The natural refrigerant for chillers, cold-chain, and EV thermal.
HCR 4343 is engineered to match the pressure and oil-compatibility curve of R-134, the lowest-pressure legacy refrigerant in the Eco Kold line. A GWP under 1, against R-134's 1,100, puts this blend among the largest GWP reductions we offer. Detailed charge and pressure specifications are available on request.
HCR 4343
The GWP gap that matters most.
R-134 carries a Global Warming Potential of 1,100. HCR 4343 replaces it at a GWP of <1, with zero ozone depletion.
Systems still running on R-134.
Water-cooled · process cooling · district
HCR 4343 is engineered to match R-134's pressure curve and oil compatibility for a recharge-style retrofit rather than a full system swap.
Legacy R-134 refrigeration and process loops
A drop-in path off R-134 with zero ozone depletion and a GWP of <1, without changing the compressor, oil, or line set.
R-134 vs R-134A: confirm which one you have
R-134 and R-134A are distinct refrigerants. If your equipment nameplate or service records say R-134A, see HCR 4343A instead.
Different refrigerant? Different blend.
HCR 4343 covers R-134. The other four Eco Kold blends cover low-temp refrigeration, AC, legacy R-22 systems, and R-134A.
Specifications & safety classification.
For engineers, contractors, and procurement. Full charge and pressure specifications available on request.
Operating envelope
| Composition | Hydrocarbon blend (propane/isobutane base) |
|---|---|
| Operating pressure | Available on request |
| Oil compatibility | POE · PAG · mineral oil |
Environmental & safety
| GWP | <1 |
|---|---|
| ODP | 0 |
| Safety class | A3 · flammable · standard HC handling |
| EPA SNAP | Submitted: under review · not yet listed |
| Charge limit | Per IEC 60335-2-89, IEC 60079-15 |
Recover, evacuate, recharge. Same equipment, one certified technician.
Retrofit-ready: minimal to no equipment changes. Hydrocarbon refrigerant (ASHRAE A3, flammable); install by a qualified technician. Exact charge weight is confirmed per system: request a quote with your equipment details.
Recover the legacy refrigerant.
Pull the R-134 charge through a certified recovery machine into an approved reclaim cylinder. Never vent. EPA-licensed technicians only.
Pull a deep vacuum.
Evacuate the system to 500 microns or lower. Hold the vacuum to verify no leaks. This step is identical to a standard refrigerant change-out.
Charge with HCR 4343.
Charge weight is confirmed per system based on the original R-134 charge. Send your equipment details for the exact conversion.
Common questions about HCR 4343.
What does HCR 4343 replace?
HCR 4343 is the drop-in hydrocarbon refrigerant replacement for R-134. If your system runs R-134A instead, see HCR 4343A: the two are distinct refrigerants with different specifications.
What is the GWP of HCR 4343?
HCR 4343 has a Global Warming Potential of <1. R-134 carries a GWP of 1,100.
Is HCR 4343 EPA SNAP listed?
HCR 4343 has been submitted to the EPA SNAP program and is under review; it is not yet listed. The blend is A3 classified and complies with IEC 60335-2-89 charge limits for hydrocarbon refrigerants.
What are the charge and pressure specifications for HCR 4343?
Detailed per-system charge and pressure specifications are available on request. Contact engineering with your equipment details for a system-specific datasheet.
Running R-134 in a chiller or industrial system?
Send us the system type and current charge. We'll confirm whether HCR 4343 or HCR 4343A is the right match, quote pricing, and connect you with a certified installer.