Customer-Supplied Formulation Aerosol Filling UK: What You Need to Know
If your business already owns an aerosol formulation, you may not need a manufacturer to develop the product from the beginning. Instead, you may be looking for a UK aerosol contract manufacturer that can review your existing formula, establish whether it is suitable for the proposed pack and move it into reliable commercial production.
This type of project is often described as customer-supplied formulation manufacturing or contract aerosol filling. However, providing a formula does not normally mean that commercial production can begin immediately. The formulation still needs to be assessed alongside the can, valve, actuator, propellant or Bag-on-Valve system, manufacturing process and required finished-product performance.
Hydrokem works with third-party brands requiring aerosol and Bag-on-Valve contract manufacturing. Where a customer already owns the formulation, the project can focus on technical review, component suitability, trial production, testing and the controlled transition into commercial manufacture.
Can an Aerosol Manufacturer Fill My Existing Formulation?
Potentially, yes. If you own an established formulation, Hydrokem can assess it as the basis of a contract manufacturing project rather than automatically developing a new formula.
The first step is to establish whether the formulation is suitable for the intended aerosol or Bag-on-Valve system and whether sufficient technical information exists to reproduce it consistently.
The review can consider:
- complete formulation and ingredient information;
- manufacturing or blending method;
- raw-material specifications;
- target fill weight or volume;
- proposed can and internal lining;
- valve and actuator specification;
- propellant system;
- required finished-product performance;
- existing stability or compatibility information;
- target production quantities and annual forecast.
What Does “Customer-Supplied Formulation” Mean?
A customer-supplied formulation is a formula that already exists before the contract manufacturer becomes involved. In many cases, the brand owns the intellectual property and provides the technical information necessary for another manufacturer to reproduce the product.
There are several common scenarios:
Existing commercial product
The aerosol is already manufactured and sold, but the brand is looking for a new UK manufacturing partner.
Formula developed by the brand
The customer has developed its own formulation and needs specialist aerosol filling and packaging capability.
Formula developed by a third party
A laboratory, consultant or formulation specialist has created the product and it now needs to be transferred into commercial manufacture.
Bulk product requiring aerosolisation
An existing liquid, gel, lotion or other formulation needs to be assessed for dispensing through an aerosol or Bag-on-Valve system.
The amount of work required depends on how complete the existing technical package is and whether the formula has already been proven in an equivalent aerosol system.
What Information Does Hydrokem Need About the Formula?
A formula name or ingredient summary is not normally enough to establish whether a product can be manufactured commercially.
Where available, the technical transfer package should include:
| Information | Why it matters |
|---|---|
| Full formulation | Allows the complete ingredient composition and concentrations to be reviewed. |
| Raw-material specifications | Helps ensure equivalent materials and grades are used during production. |
| Manufacturing method | Defines the order of addition, mixing conditions and other important processing requirements. |
| Bulk specifications | Provides measurable criteria such as appearance, viscosity, pH or other relevant characteristics. |
| Existing packaging specification | Shows how the formulation is currently contained and dispensed. |
| Finished-product specification | Defines the standards the completed aerosol should meet. |
| Testing history | Provides useful evidence about stability, compatibility and previous commercial performance. |
The more complete the information, the easier it is to identify whether the product is a relatively straightforward manufacturing transfer or requires additional development work.
Does Hydrokem Need to Know the Exact Ingredient Percentages?
For commercial manufacture, the manufacturer normally needs sufficient information to reproduce the formula accurately and consistently. An ingredient list without concentrations is unlikely to provide enough information to create an equivalent finished product.
Manufacturing also requires more than a recipe. The processing method can be just as important as the ingredient percentages.
This may include:
- order of ingredient addition;
- mixing time;
- mixing speed where relevant;
- temperature requirements;
- heating or cooling stages;
- hydration or standing periods;
- bulk-product acceptance criteria;
- special handling requirements.
Without these details, two manufacturers could use the same ingredient list but produce materially different bulk products.
How Is Confidential Formula Information Handled?
Formula confidentiality can be commercially important, particularly where the formulation represents a brand's intellectual property or competitive advantage.
Before detailed technical information is transferred, the parties can establish the appropriate commercial and confidentiality arrangements. Brands should also clarify formula ownership before moving production from one manufacturer to another.
This is particularly important where:
- the formulation was originally developed by another manufacturer;
- a third-party laboratory created the formula;
- technical documentation is subject to licensing restrictions;
- specific ingredients or ratios are proprietary;
- the customer intends to use more than one manufacturing location.
A brand should not assume that it owns a formula simply because it currently sells the finished product. Formula ownership and the right to transfer technical information should be established before a manufacturing migration begins.
If you are considering moving an established product, see our guide to switching aerosol manufacturers and transferring production safely.
Can I Supply Bulk Concentrate Instead of the Formula?
Some projects may involve the customer supplying a prepared bulk concentrate rather than asking the contract manufacturer to source and blend the formulation.
That can change the scope of the manufacturing project, but the aerosol filling operation still requires an agreed specification for the supplied material and finished product.
Relevant questions can include:
- how the concentrate will be transported and received;
- what batch documentation accompanies it;
- how incoming material is identified;
- what acceptance criteria apply;
- whether any additional blending is required;
- how long the bulk product can be stored before filling;
- which aerosol components will be used;
- what propellant or Bag-on-Valve filling process is required.
For other projects, Hydrokem can source raw materials and carry out concentrate blending as part of the wider contract manufacturing service.
Can an Existing Non-Aerosol Formula Simply Be Put into a Spray Can?
Not necessarily.
A formulation originally developed for a bottle, pump spray, tube or other packaging format may behave differently when placed inside a pressurised aerosol system.
The manufacturer needs to consider whether the formulation is compatible with the packaging and whether the required dispensing characteristics can actually be achieved.
Viscosity
A formulation may be too thick or too thin for the intended valve and actuator combination.
Material compatibility
Ingredients may interact with can linings, valve seals, gaskets or other product-contact materials.
Dispensing behaviour
The desired spray, mist, foam or stream may require changes to formulation or component selection.
Pressure system
The choice between conventional aerosol and Bag-on-Valve can influence how the product needs to be configured.
Where the formula has never previously been used in an aerosol, some development work may therefore be required before commercial filling.
How Are the Can, Valve and Actuator Selected?
For a customer-supplied formulation, component selection should be based on the formulation and required product performance rather than appearance alone.
The complete system can include:
- aluminium or tinplate can;
- appropriate internal lining where required;
- valve specification;
- gasket and seal materials;
- dip tube;
- actuator;
- spray insert;
- overcap;
- propellant or Bag-on-Valve assembly.
The valve and actuator influence how the formulation leaves the pack, while the can and product-contact materials need to remain compatible with the formulation throughout the intended product life.
Where the customer already has an approved component specification, Hydrokem can review it as part of the transfer. Where components still need to be selected, see our guide to choosing the right aerosol components.
Conventional Aerosol or Bag-on-Valve?
If the formula has not previously been commercialised as an aerosol, the most appropriate dispensing system needs to be established.
A conventional aerosol and Bag-on-Valve system work differently. In a Bag-on-Valve pack, the formulation is contained within a flexible bag and separated from the compressed gas surrounding it. Conventional aerosol systems use a different relationship between the formulation, container and propellant.
The decision can affect:
- formulation requirements;
- propellant interaction;
- spray performance;
- product evacuation;
- component cost;
- filling method;
- product positioning;
- testing requirements.
If the dispensing route is still open, read Aerosol vs Bag-on-Valve: Which Is Right for Your Product?
Will My Existing Formulation Need Compatibility Testing?
It may do, particularly where the formulation is being transferred into a different component system or has not previously been commercially produced as an aerosol.
Compatibility testing is intended to identify interactions between the formulation and the packaging system before large-scale production.
Depending on the product, assessment can consider:
- can or lining interaction;
- corrosion risk;
- valve and gasket compatibility;
- leakage or pack integrity;
- pressure behaviour;
- spray pattern;
- discharge rate;
- product evacuation;
- appearance or formulation changes over time.
Existing stability or compatibility information can be useful, but a change of can, valve or other product-contact material can alter the technical position.
See our guide to aerosol compatibility testing for more detail.
From Customer Formula to Commercial Aerosol Production
A customer-supplied formulation project can typically move through the following stages.
Confidential technical review
Review the existing formulation, intended application, product requirements and available technical documentation.
Manufacturing assessment
Establish how the formulation needs to be prepared, blended or supplied for commercial production.
Component review
Assess the proposed can, valve, actuator and propellant or Bag-on-Valve system.
Gap analysis
Identify missing specifications, unavailable components, technical uncertainties or areas requiring additional development.
Trial production
Produce representative packs where appropriate so the formulation and packaging system can be assessed together.
Testing and approval
Complete the required compatibility, stability, performance and product-specification work.
Commercial filling
Source approved materials, schedule production and manufacture the agreed commercial quantity.
Repeat manufacture
Use approved specifications, component planning and customer forecasts to support ongoing production.
What If Some of My Existing Components Are No Longer Available?
This can happen when transferring an established product. The original can, valve, actuator or other component may have been discontinued, may not be available in the UK or may no longer be commercially appropriate at the required volume.
An alternative component may be possible, but it should not automatically be treated as an identical substitute.
A change can affect:
- material compatibility;
- seal performance;
- spray pattern;
- discharge rate;
- pressure characteristics;
- product evacuation;
- pack dimensions;
- artwork or labelling.
The proposed substitute therefore needs to be assessed technically before routine commercial production is transferred to the new specification.
Can Hydrokem Blend the Formula as Well as Fill the Aerosol?
Where the manufacturing arrangement requires it, concentrate blending can form part of the wider contract manufacturing service.
This can allow the manufacturing programme to bring raw-material sourcing, blending, aerosol filling and secondary packaging into a more integrated production route.
The precise scope depends on the project and the customer's requirements. Relevant considerations include:
- who purchases the raw materials;
- approved material grades and suppliers;
- formula ownership and confidentiality;
- batch size;
- manufacturing instructions;
- bulk-product specifications;
- finished-product specifications;
- testing requirements;
- documentation and traceability.
This type of integrated arrangement can be useful for brands looking to outsource more of the production process rather than transporting prepared concentrate between separate suppliers.
What Determines the Cost of Filling a Customer-Supplied Formulation?
There is no universal aerosol filling price because the commercial cost depends on the complete manufacturing programme.
Important cost factors can include:
Formula handling
Whether Hydrokem blends the concentrate or receives finished bulk product can change the production scope.
Components
Can, valve, actuator, propellant, Bag-on-Valve system and decoration all contribute to finished unit cost.
Production volume
Setup and component purchasing are generally more efficient when spread across suitable commercial quantities.
Transfer work
Trial manufacture, component changes and technical assessment may create one-off costs before repeat production begins.
Testing
Additional compatibility, stability or performance work can be required depending on the existing evidence.
Secondary packaging
Labelling, cartons, multipacks and other finished-goods requirements affect the final commercial specification.
For a fuller breakdown, see How Much Does Aerosol Contract Manufacturing Cost in the UK?
What Quantity Do I Need for Contract Aerosol Filling?
The practical production quantity depends on both manufacturing requirements and the components used for the product.
A customer may want a relatively small initial filling run, but a bespoke printed can, specialist valve or custom actuator can carry its own supplier minimum. As a result, component purchasing requirements can sometimes exceed the proposed first filling quantity.
Hydrokem therefore needs to understand both:
- your expected first commercial production quantity; and
- your realistic forecast annual demand.
The annual forecast provides useful context because components purchased for one production run may potentially support repeat manufacture where the specification remains unchanged.
Our guide to what affects minimum order quantity in aerosol manufacturing explains the relationship between production volume and component MOQ in more detail.
What Does Hydrokem Need Before Discussing a Contract Filling Quote?
A useful initial brief should provide as much technical and commercial information as is reasonably available.
| Information | Examples |
|---|---|
| Product application | What the product does, how it is used and the intended market. |
| Formula status | Existing commercial formula, newly developed formula or bulk concentrate. |
| Formula ownership | Confirmation that the customer has the right to provide the technical information for manufacture. |
| Existing components | Can, valve, actuator, propellant and other approved packaging specifications. |
| Required pack size | Nominal volume and any specific pack dimensions. |
| First order | Expected initial commercial quantity. |
| Annual forecast | Likely ongoing demand and number of production runs. |
| Target market | UK, European or other intended territories. |
| Timing | Required first-delivery or transition date. |
For a full preparation checklist, see our aerosol manufacturing RFQ guide.
When Is Customer-Supplied Formulation Filling a Good Fit?
This route can be particularly appropriate where the brand already has valuable product IP and does not need to start development again from the beginning.
Typical scenarios include:
- a brand bringing aerosol production back to the UK;
- a business changing contract manufacturer;
- a formulation house looking for a specialist filling partner;
- a brand that develops formulations internally;
- a business adding an aerosol format to an established product range;
- a company requiring additional manufacturing capacity;
- a brand looking for aerosol or Bag-on-Valve capability that its current supplier cannot provide.
If the formulation is already proven, preserving the existing product characteristics may be more commercially sensible than unnecessary redevelopment. The emphasis becomes controlled technical transfer and reliable repeat manufacture.
Why Work with Hydrokem for Customer-Supplied Aerosol Formulations?
Hydrokem provides contract aerosol and Bag-on-Valve manufacturing for third-party brands and can work with projects at different stages of development.
For a customer-supplied formulation, the manufacturing programme can include:
- confidential technical review;
- formula and manufacturing-method assessment;
- component review and sourcing;
- concentrate blending where required;
- aerosol or Bag-on-Valve filling;
- trial manufacture;
- testing and quality-control requirements;
- batch coding and traceability;
- secondary packaging;
- commercial repeat production.
If you are looking for a manufacturing partner rather than a formulation-development service, this approach can allow the existing product knowledge to be retained while moving production into a specialist UK aerosol manufacturing environment.
See Hydrokem's contract manufacturing services or contact us to discuss the technical requirements of your existing formulation.
Frequently Asked Questions
Potentially, yes. If you already own an established formulation, Hydrokem can review it as the basis of a contract aerosol or Bag-on-Valve manufacturing project. However, an existing formula does not automatically mean that commercial filling can begin immediately. The formulation needs to be considered alongside the proposed can, valve, actuator, propellant system and intended dispensing performance.
Hydrokem will normally need sufficient technical information to understand exactly what is being manufactured. This can include the full formulation, ingredient concentrations, raw-material specifications, manufacturing instructions, bulk-product acceptance criteria and any existing finished-product specifications. If the product is already commercially manufactured, information about the current can, valve, actuator, propellant and available compatibility or stability testing can also be useful.
The next step is to establish whether the existing specification can be reproduced using the proposed manufacturing route. If the same components remain available and the product is already technically proven, the transfer may be relatively straightforward. If components need to change, the formulation has never previously been aerosolised or important technical information is missing, additional development or testing may be necessary.
The objective is not to reformulate a successful product unnecessarily. It is to establish that the existing formulation can be manufactured consistently and that the complete aerosol system remains technically suitable before committing to commercial production.
If the contract manufacturer is expected to source raw materials, blend the concentrate and reproduce your product, it will generally need sufficient formulation and processing information to manufacture the product accurately. A basic ingredient list is rarely enough because two products containing the same ingredients can perform very differently depending on the concentrations, material grades and manufacturing method used.
The technical package can include ingredient percentages, approved raw-material grades, manufacturing sequence, mixing requirements, temperatures, bulk specifications and finished-product acceptance criteria. These details help ensure that commercial batches are reproduced consistently rather than relying on interpretation or guesswork.
Where confidentiality is a concern, appropriate commercial and confidentiality arrangements can be established before sensitive technical information is exchanged. It is also important for the brand to establish that it owns the formulation or has the legal right to share it for third-party manufacture. This can become particularly relevant when a formula was originally developed by a previous contract manufacturer or an external formulation specialist.
An alternative arrangement may sometimes involve the customer supplying prepared bulk concentrate for filling rather than transferring the formula itself. That changes the production scope but does not remove the need for agreed specifications, identification, traceability and finished-product requirements. The most suitable approach depends on who owns the formulation, where the concentrate is produced and how the complete supply chain is intended to operate.
A project may potentially be structured around customer-supplied bulk concentrate rather than Hydrokem blending the formulation from raw materials. Whether that route is appropriate depends on the product, transport requirements, manufacturing process and the technical controls needed for the finished aerosol.
The supplied concentrate would still need a defined specification. The parties need to know how each batch is identified, what documentation accompanies it, which acceptance criteria apply and whether the bulk material has any particular handling, storage or shelf-life requirements before filling. Hydrokem would also need sufficient information to establish how the concentrate should be filled and combined with the proposed aerosol or Bag-on-Valve components.
Supplying bulk concentrate does not remove the need to assess the finished pack. The product still needs to work with the selected can, valve, actuator and pressure system, and appropriate compatibility, performance or stability work may be required. If the formulation has previously been used successfully in exactly the same packaging system, existing data can be useful during the technical assessment.
For some customers, having Hydrokem source materials and blend the concentrate may offer a more integrated supply route. For others, supplying the bulk product may be commercially or strategically preferable. The correct model should be agreed during the initial technical review so responsibilities, specifications and quality requirements are clear before commercial production begins.
Possibly. The amount of testing required depends on how much existing evidence is available and whether anything about the aerosol system is changing. If the formulation is already commercially manufactured in the same or equivalent pack and there is relevant technical data, that information can support the transfer assessment. However, a change of can, internal lining, valve, gasket, actuator, propellant or other product-contact component may create new technical considerations.
Compatibility testing helps establish whether the formulation and packaging remain suitable together over time. It can look for issues such as corrosion, material interaction, leakage, seal deterioration, pressure changes or changes in product appearance. Performance assessment can also confirm spray pattern, discharge rate, actuator behaviour and product evacuation.
A formulation that has never previously been packaged as an aerosol may require a more extensive assessment. The product may need to be trialled with different components to achieve the required dispensing behaviour, and formulation changes may occasionally be necessary if the original product was developed for a pump, bottle or other non-pressurised pack.
Testing should therefore be proportionate to the technical risk rather than repeated automatically without considering the existing evidence. The purpose is to confirm that the proposed Hydrokem manufacturing specification produces a safe, stable and commercially acceptable finished product before larger production quantities are committed.
Start by establishing what technical information your business owns and has the right to transfer. Ideally, the new manufacturer should receive the complete formulation, manufacturing instructions, raw-material specifications, can specification, valve and actuator details, propellant information, finished-product requirements and relevant historical testing. The more complete the technical package, the easier it is to determine whether the existing product can be reproduced without unnecessary redevelopment.
Component availability should then be reviewed. If the current can, valve, actuator and other materials remain commercially available, the transfer may be able to retain much of the existing specification. If one or more components must change, alternatives need to be assessed because apparently similar aerosol components can produce different compatibility or dispensing results.
Trial manufacture can then provide representative packs produced through the proposed new manufacturing route. These can be assessed against the existing finished-product specification and any appropriate compatibility, stability or performance criteria before routine production begins.
Commercial planning is equally important. The brand should consider existing finished-stock cover, component lead times and the required transition date so that the change of manufacturer does not create an avoidable supply gap. Where possible, the transfer should be validated before the previous manufacturing route is ended. Hydrokem's guide to switching aerosol manufacturers covers the transfer process and continuity-of-supply considerations in greater detail.
Already Have an Aerosol Formulation?
If you own an existing formulation and need a UK aerosol or Bag-on-Valve manufacturing partner, talk to Hydrokem about technical review, components, trial filling, testing and commercial production.
Discuss Your Existing Formulation
