Technical Note #006: The Freezing Curve – The Real Key to Ice Cream Texture
- A. Djoudi
- Jul 30
- 3 min read
Introduction
The quality of an ice cream depends not only on its formulation, but also on how it behaves as the temperature changes.
Throughout production, hardening, storage, display, and serving, ice cream is constantly evolving.
Understanding this behavior is essential for controlling firmness, scoopability, creaminess, and serving quality.
This is exactly what the freezing curve helps us understand.
Ice Cream Is Never Completely Frozen
Contrary to popular belief, ice cream never becomes a completely solid block of ice.
As the temperature decreases:
part of the water gradually crystallizes;
another part remains in the liquid state;
sugars and other dissolved solids become increasingly concentrated in the unfrozen water.
Even at −18 °C (0 °F), a significant proportion of the water remains unfrozen.
The balance between frozen and unfrozen water directly affects:
firmness;
viscosity;
scoopability;
mouthfeel;
product stability.
Why Is the Freezing Curve Important?
The freezing curve describes how the percentage of frozen water changes with temperature.
It provides valuable insight into how an ice cream recipe will behave throughout its entire life cycle:
immediately after batch freezing;
during hardening;
during frozen storage;
in the display cabinet;
during serving.
Unlike a single numerical index, the freezing curve provides a physical representation of how the formulation actually behaves.
An Optimal Serving Temperature for Every Recipe
Not every ice cream should be served at the same temperature.
A formulation rich in sugars or milk fat behaves differently from a lighter formulation.
Gelato Pro Software automatically calculates the freezing curve for each recipe and determines the serving temperature corresponding to a target of 70% frozen water.
This target provides an excellent balance between:
sufficient firmness;
good scoopability;
a smooth and creamy texture.
A Customizable Approach
Every production facility has its own working methods and quality objectives.
For this reason, Gelato Pro Software allows users to customize the range of frozen water considered optimal.
By default:
Recommended range: 65% to 75% frozen water
Target value: 70% frozen water
These parameters can be adjusted to match production practices, equipment, or specific product requirements.
Simulating Real Serving Conditions
The serving temperature calculated by the software is a recommended reference value.
In practice, the actual temperature inside a display cabinet may vary depending on operating conditions.
Gelato Pro Software allows users to adjust the serving temperature to simulate real operating conditions.
Whenever the serving temperature is adjusted, the software instantly recalculates:
the hardness index;
the percentage of frozen water;
the overall behavior of the recipe.
This enables users to immediately visualize how temperature variations affect the texture of the finished product.
A Practical Formulation Tool
This simulation helps formulators answer practical questions such as:
Will my ice cream still be easy to scoop at −13 °C?
What happens if my display cabinet is set to −10 °C instead of −12 °C?
Should I adjust the formulation or simply change the serving temperature?
How will the texture change during storage?
The freezing curve is therefore much more than a graph—it is a powerful decision-making tool for formulators.
The Gelato Pro Software Approach
Rather than relying solely on empirical indices, Gelato Pro Software is based on a physical model of ice cream behavior.
The software calculates:
the freezing curve;
the percentage of frozen water;
the serving temperature;
the hardness index;
how these parameters evolve as temperature changes.
This approach provides a much deeper understanding of how a recipe behaves under real production, storage, and serving conditions.
Conclusion
The freezing curve is one of the most valuable tools for understanding how an ice cream recipe responds to temperature.
By directly linking the serving temperature to the percentage of frozen water, Gelato Pro Software provides practical insights that can be applied immediately during formulation and production.
More than simply balancing a recipe, Gelato Pro Software enables formulators to predict the behavior of the finished product and optimize it for real production, storage, and serving conditions.
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