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A formulation that is stable in a beaker can break in the production vessel because shear force and heat transfer act completely differently.
If manufacturability is only checked after formulation release, each correction costs a complete loop.
In color cosmetics, dispersion on a production scale determines whether the shade matches the approval.
In the laboratory, work is carried out in small batches: heat is quickly added and dissipated, stirring is gentle, and the energy input per volume is high. In the production vessel, the opposite is true. The volume grows cubically, the vessel surface area only quadratically, which extends cooling cycles from minutes to hours.
At the same time, industrial homogenizers work with high local shear force and frictional heat. An emulsion that is stable in a beaker can break, cream, or permanently lose its viscosity under these conditions. This is not a manufacturing defect, but a consequence of the fact that the formulation was never designed for these conditions.
Emulsion breakage: systems stable in the laboratory separate in large batches.
Viscosity drop: polymer thickeners lose their structure under industrial shear.
Filling problems: too thin or too viscous masses block the line.
Shade deviation: incomplete pigment dispersion makes batches appear lighter.
What goes wrong during the transition from the laboratory to production
In the laboratory, work is carried out in small batches: heat is quickly added and dissipated, stirring is gentle, and the energy input per volume is high. In the production vessel, the opposite is true. The volume grows cubically, the vessel surface area only quadratically, which extends cooling cycles from minutes to hours.
At the same time, industrial homogenizers work with high local shear force and frictional heat. An emulsion that is stable in a beaker can break, cream, or permanently lose its viscosity under these conditions. This is not a manufacturing defect, but a consequence of the fact that the formulation was never designed for these conditions.
Emulsion breakage: systems stable in the laboratory separate in large batches.
Viscosity drop: polymer thickeners lose their structure under industrial shear.
Filling problems: too thin or too viscous masses block the line.
Shade deviation: incomplete pigment dispersion makes batches appear lighter.
Why the separation is causing the problem
If an external laboratory develops a formulation without knowledge of the future plant, it optimizes for what is measurable: sensory profile, appearance, stability on a small scale. The question of whether the formulation can be reproduced on the specific plant only arises when it has already been approved.
The manufacturing plant, in turn, receives a finished formulation and is expected to implement it. It can adjust process parameters, but not the formulation itself. If the formulation structurally does not fit the plant, the only option is to return it to the laboratory, resulting in a complete loop.
The laboratory does not know the plant on which production will later take place.
The plant can adjust processes, but not the formulation.
Every correction costs a complete development and testing loop.
How to structurally avoid such loops is described in Reducing coordination loops.
What an integrated design specifically does differently
If development and production are in-house, the order of the questions changes. Already with the first sample, it is clear on which system production will take place later, which shear rates and temperature curves can be achieved there, and which filling technology is available.
The formulation is therefore developed within these limits right from the start, instead of forcing it in afterwards. Raw materials are also selected based on whether they are available in production volumes and are consistent between batches, which often plays no role in a pure laboratory context.
System parameters are known from the first sample and are planned for.
Raw material selection takes into account availability and batch consistency in production volumes.
Filling technology and packaging materials are integrated into the formulation decision at an early stage.
Test stability early against real-world conditions
An integrated setup allows the formulation to be tested not only under laboratory conditions, but also against the stresses that actually occur in production. This includes shear stress in the area of the future system, realistic cooling curves, and testing in the final packaging.
The accelerated stability testing over twelve weeks remains unaffected by this; it is the regulatory proof. The difference is that it starts with a formulation that is already known to be manufacturable, rather than one whose manufacturability is still open. The scope of testing is described in Stability and Safety Testing.
Check shear stress in the area of the future production plant.
Represent realistic cooling curves instead of laboratory conditions.
Only start stability testing once manufacturability has been clarified.
Color cosmetics: where the difference becomes most apparent
The effect is most pronounced with complexion products. The shade depends not only on the amount of pigment, but also on how completely the pigments are dispersed. In the laboratory, the energy input is high enough to reliably break up agglomerates. On a production scale, it is lower, which means that residues remain and the batch appears lighter and less saturated.
If the shade is released in the laboratory without the dispersion having been tested on a production scale, the first production delivery will deviate visibly from the sample. Release should therefore be carried out spectrophotometrically with a defined tolerance, and the dispersion time should be documented as a binding process parameter. Basics on this in Shade development for make-up.
Spectrophotometric release with a defined tolerance instead of visual assessment.
Document dispersion time and energy input in a binding manner.
Cross-check the shade against the production sample, not just the laboratory sample.
What this means operationally
The practical benefit lies less in the speed of individual steps than in the elimination of loops. If manufacturability is clarified early on, the most common cause of delays shortly before launch is eliminated, namely returning a formulation that has already been approved back to the laboratory.
In addition, there is the documentation. Manufacturing according to ISO 22716 requires seamless batch traceability from raw material delivery to the filled product. If development and production are integrated, these documents are created during the process rather than afterwards, which significantly simplifies the creation of the product information file.
Fewer loops instead of faster individual steps.
Batch documentation is created during the process, not afterwards.
One contact partner for formulation, testing, and production.
How this results in a reliable schedule is shown in Time-to-Market verkuerzen.
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FAQ
Why does a formulation that is stable in the laboratory fail in production?
Because shear force and heat transfer act completely differently. In the vessel, the volume grows cubically, while the surface area only increases quadratically, which greatly extends cooling cycles. At the same time, industrial homogenizers generate high local shear forces. A formulation that was never designed for these conditions can break in the process.
Can't the manufacturing plant just compensate for that?
Only to a limited extent. He can adjust process parameters such as stirring speed and temperature control, but not the formulation itself. If the formulation does not structurally fit the plant, the only option left is to return it to the laboratory, resulting in a complete development and testing loop.
What specifically changes with an integrated structure?
The equipment parameters are known from the very first sample. The formulation is developed within the achievable shear rates, temperature curves, and filling conditions instead of being forced in retrospectively. In addition, raw materials are selected in production quantities according to availability and batch consistency.
Why is color cosmetics particularly affected by this?
Because the shade depends on the completeness of the pigment dispersion. On a production scale, the energy input per volume is lower than in the laboratory, so that agglomerates remain and the batch looks lighter. If the shade is only approved in the laboratory, the first production delivery will deviate visibly.
Does an integrated design shorten development time?
Not the individual steps, but the overall duration. The twelve-week stability test remains unchanged. The benefit comes from eliminating loops, because manufacturability is clarified before the testing phase starts.
What role does the documentation play?
Manufacturing according to ISO 22716 requires seamless batch traceability from raw material delivery to the filled product. When development and manufacturing are combined, these documents are created during the process instead of retrospectively, which significantly simplifies the creation of the product information file.
