Fluids / Propylene glycol, 50 % by volume
Density of propylene glycol, 50 % by volume vs temperature
A 50 % by volume propylene glycol solution, freeze protection to about −33 °C — full winter protection, and the concentration where the pumping penalty stops being ignorable.
Density in kg/m³, from -30 to 100 °C. The chart and the table below are the same numbers; the table is the one you can copy.
| Specific heat | 3.54 kJ/(kg·K) |
| Dynamic viscosity | 7.6 mPa·s |
| Thermal conductivity | 0.388 W/(m·K) |
| Temperature (°C) | Density (kg/m³) | Row |
|---|---|---|
| -30 | 1,062 | published |
| -20 | 1,058 | published |
| -10 | 1,055 | published |
| 0 | 1,051 | published |
| 10 | 1,046.3 | interpolated |
| 20 | 1,041 | published |
| 30 | 1,035.2 | interpolated |
| 40 | 1,029 | published |
| 50 | 1,022.6 | interpolated |
| 60 | 1,016 | published |
| 70 | 1,009.1 | interpolated |
| 80 | 1,002 | published |
| 90 | 994.56 | interpolated |
| 100 | 987 | published |
Rows marked published land exactly on a source anchor and are the tabulated figure. The rest are this library’s interpolation between the two anchors either side — good enough to design with, and said out loud so you can decide that for yourself.
ASHRAE Handbook—Fundamentals, Ch. 31 (Secondary Coolants), interpolated from published tables · validated -30 to 100 °C · interpolated between 9 published anchors (values held, not extrapolated, past the ends)