USA skincare brand: 15–50 ml PETG serum dropper
A serum line that needed glass-like clarity in a container light enough for parcel shipping. The programme ran from a mold search to a third reorder inside eighteen months.
PETG, 15–50 ml, sampled in eight days
The requirement was a premium serum bottle with the look of glass, at a shipping weight that would not arrive broken and a unit cost that a serum price point can carry.
Material: PETG, chosen for glass-like clarity at a fraction of the weight of glass.
Sampling ran 8 days. The first order was 12,000 pieces, and the programme has since been reordered three times, reaching 68,000 pieces over 18 months.
The client name is withheld under the confidentiality agreement in place. The engineering record below is published in full.
Project record
Structured fields rather than a narrative, so this page can be read the same way by a buyer and by a search engine.
USA skincare brand — PETG serum dropper
How the programme ran
The stages below are the ones that mattered on this project. Each is a point where the buyer had something to approve or something to decide.
Quality control on this programme
The checks below are the ones this project ran against. They are the same gates every programme runs through; what changes between projects is the tolerance that matters most.
| Gate | What happened on this project |
|---|---|
| IQC | Incoming PETG resin checked and the supplier batch logged against the specification. |
| IPQC | Wall thickness measured at four points per cavity, weight held within ±2%, visual defect inspection every 30 minutes in process. |
| OQC | AQL 2.5, a 1.2 m drop test, and air-pressure leak testing on every closure assembly. |
| Assembly | Dropper collar and bottle torque tested as one unit before packing. |
| Records | A QC report per lot, plus retained samples so the third reorder could be compared against the first. |
ISO 9001:2015 is the certification Shijin holds. Test reports and material declarations are issued as documents on request — they are evidence, not certifications. The distinction matters when your own regulatory filing is being prepared.
Products this project drew on
These are real Shijin items in the same material and size band. Specifications are the published ones — a serum programme is quoted against your own drawing, capacity and artwork.
SJE-1667-15 — 15 ml PETG bottle
A 15 ml PETG bottle in the same thick-wall family, compatible with a dropper cap, lotion pump or screw cap.
Read more →SJE1683-100 — 100 ml PETG bottle
The next size up in the PETG range, 18 mm neck, with the same closure options and finish treatments.
Read more →SJT0405-30 — 30 ml dropper bottle
A 30 ml dropper bottle for serum and essential-oil applications, supplied with a dropper cap for drop-by-drop dosing.
Read more →Material, engineering and further reading
A serum dropper programme touches material selection, neck and closure compatibility, colour matching and decoration. These pages cover each in depth.
Questions this project raises
Why PETG rather than glass for a serum bottle?+
Glass gives the clearest premium look but it is heavy and it breaks in transit, which shows up as damaged-goods cost rather than as a packaging line item. PETG gives a thick-wall, glass-like clarity at a fraction of the weight, and it survives parcel handling. The trade-off is a lower heat ceiling than PET, so the fill temperature has to be agreed first.
What heat can a PETG serum bottle take?+
PETG is normally worked in a window around 70–75 °C, which is below the range standard PET takes. If your formula is filled hot, that constraint decides the material before anything else does. Send the fill temperature and the dwell time and it can be checked against the real specification.
Will a 15 ml and a 50 ml bottle look like the same product family?+
Only if the proportions are designed together. Diameter, shoulder radius and neck finish have to scale as a set, and the decoration position has to be set per size rather than reused. This is what the design stage on a multi-size range is for.
How long does sampling take on a project like this?+
Sampling on this programme ran 8 days. Sampling from an existing mold typically runs 3–10 days; where decoration has to be mounted, or where a new tool has to be cut first, the round takes longer and is scheduled separately.
Can the dropper be sourced together with the bottle?+
Yes, and on this project it was. The dropper collar and the bottle are tested as one assembly — thread engagement, torque and leak performance — so the seal is our responsibility instead of being a dispute between two suppliers if something fails.
What order quantity does a programme like this start at?+
The first order on this project was 12,000 pieces. Minimum order quantity depends on the mold and the closure: standard orders start at 5,000 pcs in white, black or natural, or 10,000 pcs for custom colours, and custom accessories follow the same rule.
Can I see the mold record for this project?+
The client-specific record is not ours to publish. What we can share with a prospective buyer is the same engineering sequence applied to your drawing: the mold search result, the sample round, the inspection gates and the test reports that travel with the shipment.
Is PETG recyclable?+
PETG is a PET-family polyester and is collected in some streams, but it is not accepted in every municipal PET stream and it is not the same resin as bottle-grade PET. If recycled content or recyclability is a requirement in your market, it is worth deciding that before the material is chosen rather than after.
Discuss your packaging project
Send the capacity, the material you are considering and the quantity you expect. Engineering replies within one business day.
Part of Custom Packaging Projects for Global Brands | Shijin
Keep reading
Material, engineering and buying pages that this one sits next to.