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# Ethanol Freeze Protected Water Solutions

## Freezing temperature and flash points for ethanol based water solutions or brines.

### Ethanol based Water Solutions Freezing Point

Ethanol Freeze Protected Water Solutions - Freezing Points
Ethanol Concentration
(% by volume)
0102030405060708090100
Freezing Point (oF) 32 25 15 5 -10 -25 -35 -55 -75 -110 -175
(oC) 0 -4 -9 -15 -23 -32 -37 -48 -59 -73 -115

### Flash Points of Ethanol based Water Solutions

The flash point of a chemical is the lowest temperature where it will evaporate enough fluid to form a combustible concentration of gas. The flash point is an indication of how easy a chemical may burn.

Ethanol Freeze Protected Water Solutions - Flash Points
Ethanol Concentration
(% by weight)
510203040506070809096
Flash Point (oF) 144 120 97 84 79 75 72 70 68 63 55
(oC) 62 49 36 29 26 24 22 21 20 17 13

### Warning

• HIGH flammability if pure

Download and print Ethanol Water Solution - Freezing Temperature and Flash Point chart.

### Alternatives to Ethanol based Water Solutions

#### Example - Ethanol Concentration at Freezing Point at -20oC

By using linear interpolation between two known concentrations and their freezing points - the concentration at a third freezing point can be calculated as

CC = [(CB - CA) / (tB - tA)] (tC - tA) + CA                                (1)

where

C = concentration in ethanol - water solution

t = freezing point (oC, oF)

A, B = known freezing points

C = calculated freezing point

The ethanol concentration with freezing point at -20oC can be calculated by interpolating the concentration between freezing point -15oC and -23oC in the table above.

Cc = [((40 %) - (30 %)) / ((-23 oC) - (-15 oC))] ((-20 oC) - (-15 oC)) + (30 %) = 36.25 %

Note that this calculation is simplified by assuming that the concentration vs. freezing point follows a straight line. This not necessary correct.

If a 90% ethanol-water solution shall be mixed with clean water to achieve a freezing point of -20oC (ethanol concentration 36.25% (0.3625)) - the amount of added water can be calculated with volume balance - the amount of ethanol before mix is the same as after the mix:

C Vs = Cm (Vs + Vw)                                                        (2)

where

Vs = volume of the ethanol - water solution (liter, gallon)

Cm = concentration in mix

Vm = volume of mix (liter, gallon)

Vw = volume of the added clean water (liter, gallon)

Rearranging the equation to express the volume of water added to the mixture

Vw = (C - Cm) Vs / Cm                                                     (2b)

Substituting with values

Vw = (0.9 - 0.3625) Vs / 0.3625

= 1.48 Vs

- for every liter 90% ethanol-water solution 1.48 liter of clean water must be mixed in to achieve an ethanol concentration of 36.25 % and freezing point -20oC.

## Related Topics

• ### Material Properties

Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
• ### Melting and Freezing Points

Melting and freezing points of elements and chemical species at varying conditions.

## Related Documents

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Freezing point, density, specific heat and dynamic viscosity of Calcium Chloride Water coolants.
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Online calculator, figures and tables showing dynamic and kinematic viscosity of ethanol, C2H5OH, at varying temperature and pressure - Imperial and SI Units.
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Online calculator, figures and tables showing density and specific weight of ethanol at temperatures ranging from -25 to 325 °C (-10 to 620 °F) at atmospheric and higher pressure - Imperial and SI Units.
• ### Ethanol - Specific Heat vs. Temperature and Pressure

Online calculators, figures and tables showing specific heat , Cp and Cv, of gasous and liquid ethanol at temperatures ranging from -25 to 325 °C (-10 to 620 °F) at atmospheric and higher pressure - Imperial and SI Units.
• ### Ethanol Water Mixtures - Densities vs. Temperature

Density of Ethyl Alcohol aqueous solutions.
• ### Ethylene Glycol Heat-Transfer Fluid Properties

Properties like freezing point, viscosity, specific gravity and specific heat of ethylene glycol based heat-transfer fluids, or brines.
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Comparing antifreezes used in water based heat transfer fluids or brines.
• ### Freezing Mixtures and Cooling Agents

Freezing mixtures, cooling agents and freezing points.
• ### Hazard vs. Flash Points

The flash point of a chemical indicates how easy it may ignite and burn.
• ### Hydrocarbons, Alcohols and Acids - Boiling points

Boiling temperatures (°C and °F) with varying carbon numbers up to C33.
• ### Isopropanol (2-Propanol) based Freeze Protected Water Solutions

Freezing and flash points of isopropanol (2-Propanol) based water solutions or brines.
• ### Liquids - Freezing and Melting Points

Common fluids and their freezing and melting points.
• ### Melting points of Hydrocarbons, Alcohols and Acids

Melting temperature (°C and °F) with carbon number up to C33.
• ### Methanol Freeze Protected Heat Transfer Liquids

Freezing and flash points for methanol or methyl based heat-transfer fluids or brines.
• ### Propylene Glycol based Heat-Transfer Fluids

Freezing points of propylene glycol based heat-transfer fluids suitable for the food processing industry.
• ### Sodium Chloride Water Solutions

Freezing point, density, specific heat and dynamic viscosity of Sodium Chloride and Water coolant.

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## Citation

• The Engineering ToolBox (2005). Ethanol Freeze Protected Water Solutions. [online] Available at: https://www.engineeringtoolbox.com/ethanol-water-d_989.html [Accessed Day Month Year].

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9.19.12