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R-410A (saturated liquid)

R-410A saturated liquid from −40 to 60 °C — the high-pressure blend in most modern split systems and heat pumps, running roughly 60 % above R-134a pressures.

PhaseLiquid — saturated state
Temperature range-40 to 60 °C
SourceNIST REFPROP / ASHRAE Handbook—Fundamentals, Ch. 30, saturated liquid line

R-410A (saturated liquid), property by property

Properties at temperature
°C
-40°60°

Validated from -40 to 60 °C along the saturation curve.

Density1,046 kg/m³
Dynamic viscosity0.14 mPa·s
Specific heat1.6 kJ/(kg·K)
Thermal conductivity0.099 W/(m·K)
Vapour pressure1,444.2 kPa
Latent heat of vaporisation202.9 kJ/kg
Kinematic viscosity ν = µ/ρ0.13384 mm²/s
Prandtl number Pr = cpµ/k2.263

Click on a chart to print it with your selected value marked.

Density kg/m³
Density from -40 to 60 °C, in kg/m³. Marked at 20 °C: 1,046 kg/m³-40 °C — 1,268 kg/m³-30 °C — 1,236 kg/m³-20 °C — 1,203 kg/m³-10 °C — 1,168 kg/m³0 °C — 1,130 kg/m³10 °C — 1,090 kg/m³20 °C — 1,046 kg/m³30 °C — 997 kg/m³40 °C — 941 kg/m³50 °C — 875 kg/m³60 °C — 790 kg/m³800900100011001200-40-200204060
Dynamic viscosity mPa·s
Dynamic viscosity from -40 to 60 °C, in mPa·s. Marked at 20 °C: 0.14 mPa·s-40 °C — 0.285 mPa·s-20 °C — 0.22 mPa·s0 °C — 0.175 mPa·s20 °C — 0.14 mPa·s40 °C — 0.11 mPa·s60 °C — 0.082 mPa·s0.10.150.20.25-40-200204060
Specific heat kJ/(kg·K)
Specific heat from -40 to 60 °C, in kJ/(kg·K). Marked at 20 °C: 1.6 kJ/(kg·K)-40 °C — 1.35 kJ/(kg·K)-20 °C — 1.4 kJ/(kg·K)0 °C — 1.48 kJ/(kg·K)20 °C — 1.6 kJ/(kg·K)40 °C — 1.8 kJ/(kg·K)60 °C — 2.3 kJ/(kg·K)1.41.61.822.2-40-200204060
Thermal conductivity W/(m·K)
Thermal conductivity from -40 to 60 °C, in W/(m·K). Marked at 20 °C: 0.099 W/(m·K)-40 °C — 0.135 W/(m·K)-20 °C — 0.123 W/(m·K)0 °C — 0.111 W/(m·K)20 °C — 0.099 W/(m·K)40 °C — 0.087 W/(m·K)60 °C — 0.073 W/(m·K)0.080.10.12-40-200204060
Vapour pressure kPa (log scale)
Vapour pressure from -40 to 60 °C, in kPa (log scale). Marked at 20 °C: 1,444 kPa-40 °C — 175 kPa-30 °C — 269.6 kPa-20 °C — 399.6 kPa-10 °C — 573 kPa0 °C — 798.7 kPa10 °C — 1,086 kPa20 °C — 1,444 kPa30 °C — 1,883 kPa40 °C — 2,413 kPa50 °C — 3,044 kPa60 °C — 3,788 kPa1000-40-200204060
Latent heat of vaporisation kJ/kg
Latent heat of vaporisation from -40 to 60 °C, in kJ/kg. Marked at 20 °C: 202.9 kJ/kg-40 °C — 276.2 kJ/kg-30 °C — 267 kJ/kg-20 °C — 256.9 kJ/kg-10 °C — 245.6 kJ/kg0 °C — 233 kJ/kg10 °C — 218.9 kJ/kg20 °C — 202.9 kJ/kg30 °C — 184.5 kJ/kg40 °C — 162.9 kJ/kg50 °C — 136.5 kJ/kg60 °C — 102 kJ/kg150200250-40-200204060

Full pages: density · dynamic viscosity · specific heat · thermal conductivity · vapour pressure · latent heat of vaporisation

Saturated state only. On the saturation curve temperature and pressure are locked together, so one input fixes everything — but sub-cooled liquid and superheated vapour need two, and these values do not describe them.

Send R-410A at 20 °C into a solver

Every fluid property in these opens already filled, all from the same state — so a density and a viscosity in one calculation always describe the same fluid at the same temperature.

Reynolds Number

ρ = 1046μ = 0.14

Poiseuille's Law

μ = 0.14

Learning zone

R-410A is a near-azeotropic blend of R-32 and R-125 in equal parts by mass. "Near-azeotropic" means its temperature glide is about 0.1 K — small enough that it can be treated as a pure substance for field work, unlike genuinely zeotropic blends such as R-407C with 6 K of glide where evaporator inlet and outlet saturation temperatures genuinely differ. One consequence does survive: R-410A must be charged as a LIQUID from the cylinder, because drawing vapour would preferentially remove the more volatile component and shift the mixture.

The defining characteristic is pressure. At 40 °C its saturation pressure is 2413 kPa against R-134a's 1017 — nearly two and a half times — and a hot-day condensing pressure of 3000 kPa (about 420 psig) is routine. That is why R-410A equipment uses heavier tubing, different service gauges and 800 psi rated hoses, and why R-22 systems could never simply be retrofitted with it.

The payoff is capacity. Latent heat is markedly higher than R-134a's — 233 kJ/kg at 0 °C against 199 — and the higher pressure means higher vapour density, so a given compressor displacement moves substantially more heat. That is what allowed the compact high-efficiency split systems and heat pumps of the last two decades.

Watch the top of the range. Its critical point is 71.4 °C, so the properties change violently above about 50 °C: density falls off a cliff, latent heat collapses from 137 kJ/kg at 50 °C to 102 at 60, and specific heat spikes. A heat pump asked to make hot water on a hot day is operating uncomfortably close to that, which is a real limit on air-to-water heat pump leaving temperatures. Its GWP of 2088 is now driving replacement by R-32 and R-454B.