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Propylene glycol, 60 % by volume

A 60 % by volume propylene glycol solution, freeze protection to about −51 °C — the deepest worthwhile charge, and viscosity is now the design constraint.

PhaseLiquid
Temperature range-35 to 100 °C
Freeze protectionabout -51.1 °C — full curve, 0 to 60 %
SourceDow, Engineering and Operating Guide for DOWFROST and DOWFROST HD, SI tables, by volume; typical values for inhibited product
Properties at temperature
°C
-35°100°

Validated from -35 to 100 °C.

Density1,049.4 kg/m³
Dynamic viscosity10.04 mPa·s
Specific heat3.339 kJ/(kg·K)
Thermal conductivity0.302 W/(m·K)
Kinematic viscosity ν = µ/ρ9.5674 mm²/s
Prandtl number Pr = cpµ/k111

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

Density kg/m³
Density from -35 to 100 °C, in kg/m³. Marked at 20 °C: 1,049 kg/m³-35 °C — 1,074 kg/m³-30 °C — 1,073 kg/m³-25 °C — 1,071 kg/m³-20 °C — 1,069 kg/m³-15 °C — 1,067 kg/m³-10 °C — 1,065 kg/m³-5 °C — 1,063 kg/m³0 °C — 1,060 kg/m³5 °C — 1,058 kg/m³10 °C — 1,055 kg/m³15 °C — 1,052 kg/m³20 °C — 1,049 kg/m³25 °C — 1,046 kg/m³30 °C — 1,043 kg/m³35 °C — 1,040 kg/m³40 °C — 1,037 kg/m³45 °C — 1,033 kg/m³50 °C — 1,030 kg/m³55 °C — 1,026 kg/m³60 °C — 1,022 kg/m³65 °C — 1,018 kg/m³70 °C — 1,014 kg/m³75 °C — 1,009 kg/m³80 °C — 1,005 kg/m³85 °C — 1,000 kg/m³90 °C — 995.7 kg/m³95 °C — 991 kg/m³100 °C — 986 kg/m³1000102010401060-20020406080100
Dynamic viscosity mPa·s (log scale)
Dynamic viscosity from -35 to 100 °C, in mPa·s (log scale). Marked at 20 °C: 10.04 mPa·s-35 °C — 524 mPa·s-30 °C — 330.4 mPa·s-25 °C — 211.4 mPa·s-20 °C — 138 mPa·s-15 °C — 92 mPa·s-10 °C — 62.78 mPa·s-5 °C — 43.84 mPa·s0 °C — 31.32 mPa·s5 °C — 22.87 mPa·s10 °C — 17.05 mPa·s15 °C — 12.96 mPa·s20 °C — 10.04 mPa·s25 °C — 7.91 mPa·s30 °C — 6.34 mPa·s35 °C — 5.15 mPa·s40 °C — 4.25 mPa·s45 °C — 3.55 mPa·s50 °C — 3 mPa·s55 °C — 2.57 mPa·s60 °C — 2.22 mPa·s65 °C — 1.93 mPa·s70 °C — 1.7 mPa·s75 °C — 1.51 mPa·s80 °C — 1.35 mPa·s85 °C — 1.22 mPa·s90 °C — 1.1 mPa·s95 °C — 1.01 mPa·s100 °C — 0.92 mPa·s110100-20020406080100
Specific heat kJ/(kg·K)
Specific heat from -35 to 100 °C, in kJ/(kg·K). Marked at 20 °C: 3.339 kJ/(kg·K)-35 °C — 3.096 kJ/(kg·K)-30 °C — 3.118 kJ/(kg·K)-25 °C — 3.14 kJ/(kg·K)-20 °C — 3.162 kJ/(kg·K)-15 °C — 3.184 kJ/(kg·K)-10 °C — 3.206 kJ/(kg·K)-5 °C — 3.228 kJ/(kg·K)0 °C — 3.25 kJ/(kg·K)5 °C — 3.272 kJ/(kg·K)10 °C — 3.295 kJ/(kg·K)15 °C — 3.317 kJ/(kg·K)20 °C — 3.339 kJ/(kg·K)25 °C — 3.361 kJ/(kg·K)30 °C — 3.383 kJ/(kg·K)35 °C — 3.405 kJ/(kg·K)40 °C — 3.427 kJ/(kg·K)45 °C — 3.449 kJ/(kg·K)50 °C — 3.471 kJ/(kg·K)55 °C — 3.493 kJ/(kg·K)60 °C — 3.515 kJ/(kg·K)65 °C — 3.537 kJ/(kg·K)70 °C — 3.559 kJ/(kg·K)75 °C — 3.581 kJ/(kg·K)80 °C — 3.603 kJ/(kg·K)85 °C — 3.625 kJ/(kg·K)90 °C — 3.647 kJ/(kg·K)95 °C — 3.67 kJ/(kg·K)100 °C — 3.692 kJ/(kg·K)3.13.23.33.43.53.6-20020406080100
Thermal conductivity W/(m·K)
Thermal conductivity from -35 to 100 °C, in W/(m·K). Marked at 20 °C: 0.302 W/(m·K)-35 °C — 0.269 W/(m·K)-30 °C — 0.272 W/(m·K)-25 °C — 0.275 W/(m·K)-20 °C — 0.278 W/(m·K)-15 °C — 0.282 W/(m·K)-10 °C — 0.285 W/(m·K)-5 °C — 0.288 W/(m·K)0 °C — 0.291 W/(m·K)5 °C — 0.294 W/(m·K)10 °C — 0.297 W/(m·K)15 °C — 0.299 W/(m·K)20 °C — 0.302 W/(m·K)25 °C — 0.304 W/(m·K)30 °C — 0.307 W/(m·K)35 °C — 0.309 W/(m·K)40 °C — 0.311 W/(m·K)45 °C — 0.313 W/(m·K)50 °C — 0.314 W/(m·K)55 °C — 0.316 W/(m·K)60 °C — 0.317 W/(m·K)65 °C — 0.319 W/(m·K)70 °C — 0.32 W/(m·K)75 °C — 0.321 W/(m·K)80 °C — 0.321 W/(m·K)85 °C — 0.322 W/(m·K)90 °C — 0.323 W/(m·K)95 °C — 0.323 W/(m·K)100 °C — 0.323 W/(m·K)0.270.280.290.30.310.32-20020406080100
Send PG 60 % 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.

Glycol Loop Heat Transfer (Capacity Derate)

ρ = 1049.4cₚ = 3.339

Reynolds Number

ρ = 1049.4μ = 10.04

Prandtl Number

μ = 10.04cₚ = 3.339k = 0.302

Learning zone

Sixty percent propylene glycol is the deep end: ice at about −51 °C, and burst protection below anything a Canadian winter can produce. It is also the end of the useful range — past 60 % more glycol stops helping, because the freeze-point curve bottoms out and turns back up, and propylene glycol mixtures past the eutectic stop freezing crystalline at all, thickening into a glass instead. The curve on this site stops at 60 % for exactly that reason.

The price is viscosity, and at this concentration it is the dominant design constraint. The published table reads 10.0 mPa·s at 20 °C — ten times water — 31.3 at 0 °C, 92.0 at −15 °C, and 524 at −35 °C, the coldest row published. A pump selected on the warm numbers will not move the fluid on a design-day morning, and almost nothing stays turbulent: Reynolds numbers shrink by the same factor the viscosity grows. Systems that genuinely need this charge are sized around the cold-end viscosity first and the heat transfer second.

The other penalties are not small either: specific heat at 20 °C is 3.34 kJ/(kg·K), down 20 % from water, and thermal conductivity is 0.302 W/(m·K), barely half. Note that the property tables stop at −35 °C even though ice holds off to −51 — the manufacturer publishes no colder rows and this library does not extrapolate — so between those two temperatures the loop is protected but the properties are uncharted.