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Propylene Glycol based Heat-Transfer Fluids

Freezing points of propylene glycol based heat-transfer fluids - suitable for the food processing industry

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For many heat-transfer applications it is necessary to use a heat-transfer fluid with lower freezing point than water. The most common antifreeze fluid - ethylene glycol - must not be used where there is a chance of leakage to potable water or food processing systems.

In food processing systems the common heat-transfer fluid is based on propylene glycol.

Freezing Points of Propylene Glycol based Water Solutions

Freezing point of propylene glycol based water solutions at different temperatures:

Freezing Point
Propylene Glycol Solution
(%)
by mass 0 10 20 30 40 50 60
by volume 0 10 19 29 40 50 60
Temperature oF 32 26 18 7 -8 -29 -55
oC 0 -3 -8 -14 -22 -34 -48

Due to slush creation - a propylene glycol and water solution should not be used close to freezing points.

Specific Gravities of Propylene Glycol Solutions

Specific gravity of propylene glycol solutions:

Specific Gravity - SG -
Propylene Glycol Solution
(%)
by mass 0 10 20 30 40 50 60
by volume 0 10 20 29 40 50 60
Specific Gravity - SG - 1) 1.000 1.008 1.017 1.026 1.034 1.041 1.046

1) Specific gravity based on propylene glycol solutions with temperature 60oF.

Boiling Points of Propylene Glycol Solutions

Boiling points of propylene glycol solutions:

Boiling Point
Propylene Glycol Solution
(%)
by mass 0 10 20 30 40 50 60
by volume 0 10 20 29 40 50 60
Temperature (oF) 212 212 213 216 219 222 225
  • T(oC) = 5/9[T(oF) - 32]

Specific Heats of Propylene Glycol Solutions

Specific heat capacity of propylene glycol solutions:

Specific Heat
Propylene Glycol Solution
(%)
by mass 0 10 20 30 40 50 60
by volume 0 10 20 29 40 50 60
Specific Heat
- cp -
(Btu/lb.oF)
1.000 0.980 0.960 0.935 0.895 0.850 0.805
  • 1 Btu/(lbmoF) = 4,186.8 J/(kg K) = 1 kcal/(kgoC)
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  • en: propylene glycol water freezing points
  • es: propileno puntos de congelación del agua glicol
  • de: Propylenglykol-Wasser Gefrierpunkt
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