Conclusion: Ask "How Many Units?" and the Answer Will Always Be Off
If you answer "from X units" when asked about the minimum lot for cosmetic OEM, a discrepancy will always arise later. The reason is simple: the minimum lot for cosmetics is not set by unit count but by the production lot of the fill in kilograms.
In practice, around 50 kg of fill is commonly the realistic starting point. This comes from the minimum batch volume of the emulsifying and mixing equipment; below it, mixing does not become uniform and viscosity and appearance tend to vary between lots.
The accurate answer is therefore determined in the following order.
Minimum production lot of the fill (kg)
↓ divide by the fill volume
Indicative unit count
↓ compare against the minimum lots for the container and carton
Effective minimum lot (the largest of the three)
1. Why Unit Count Does Not Decide It
The production equipment has a minimum batch
Emulsifying equipment mixes more efficiently with a certain volume in it than filled to capacity. Orders below the equipment's minimum batch volume cannot be accepted in the first place, because quality stability cannot be assured — that is the practical constraint.
Filling loss always occurs
Not all of the fill that is produced becomes product. Several percent is lost to residue in the piping, initial loss at the filling machine, and sampling for testing. Producing 50 kg does not mean 50 kg of finished product.
Containers and cartons run on separate lots
The factory that makes the fill, the factory that makes the container and the factory that prints the carton are different. There are therefore three separate minimum lots. Unless all three align, the product is not complete.
2. Converting 50 kg into Unit Counts
Depending on the fill volume per unit, the same 50 kg produces very different unit counts.
| Fill volume per unit | Theoretical unit count | Indicative count allowing for filling loss |
|---|---|---|
| 30 g | Approx. 1,670 units | Approx. 1,580–1,620 units |
| 50 g | Approx. 1,000 units | Approx. 950–970 units |
| 100 g | Approx. 500 units | Approx. 475–485 units |
| 150 g | Approx. 330 units | Approx. 315–325 units |
| 200 g | Approx. 250 units | Approx. 235–245 units |
The formula is 50,000 g ÷ fill volume per unit. The loss rate is taken as 3–5% for indicative purposes.
What matters here is that there is a direction available: to make the minimum lot smaller, make the fill volume per unit smaller. With the same 50 kg, a 30 g serum gives around 1,670 units while a 200 g cream gives around 250 units. If you want to start with a small lot, designing the fill volume has a direct effect on the quantity.
3. Container and Carton Lots Are Separate
Containers
| Container type | How the minimum lot works |
|---|---|
| Stock container (standard item) | Often set relatively small. Varies with colour and whether printing is used |
| Stock container plus overprinting | A printing process is added, so a lot arises at the printing unit |
| Dedicated container (new mould) | The mould cost arises separately, and the minimum lot often exceeds that of the fill |
Cartons
A carton is a printed item, so the lot is decided by the plate-making unit. When a new plate is made, a quantity based on using that plate up is generally requested. Conversely, where an existing plate can be reused, quite a small lot may be possible.
The effective minimum lot is the largest value
Fill lot: 50 kg → 100 g × approx. 500 units
Container lot: 3,000 units and up
Carton lot: 5,000 sheets and up
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Effective minimum lot: the equivalent of 5,000 units
In this way, the largest lot decides the whole. Making only the fill smaller is meaningless if the carton lot is large. That is why the three lots must be laid side by side and checked first.
Note: the figures given here are examples to illustrate the way of thinking. The actual minimum lot varies with the formulation, the container shape, the printing method and the factory's equipment. Please confirm on a case-by-case quotation.
4. Four Ways to Start with a Small Lot
If you want to reduce the minimum lot, considering the following in order is realistic.
Method 1: Stock container plus original carton
This is the most approachable combination. Using a stock container avoids the mould and the container lot, while the carton and label carry the brand feel.
Method 2: Start from finished goods plus Japanese labels
Use finished goods for both the fill and the container, and make only the Japanese label and package to your own specification. This is not OEM, but it is the lowest-risk means of market validation. Once there is a response, you can move to a dedicated formulation.
Method 3: Split one batch across multiple SKUs
Fill one 50 kg batch of the fill into two or three SKUs differing by colour or fragrance. A single production run yields several products, which makes an initial line-up easier to assemble. However, changeover loss arises, and the container and carton lots for each SKU arise separately.
Method 4: Limit the first order to one SKU
This is the opposite approach, but it has the highest success rate. Narrowing to one strong candidate and making that one product properly produces faster learning than spreading several SKUs thinly.
5. Common Misconceptions
| Misconception | Reality |
|---|---|
| "They said 50 kg, so we get 50 kg of product" | There is filling loss, so the actual unit count is several percent lower |
| "The container can be made in the same lot as the fill" | Containers and cartons come from different factories. The lots are separate |
| "A smaller lot means the unit price falls proportionally" | Set-up costs arise regardless of quantity, so the unit price rises as the lot gets smaller |
| "If the sample is good, mass production will be the same" | Samples are sometimes made by hand; the conditions differ from mass production |
| "The minimum lot is the same everywhere" | It varies with equipment, process and timing. Even for the same item it must be confirmed per quotation |
Frequently Asked Questions
Q. How many units is the minimum lot for cosmetic OEM? A. It is decided not by unit count but by the minimum production lot of the fill. In the industry, around 50 kg of fill is the common indicative figure. The unit count changes with the fill volume; for 50 kg, around 1,670 units at 30 g and around 500 units at 100 g are indicative. Actual conditions vary with the formulation and the equipment, so we quote on a case-by-case basis.
Q. Can you produce a trial run of just 100 units? A. Manufacturing to a dedicated formulation is difficult in most cases. We propose validating the market first by combining finished goods with a Japanese label or an original carton, then moving to a dedicated formulation once there is a response.
Q. If we reduce the fill volume per unit, can we increase the unit count? A. Yes. For the same weight of fill, the smaller the fill volume per unit, the greater the unit count. However, the container and carton lots are separate, so the overall minimum lot is decided by comparison with those.
Q. Can the container or carton lot alone be reduced? A. It may be possible to reduce them where a stock container and an existing plate can be used. Where a new mould or new plate-making is required, a lot arises at each of those units.
Q. On a repeat order, is the same minimum lot required again? A. On a repeat order the development support fee does not arise again, but the way the production lot works is unchanged. Production proceeds on the previous specification as the baseline, after rechecking raw material lots and unit price movements.
Summary
- The minimum lot for cosmetic OEM is set not by unit count but by the production lot of the fill in kilograms
- In the industry, around 50 kg of fill is the realistic starting point. The unit count varies greatly with the fill volume
- Container and carton lots are separate. The effective minimum lot is the largest of the three
- To start small, begin with a stock container plus an original carton, or finished goods plus a Japanese label
About the author
itsushou — China OEM & Product Development, GAMU Involved in product development, OEM production and factory coordination in China, publishing information on China OEM based on hands-on experience.
Related reading
- The Full Cosmetic OEM Process in China｜Formulation, Container, Packaging, Inspection
- Cosmetic Packaging Sourcing: Bottles, Pumps and Print
- Custom Packaging Brief Guide: Materials, Structure & Prepress Proofing
- OEM & Product Development Support
- Pricing & Payment
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