	Zero

GWP values come from EPA's Technology Transitions GWP reference table. Composition and glide are from the producer's published data, for example Chemours and Honeywell Solstice.

What does R-513A replace?

R-134a. That is the whole design brief. It lets chiller and medium-temperature refrigeration owners move to a lower-GWP refrigerant without leaving behind the pressure range and compressor type they already own.

It sits in the same family of choices covered in our guide to the R-22 replacement options: a "replacement" is a refrigerant someone has tested for a given use, not a drop-in that can go into any system. For an existing R-134a system, the equipment manufacturer decides whether a retrofit is approved and what oil and component changes it needs. Do not decide it from the cylinder label.

Is R-513A flammable?

No. It is classed A1, the same as R-134a and R-410A. That is the main reason technicians are comfortable with it, and the main difference from the A2L refrigerants now entering new air conditioners.

Because it is A1, the A2L handling issues do not apply: no spark-free tool requirement, no mitigation board, no flammable-rated recovery machine. That is not the same as risk-free. Any refrigerant displaces air in a closed space, a point covered in refrigerant safety.

Is R-513A an A2L refrigerant?

No. A2L means mildly flammable. R-513A is A1. The confusion comes from R-1234yf, which is an A2L on its own. In this blend the R-134a suppresses flammability, and the mix as a whole is classed A1. Never infer a blend's safety class from one of its components. Read the cylinder and the ASHRAE designation.

Does Section 608 apply to R-513A?

Yes, in the ways that matter on a service call. Section 608 reaches refrigerants that are in whole or in part an ozone-depleting substance or an approved substitute. R-513A has an HFC component, so you should treat the venting prohibition in 40 CFR 82.154(a) as applying to it. The rule lists the specific substitutes exempted from that prohibition; check that list before assuming a refrigerant is exempt.

Item	Status	Source
No knowing venting of the refrigerant during service	Regulation	40 CFR 82.154(a)
Recovery with certified equipment and a technician certified for the appliance type	Regulation	40 CFR 82.156
Recovery machine manufactured after November 15, 1993 must meet the evacuation table	Regulation, and the date refers to the recovery equipment, not the appliance	40 CFR 82.156
Evacuating to 500 microns before charging	Best practice for dehydration, not a Section 608 requirement	Manufacturer instruction
Charging by liquid or vapor, oil type, charge size	Manufacturer instruction	Equipment literature

Our recovery guide explains the evacuation levels, and which type of certification covers which equipment. Chillers and commercial refrigeration are where R-513A usually turns up, so check your certification matches the equipment. Our Core practice test covers the rules that apply to every refrigerant.

Does the AIM Act affect R-513A?

Indirectly. The AIM Act phases down HFC production and consumption, and R-134a is one of the regulated HFCs. That pressure is a main reason blends like R-513A exist. But the phase-down caps what manufacturers produce and import. It does not ban servicing existing R-134a equipment. Our AIM Act explainer covers where the Act actually binds a technician.

What this means on the job

Read the label, not the name. R-513A and R-134a cylinders look alike on a truck shelf. They are not interchangeable. Adding R-134a to an R-513A system, or the reverse, makes a mixture nobody designed or can recover cleanly.

Use the right pressure data. R-513A pressures run slightly above R-134a at the same temperature, so an R-134a chart gives wrong saturation numbers. If you are comparing, our R-134a pressure chart shows how to read a single-column chart. Use the producer's R-513A data for the real values.

Do not vent it. Because it contains R-134a, it falls under the venting prohibition. Recover it into a cylinder labeled for it.

It is a blend, so label your recovery. Mixed recovered refrigerant is hard to reuse and costs money to dispose of. The wider picture of how refrigerants are grouped is in our guide to types of refrigerant.

If R-513A is on your jobs, the study guide covers the recovery and certification rules the exam tests.

Frequently asked questions

Can I use R-134a instead of R-513A?

Not as a straight swap. They are different refrigerants with different pressures and different design intent. Adding R-134a to an R-513A system creates an unspecified mixture, and the reverse does the same. Follow the equipment manufacturer's instructions, and recover and recharge with the refrigerant on the nameplate.

Is R-513A flammable?

No. ASHRAE classes it A1, meaning non-flammable with lower toxicity. That holds even though one of its components, R-1234yf, is mildly flammable by itself. The blend as a whole is rated A1, so the A2L handling rules do not apply to it.

Is R-513A an A2L refrigerant?

No. It is A1. People confuse it with A2L because R-1234yf, one of its components, is an A2L when used alone. In the 56/44 blend with R-134a the mixture is non-flammable. Check the safety class of the blend itself, never of one ingredient.

Do I need Section 608 certification to work with R-513A?

Section 608 certification is required to handle refrigerant that is covered by the rule. R-513A contains an HFC, so plan on needing the certification that matches the appliance type. Section 609 covers motor vehicle air conditioning. See the 609 guide for the boundary.

What is the GWP of R-513A?

EPA's Technology Transitions reference table lists R-513A at a 100-year GWP of 630. That is less than half of R-134a at 1,430. GWP values vary by the assessment report used, so cite the EPA table when the figure matters for compliance.

Sources

• EPA Technology Transitions GWP reference table
• 40 CFR 82.154, Prohibitions
• 40 CFR 82.156, Required practices
• EPA, Section 608 refrigerant management
• Honeywell Solstice 513A product data