Choosing a filling machine is not only a technical decision. It is a project. The right machine can serve your production line reliably for many years, while the wrong one can mean slow output, high waste, long changeovers and expensive modifications. Often the difference comes down not to the machine itself, but to how carefully the buying process was managed.
Many buyers focus on two numbers: speed and price. Both matter, but neither tells you whether the machine will actually suit your product, fit your line, pass qualification and stay productive for years.
This guide walks through the buying process for a filling machine from start to finish: defining what you need, writing a User Requirement Specification, shortlisting suppliers, testing with your product, comparing total cost of ownership, and managing factory and site acceptance, installation and after-sales support.
If you are still deciding which type of machine you need, start with our guides on choosing a filling machine for your pharmaceutical production line by dosage form, choosing a filling machine for every stage of production and choosing a filling machine for food, cosmetic and chemical lines.
The Filling Machine Buying Process at a Glance
| Stage | Key Output | Common Mistake |
|---|---|---|
| 1. Define needs | Product, container, volume and budget data | Starting with a machine model instead of requirements |
| 2. Write the URS | Clear, written requirements | Vague or missing requirements |
| 3. Shortlist suppliers | Two to four capable suppliers | Comparing too many, or only one |
| 4. Compare proposals | Like-for-like technical and commercial comparison | Comparing price without scope |
| 5. Test with your product | Evidence the machine handles your product | Relying on brochures alone |
| 6. Evaluate total cost | Lifetime cost comparison | Looking at purchase price only |
| 7. Order and design review | Agreed design and documents | Changes late in the project |
| 8. FAT | Machine tested before dispatch | Skipping FAT or testing with the wrong materials |
| 9. Installation and SAT | Machine working on site | Site not ready on delivery |
| 10. Qualification and handover | Machine released for production | Missing documents or training |
The sections below explain each stage.
Stage 1: Define What You Need
Before contacting any supplier, collect the facts about your production. A clear picture of your needs is the foundation of every later decision.
Product Information
- Product type: liquid, viscous liquid, cream, gel, powder, granules or aerosol
- Viscosity and how it changes with temperature
- Behaviour: foaming, dripping, stringing, settling or dusting
- Sensitivity: sterile, oxygen-sensitive, heat-sensitive, corrosive or flammable
- Value of the product, which affects how much loss is acceptable
Container and Closure Information
- Container types: bottles, vials, ampoules, tubes, jars or cans
- Sizes and materials, with drawings or physical samples
- Closure types: screw caps, ROPP caps, stoppers, crimp caps, pumps or sealed tubes
- Labelling requirements
Production Information
- Fill volumes or weights, and the range you will run
- Required output per shift and per year, now and in the future
- Batch sizes and how often you change products or sizes
- Working hours and shift patterns
- Available floor space, utilities and operators
Business Information
- Budget and expected payback period
- Delivery deadline
- Regulatory and quality requirements for your markets
- Plans for future products or capacity
Stage 2: Write a User Requirement Specification (URS)
A URS turns your needs into a written document that suppliers can respond to. It is the single most useful tool in the buying process, because it makes sure every supplier is quoting for the same thing and gives you a reference to check the delivered machine against.
A good URS includes:
- Scope: what the machine or line must do, and where it starts and ends
- Products and containers: full details from Stage 1
- Performance: output, fill accuracy, changeover time and acceptable reject rate
- Construction: materials of construction, surface finish and hygienic design expectations
- Controls: type of control system, recipe storage, user access levels and data recording
- Safety: guarding, interlocks and electrical standards for your country
- Utilities: power, compressed air, nitrogen, water or vacuum available on site
- Documentation: manuals, drawings, material certificates and qualification documents
- Testing: FAT and SAT requirements
- Support: training, spare parts and service expectations
Write requirements clearly, separating “must have” items from “nice to have” items. Avoid naming a specific technology unless you are sure; describing the result you need allows suppliers to propose the best solution.
For a detailed list of features and specifications to include, see our guide to pharmaceutical filling machine specifications and what to check before you buy.
Stage 3: Shortlist Capable Suppliers
Send your URS to a small number of suppliers that are likely to meet it. Two to four is usually enough to get a fair comparison without overloading your team.
What to Look For in a Supplier
| Criterion | Questions to Ask |
|---|---|
| Experience | Have they supplied machines for similar products and containers? |
| Product range | Can they supply the filler and the surrounding machines, if needed? |
| Engineering capability | Can they adapt machines to your specific requirements? |
| Quality and documentation | Do they provide material certificates, manuals and qualification support? |
| Testing | Do they offer product trials and FAT? |
| Support | What installation, training, spare parts and service do they offer? |
| References | Can they share examples of installed machines? |
| Communication | Are they clear, responsive and realistic in their claims? |
A supplier that offers a broad range, such as liquid filling machines, dry powder filling machines, cream and ointment filling machines and ampoule filling machines, can often recommend the most suitable technology rather than pushing a single machine type.
Stage 4: Compare Proposals Like for Like
Proposals rarely arrive in the same format. To compare them fairly, build a comparison table that lists each URS requirement and how each supplier meets it.
Pay close attention to:
- Scope of supply: are change parts, conveyors, documentation, installation and training included, or priced separately?
- Performance claims: what output and accuracy are claimed, for which product, container and fill volume?
- Exceptions: where does the proposal not meet the URS?
- Options: which features are standard and which are extra?
- Delivery time and payment terms
- Warranty terms and what they cover
A lower price often reflects a smaller scope. Make sure you are comparing the same package before comparing prices.
Stage 5: Test With Your Own Product
Brochures and spec sheets describe a machine under ideal conditions. Your product may behave differently. Where possible, arrange a trial with your actual product and containers, or a close equivalent.
A trial can confirm:
- fill accuracy at your fill volumes
- how the product flows, drips or foams
- how containers handle on the machine
- realistic speed for your product and container
- how easy the machine is to set up, clean and change over
If a full trial is not practical, ask for evidence from similar applications and make sure the FAT (Stage 8) uses your product or a suitable simulant.
Stage 6: Look at Total Cost of Ownership, Not Just Price
The purchase price is only part of what a filling machine costs. Over its working life, running costs often exceed the initial price. Total cost of ownership (TCO) brings these costs together.
Costs to Include
- Purchase price and change parts
- Installation and qualification costs
- Spare parts and maintenance over the machine’s life
- Product loss: overfill, spillage, rejects and line purge losses
- Downtime: lost output from breakdowns and changeovers
- Labour: operators needed to run the machine
- Utilities: power, compressed air and other consumables
- Training and support
Illustrative TCO Comparison
The figures below are purely illustrative, in arbitrary cost units, to show how the calculation works. They are not data for any real machine.
| Cost Item | Machine A | Machine B |
|---|---|---|
| Purchase price | 20 | 25 |
| Annual spares and maintenance | 1.5 | 1.0 |
| Annual product loss | 2.0 | 0.8 |
| Annual downtime cost | 1.5 | 0.7 |
| Total over 10 years | 70 | 50 |
In this example, Machine B costs 25% more to buy but has a lower 10-year total because it wastes less product, needs less maintenance and stops less often. Use your own figures for volumes, product value and downtime cost to build a comparison that reflects your situation.
Spare parts are a significant part of TCO. Ask suppliers which parts wear and how often they need replacing, and plan stock accordingly. Our article on vial filling machine spare parts inventory explains how to plan this, and the same principles apply to other filling machines.
Stage 7: Place the Order and Hold a Design Review
Once you select a supplier, confirm the agreed scope, URS compliance, delivery schedule and documents in the purchase order. Then hold a design review to confirm:
- machine layout and footprint
- container flow and transfer to other machines
- change parts for every container and fill size
- control system functions and screens
- utility connection points
- documentation and testing plans
Changes are cheapest at this stage. Changes made after manufacture starts cost more and can delay delivery.
Stage 8: Factory Acceptance Test (FAT)
The FAT takes place at the supplier’s factory before the machine is dispatched. It is your chance to confirm the machine meets the URS while changes are still easy to make.
During the FAT, check:
- construction, materials and finish against the agreed design
- operation at the required speed with your containers and product or simulant
- fill accuracy across your range of fill volumes
- changeover between formats
- alarms, interlocks and safety functions
- documentation completeness
Send people who will run and maintain the machine, as the FAT is also a valuable training opportunity. Agree a list of any open points and how they will be closed before dispatch.
Stage 9: Installation and Site Acceptance Test (SAT)
Prepare your site before the machine arrives: floor space, utilities, access route and any cleanroom requirements. A machine that arrives before the site is ready can wait weeks for installation.
After installation, the SAT confirms the machine works correctly in your facility, with your utilities and connected equipment. It often repeats key FAT tests and adds checks of integration with upstream and downstream machines.
Stage 10: Qualification, Training and Handover
For pharmaceutical applications, the machine must be qualified before routine use. Installation, Operational and Performance Qualification provide documented evidence that it is installed correctly, operates as intended and performs consistently. Our guide to automatic vial filling equipment validation and IQ, OQ and PQ explains the process, which applies to other filling machines too.
Handover should include:
- complete manuals, drawings and certificates
- training for operators, maintenance staff and supervisors
- a recommended spare parts list
- agreed service and support arrangements
Consider the Whole Line, Not Just the Filler
A filling machine works as part of a line. Before ordering, check how it will connect with container preparation, capping, sealing and labelling. Our pharmaceutical machinery guide to building the right line around your filling machine covers this in detail.
In some cases, an integrated solution is the better buy:
- A liquid bottle filling and capping monoblock combines two machines in one frame.
- An automatic liquid vial filling line brings washing, depyrogenation, filling, stoppering and capping together.
Buying from one supplier also simplifies responsibility, documentation and support.
Examples of Matching Machines to Needs
| Need | Example Machine Type |
|---|---|
| Oral syrups in bottles | Automatic liquid syrup filling machine or bottle filling machines for oral liquids |
| Sterile liquid injectables in vials | Automatic servo based vial filling machine |
| Powders in bottles or jars | Auger type powder filling machine |
| Creams and ointments in tubes | Automatic single head tube filling machine |
Common Buying Mistakes to Avoid
- Buying on price alone. A cheaper machine can cost more over its life.
- No written URS. Without it, suppliers quote different things and disputes are likely.
- Overbuying speed. A machine far faster than you need adds cost and complexity.
- Underbuying flexibility. Forgetting future products or container sizes can force early replacement.
- Skipping trials and FAT. Problems found on site are slower and costlier to fix.
- Ignoring the rest of the line. A fast filler with a slow capper gains nothing.
- Forgetting spares and support. A machine waiting weeks for a part produces nothing.
- Late site preparation. Delayed utilities or space delay production.
Frequently Asked Questions
How long does it take to buy and install a filling machine? It depends on the machine’s complexity and customisation. Standard machines may be available sooner, while custom lines take longer. Ask suppliers for a realistic schedule, including FAT, delivery, installation and qualification.
Should I buy semi-automatic or automatic? It depends on your output, batch sizes, labour and budget. Our guide to choosing filling machines for each stage of production explains the trade-offs.
Is a trial necessary? It is strongly recommended for difficult products, unusual containers or tight accuracy requirements.
What documents should I expect with the machine? Typically manuals, drawings, material certificates, FAT and SAT records, a spare parts list and qualification support documents. Agree the list in the URS.
How do I compare suppliers fairly? Use the same URS for every supplier, build a like-for-like comparison of scope and performance, and compare total cost of ownership rather than price alone.
Start Your Filling Machine Project With Harsiddh
Harsiddh Unimach manufactures filling machines for liquids, viscous products, creams, powders, injectables and more, together with the washers, cappers, sealers and labellers that complete a production line. Our team can review your URS, suggest the right technology, arrange product trials and support you through FAT, installation and qualification.
Send us your requirements through our contact page or our inquiry form, and we will help you choose a filling machine that fits your production line today and in the future.