Quick answer: Buying from a Plastic Boxes and Cases OEM/ODM Factory rests on three terms: a six-line quote, MOQ split by tooling, and 65 days to a first batch, 18 on repeat orders.
Table of contents
- How a Plastic Boxes and Cases OEM/ODM Factory Splits Responsibility
- The Six Lines Every Quote Should Show
- How MOQ Is Multiplied from Three Variables
- Sampling and First Article Approval
- Lead Time, Partial Shipments and the Factory Audit
- FAQ
1. How a Plastic Boxes and Cases OEM/ODM Factory Splits Responsibility
OEM: the buyer issues drawings, the plant cuts the tool and moulds to them. ODM: the plant owns the geometry, the buyer changes colour and liner.
The gap is structural risk, not machining cost. One OEM dimension change needs a change note and 12 days to re-cut an insert; an ODM colour change releases on one sample sign-off. Fix who changes structure, who holds the tool, who rules on disputes.
| Item | OEM | ODM |
|---|---|---|
| Structure | Buyer draws, plant advises | Plant designs, buyer approves |
| Tooling | New tool, quoted in full | Insert change only |
| Ownership | Buyer's once paid | Stays in plant |
2. The Six Lines Every Quote Should Show
A Plastic Boxes and Cases OEM/ODM Factory quotes six lines, starting with P20 tooling at about CNY 86,000 for one cavity, CNY 124,000 for two, CNY 180,000 with a slide core, rated at 300,000 shots. A 1.9 kg PP body on a 650-tonne press at 95 seconds uses about CNY 17.9 of resin; hardware and printing add CNY 4.
| Line | Basis | Buyer checks |
|---|---|---|
| Tooling | Cavity count and slides | Trials, repairs, relocation |
| Unit price | Shot weight times resin | Resin index clause |
| Post-processing | Per piece | Who pays rework |
| Inspection | Per man-day | AQL and sample size |
| Amortisation | Upfront or per unit | Ownership after payback |
Amortisation hides money: the same CNY 86,000 tool is CNY 1.72 per piece over 50,000 units and CNY 0.43 over 200,000. Pay it upfront, or write a CNY 1.3 step-down after 50,000.
3. How MOQ Is Multiplied from Three Variables
Colour, material and tool ownership multiply. A colour change burns 40 minutes of purging and 12 kg of compound, about 900 pieces, so each colour is a separate start-up.
Natural PP starts at 3,000 pieces; a V0 or antistatic grade needs 5,000, sold in 25 kg bags with slower purging. Existing tooling with a masterbatch swap allows 500, but a new tool only pays back from 5,000. A Plastic Boxes and Cases OEM/ODM Factory is asked this most often.
Cutting MOQ is a design exercise: one tool across three sizes, five colours cut to two.
4. Sampling and First Article Approval
A prototype costs CNY 2,800 in 7 days; T1 arrives 28 days after kick-off with 5 pieces at plus or minus 1.5 mm on the diagonal.
First article approval rules the order: 8 pieces, 12 critical dimensions covering cavity depth, latch centres, lid flatness and wall thickness, three signed sets. Then a 200-piece pilot through 50 latch cycles, 30 lid openings and a 1.2 m six-face drop.
5. Lead Time, Partial Shipments and the Factory Audit
The first order runs 65 days including tooling; a repeat with stock tool and resin takes 18 days, plus 12 for a modified grade.
| Milestone | Days | Deliverable |
|---|---|---|
| Tool to T1 | 28 | 5 samples, dimension report |
| Correction to T2 | 12 | 5 samples, repair log |
| First article | 3 | FAI report, three signed sets |
| Pilot run | 9 | 200 pieces, assembly record |
| First batch | 13 | 15,000 pieces, inspection |
Partial shipment belongs in the contract: 45,000 a month in three lots of 15,000 by sea, against capacity of 450,000 a month. Audit five records: press tonnage, tool register, drying logs, first article sheets, finding closure.
Conclusion
Buying plastic boxes is a comparison of terms, not unit prices. Split the quote into six lines, negotiate MOQ against colour and tool ownership, and break the schedule into milestones. Once tool ownership and the signed first article sit in the contract, most disputes never start, and the Plastic Boxes and Cases OEM/ODM Factory answers on conditions rather than price.
This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.
Related Reading
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- How to write an enquiry that returns comparable quotes
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- Trial moulding and how T1 samples are judged
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