Can the factory pay for the mould on OEM custom plastic boxes?

Answer: Yes, at eight to fifteen percent on the unit price, title staying with the factory. Add a top-up clause for short volumes.

Will a supplier quote from a 3D model alone?

Answer: Yes, as a floating price. Without a 2D sheet the factory sets its own tolerances and thickens walls.

Who produces the first article report?

Answer: The factory does, inside the trial-shot fee. A third-party report is billed separately.

Who absorbs a delay caused by a change?

Answer: The party that asked for it. A buyer change pushes the date and pays mould work; a factory change does not.

What happens when a lot fails acceptance?

Answer: Grade the defect. Critical returns the lot, major allows one rework pass, minor is accepted with a price cut.

How do you protect the drawing itself?

Answer: Number every issued copy, log its return, refuse to run the same mould for others, shred scrap parts.

OEM Custom Plastic Boxes Made to Drawing: Clauses to Sign First

Quick answer: OEM custom plastic boxes are built to a buyer's drawing, so the price is only as stable as the paperwork behind it. Freeze the drawing revision, the tooling title, the first-article list and the change rule before you negotiate.

OEM Custom Plastic Boxes: What the Drawing Package Must Contain
Reading the First Article Inspection Report
Tooling and Fixture Ownership in the Contract
Running an Engineering Change Through the Line
Acceptance Clauses That Survive an Audit
Four Costs Missing From the Quotation
FAQ

1. OEM Custom Plastic Boxes: What the Drawing Package Must Contain

A drawing set is not a CAD file. The buyer hands over a STEP AP214 solid for shape, a 2D sheet for the dimension chain, and an appearance note covering colour and flame rating. Only then does a factory quote a firm number.

Tolerances are where buyers lose money. Untoleranced features fall under ISO 2768-m, but shrinkage needs a callout: on a 600 mm case the ends drift 0.2 mm after cooling. Give the seal groove, hinge seats and latch roots their own bands.

The schedule belongs here too: freeze date, five working days for feedback, eighteen days to first sample. After that, changes go through a form, not a call.

Stage	Buyer signs off	Judged against	Owner
Drawing	STEP solid, 2D sheet, colour list	ISO 2768-m	Buyer
Tooling	Cavity drawing, trial records	Eight-point sheet	Payer
Acceptance	First article, test records	MIL-STD-810H 512.6	Filed 3 years

2. Reading the First Article Inspection Report

A first article report is not a certificate. It is a line-by-line comparison sheet with signatures; a supplier who cannot produce one left no data.

OEM custom plastic boxes: ivory cases on a dark bench, the nearest angled, a pressure valve beside the folded handle

A usable report carries measured values, not ticks:

Fourteen critical dimensions on a CMM
Wall thickness, nine points, minimum 2.8 mm
Lid gap a 0.15 mm gauge cannot enter
Hardware at 2.5 N·m, re-checked
Handle at 30 kg for ten minutes
500 open-close cycles
Colour within ΔE 1.5
Dropped 1.2 m on six faces
Salt spray 72 hours, no red rust

The header names the inspector, the machine and the out-of-tolerance rule.

3. Tooling and Fixture Ownership in the Contract

Whoever pays for the tool on OEM custom plastic boxes owns it. Put that in the contract body, not an appendix.

Three lines do the work. The fixture list is an annex, numbered tool by tool. Title passes on payment, and the factory keeps custody only, never running that mould for anyone else. On termination the buyer gives seven days' notice.

Fixtures are what buyers forget: foam trim dies, screen frames and plug gauges cost 3,000 to 9,000 yuan each.

Cost line	Amount	Owner	Repeats
Cavity mould, one impression	90,000 to 140,000 yuan	Buyer	No
Foam trim die	3,000 to 6,000 yuan	Buyer	No
Gauges and plug gauges	2,000 to 5,000 yuan	Buyer	No

Mould life runs about 300,000 shots. Wear repairs sit with the factory; revision-driven cavity changes with the buyer.

4. Running an Engineering Change Through the Line

A change order carries four fields: change number, affected mould area, effective lot, and who pays. If one is blank, do not sign.

OEM custom plastic boxes: ivory cases queued on an aluminium conveyor, scuffed lids in front, machine tools blurred behind

Every change sits behind a thirty-day freeze; orders inside it ship to the old revision. The freeze is the time to cut a cavity, re-make a trim die and reprint packaging, twelve days at best.

Price changes apart. Print copy, colour and foam grade are small, billed as sampling and cleaning time. Wall thickness, parting line and latch geometry are large, billed from 10,000 yuan. The first fifty units after a change are inspected in full.

5. Acceptance Clauses That Survive an Audit

Never write per sample as the acceptance basis for OEM custom plastic boxes. Samples age; a clause does not.

Use three levels: document, clause, sub-clause. Q/JZ 02-2026 clause 4.3.2 points to chapter four, section three, item two, held by both sides. The year sits in the number, so a revision retires the old basis.

External standards need the designation plus the method number: IEC 60529, where six means dust-tight and seven means immersion at one metre for thirty minutes; MIL-STD-810H 516.8 for shock, 512.6 for immersion, 509.7 for salt fog.

6. Four Costs Missing From the Quotation

Quotations for OEM custom plastic boxes often fold trial shots, fixtures, packaging and reports into the unit price, then bill them later. Packaging alone runs three to eight yuan per case, 4,000 yuan across 500 pieces.

Minimum order quantity follows cavity count: 500 pieces on a single impression, 300 on a double. Lead time runs twenty days of toolmaking, twelve of trials, fifteen of production, forty-seven in total. Payment reads thirty against seventy, ten percent held for a year.

Conclusion

The price of OEM custom plastic boxes reflects how clearly three documents are written: the drawing, the tooling title and the acceptance basis. A complete drawing leaves no room for contingency pricing, and a clause number gives a dispute a referee. What a buyer negotiates is never the price alone, but OEM custom plastic boxes deliverables that can be executed.

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.