Shampoo Scale-Up Case: Building a Lab-to-Factory Process Comparison

A scale-up mismatch becomes actionable when the laboratory and factory routes can be compared stage by stage. In a 2019 shampoo scale-up case, the raw-material suppliers and formula proportions stayed the same, while the factory used a different mixing sequence. The record gives us one confirmed process divergence. This article helps you identify the first meaningful process difference, build a practical comparison sheet and decide what one controlled production trial should test next.

Conceptual comparison of development and production samples before their process records are aligned.

The 2019 record isolates one process divergence

The shampoo formula had gone through several development adjustments before it moved to an OEM factory. The development sample met the customer’s target, but repeated factory samples differed from it.

The review established two fixed points: the raw-material suppliers had not changed and the formula proportions had not changed. The factory process had. Its usual sequence introduced homogenization early to speed AES dissolution instead of following the development route.

Recorded point	Case detail
Year	2019
Development status	The adjusted development sample met the customer’s target
Recorded fixed variables	Raw-material suppliers and formula proportions
Recorded process difference	The factory used its usual sequence and homogenized to speed AES dissolution
Engineer’s attribution	The early homogenization stage affected the high-molecular-weight conditioning polymer
Reported consequences	Product performance, viscosity and stability were affected; no numerical results were recorded

Source: a 2019 case shared by an INNO collaborating formulation engineer in the shampoo formulation and process training resource, page 80. Customer and factory identities are omitted.

The engineer connected the early homogenization step with the high-molecular-weight conditioning polymer and the resulting change in product performance, viscosity and stability. The source does not identify the exact polymer grade or provide measured before-and-after values. Those details remain outside the evidence available for this case.

Build a lab-to-factory process-equivalence sheet

A useful scale-up review puts both routes into the same structure. The aim is to show where the two processes first stop being equivalent and what each ingredient experiences at that point.

Define the property that must transfer

“The factory sample is different” leaves several possible investigations open. We would first name the property that changed, such as viscosity, conditioning feel or a stability observation, and record how and when both samples were evaluated. This gives the next trial a defined output instead of a general request to reproduce the lab sample.

Compare process stages rather than equipment names

Laboratory and factory equipment do not need the same name or scale. Their process purpose and endpoint still need to be comparable. The review becomes clearer when addition, wetting, dissolution, polymer preparation, homogenization, finishing and equilibration are shown as stages.

Comparison field	Laboratory record	Factory record	Why it belongs in the review
Formula version and batch basis	Version and batch size used for the approved sample	Version and batch size used in production	Confirms that the comparison starts from the intended formula
Ingredient identity	Supplier and grade recorded for relevant materials	Supplier and grade recorded for the factory batch	Separates a material change from a process change
Addition sequence	Stage and order used in development	Stage and order used in production	Reveals the first point at which ingredients met different conditions
Mixing operation	Mixer type, purpose, duration or endpoint	Mixer type, purpose, duration or endpoint	Makes “mix” and “homogenize” operationally comparable
Temperature and pH history	Readings at relevant stages	Readings at the same relevant stages	Shows whether the material experienced another process environment
Evaluation	Method, timing and result for the target property	Matching method, timing and result	Prevents a test-method difference from being mistaken for a process effect

Record what the conditioning polymer experienced

For this 2019 case, the process sheet needs to show when the conditioning polymer was prepared, when it entered the main batch and whether high shear occurred before or after that stage. The historical record points to early homogenization, but a new project still needs its own grade, equipment and process information.

Process sequence reconstructed from the 2019 case record. It separates the common starting point from the first recorded divergence.

Use the first divergence to design one confirmation trial

Once the first meaningful divergence is visible, the next comparison can change that feature while keeping the rest of the test readable. In a case like this, one route can follow the documented development sequence and the other can use the proposed factory sequence under recorded conditions.

Trial element	Control route	Comparison route	Record used for the decision
Formula and relevant grades	Held constant	Held constant	Batch sheet and material identity
Process sequence	Documented development route	One selected factory-stage difference	Time-stamped process record
Target property	Same agreed method and timing	Same agreed method and timing	Viscosity, stability or sensory result defined for the project
Other changes	Kept outside this comparison	Kept outside this comparison	Deviation record if an additional change occurs

The measurement should follow the original mismatch. If viscosity changed, both samples need the same method, temperature and equilibration time. If conditioning feel changed, the evaluation basis should be agreed before the samples are compared. Stability observations need their own conditions and schedule.

One comparison route discussed in the historical review places conditioning-polymer addition after the high-shear stage. The suitable route still depends on the actual grade and process.

The source ends with an engineering attribution and a proposed process route. It does not record a recovery trial, quantified improvement, saved batch or cost reduction. The table above is a method for the next investigation, not a claimed result from 2019.

Turn the comparison into a usable factory handoff

A useful handoff carries the conditions that the approved sample depended on. It can remain short if each line has a clear purpose:

• approved formula version and batch basis;
• relevant ingredient supplier and grade;
• preparation and addition sequence;
• mixing purpose, equipment and endpoint at each relevant stage;
• temperature, pH and hold points;
• target property, test method and evaluation time.

This record does more than tell production to copy a beaker procedure. It explains which process conditions support the target and which observations confirm that the larger batch remains comparable.

Choose the investigation that matches the symptom

This page is for a shampoo that matched the brief in development but changed during factory replication. If the main problem is small semi-transparent particles that remain after mixing, our transparent particles in shampoo case review provides the more relevant preparation-record investigation.

For a wider view of how INNO organizes shampoo and body wash discussions, see our formulation support update.

Start an INNO scale-up review with two facts

If your production sample does not match the lab sample, send us two facts: which property changed and whether both samples used the same formula. We can then place the two process sequences beside each other and identify the first records needed for a useful comparison.

Our Shampoo & Scalp Care application page provides the wider formulation context. INNO’s formulation support services cover the route from requirement discussion to sample evaluation.

Discuss my scale-up mismatch

Share the property that changed and whether both samples used the same formula. A process sequence can follow once the mismatch is defined.

FAQ