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 the slightest 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 Point 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
Temperature	(^oF)	32	26	18	7	-8	-29	-55
Temperature	(^oC)	0	-3	-8	-14	-22	-34	-48

Due to slush creation propylene glycol and water solutions should not be used close to the freezing points.

Specific Gravity of Propylene Glycol Solutions

Specific gravity of propylene glycol is in the range

Specific Gravity - SG -
Propylene Glycol Solution (% by mass)	0	10	20	30	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 60^oF.

Boiling Points of Propylene Glycol Solutions

Boiling points of propylene glycol

Boiling Point
Propylene Glycol Solution (% by mass)	0	10	20	30	40	50	60
Temperature (^oF)	212	212	213	216	219	222	225

T(^oC) = 5/9[T(^oF) - 32]

Specific Heat Capacity of Propylene Glycol Solutions

Specific heat capacity of propylene glycol

Specific Heat Capacity
Propylene Glycol Solution (% by mass)	0	10	20	30	40	50	60
Specific Heat - c_p - (Btu/lb.^oF)	1.000	0.980	0.960	0.935	0.895	0.850	0.805

1 Btu/(lb_m^oF) = 4,186.8 J/(kg K) = 1 kcal/(kg^oC)

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Related Topics

Material Properties Material properties - density, heat capacity, viscosity and more - for gases, fluids and solids

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