How should tooling be amortised on an injection molded protective case order of 500?

Answer: Divide the mould cost by the quantity and write that repeats carry no second fee. A 420,000 CNY tool over 500 units is 840 CNY each; charging it again on a repeat means paying twice.

How can I tell whether the regrind ratio in an injection molded protective case quote is too high?

Answer: Check colour and cold impact. Above 25% regrind the natural shade turns grey and bottom corners split first at -25 °C. Keep one virgin part as a reference.

What matters for stacking an injection molded protective case on a 28-day sea leg?

Answer: Three high with corrugated sheets between layers, three turns of film plus two straps. At 60 °C in a shipping box, PP stiffness falls about 10% and a four-high stack leans.

How are payment terms normally negotiated on an injection molded protective case order?

Answer: 40% with tooling, 30% deposit, balance seven days after the bill copy. Price the cash first if full prepayment is offered against a 2% discount.

Injection Molded Protective Case: RFQ Sheet for a -25 °C Dock

Quick answer: Turn a dock-side duty cycle into numbers a factory can quote against: -25 °C to 60 °C, 28 days at sea, three-high stacking. Fix outer size and wall thickness first, then mould ownership at a 500-unit MOQ, a 32-day lead time and payment terms.

Where an Injection Molded Protective Case Quote Starts
MOQ and Mould Ownership: 500 Units vs 3000
Lead Time in Four Blocks
Five Places a Quote Hides Money
Payment Terms, Samples and Factory Audits
Three Hard Lines at Outbound Inspection
FAQ

1. Where an Injection Molded Protective Case Quote Starts

A northern harbour yard is a specific place. Cases come off a container and sit in the open for three days, baking at 60 °C by noon and falling to -25 °C at night.

Duty item	This project	Requirement for the injection molded protective case	What to ask
Temperature	-25 °C to 60 °C	Co-polymer PP, 8% impact modifier	Resin grade
Sea transit	28 days	No rust after 48-hour salt spray	Plating or coating
Stacking	3 high	210 kg on the bottom case	Rib pitch
Outer size	520×380×190 mm	Six per 1200×1000 mm pallet	Pallet modulus?

The size row gets skipped. A 520×380 mm footprint gives two rows of three on a 1200×1000 mm pallet; widen it to 540 mm and only four fit, so freight adds 9 CNY a unit.

That row is worth more than any quality claim.

2. MOQ and Mould Ownership: 500 Units vs 3000

Five hundred units is the usual trial order. With the mould at 420,000 CNY, tooling adds 840 CNY a case at 500 and 140 CNY at 3000.

Injection Molded Protective Case: a wall-high stack of sand-coloured cases in clear film, a dozen more on a pallet, a five-tier yellow rack beside them

Order size	Tooling share	Resin and moulding	Hardware	Unit price
500	840 CNY	64 CNY	28 CNY	932 CNY
1000	420 CNY	62 CNY	26 CNY	508 CNY
3000	140 CNY	59 CNY	24 CNY	223 CNY
5000	84 CNY	57 CNY	23 CNY	164 CNY

Ownership belongs in the contract: who pays, who holds title, and that the moulder is only a custodian. A cavity polish at 200,000 shots is billed at 3000 CNY, so name the payer now. Colour changes cost 90 minutes of cleaning, 1200 CNY flat below 500 units.

3. Lead Time in Four Blocks

Thirty-two days is four blocks, each with its own bottleneck.

Tooling, 18 days: body and lid cut in parallel, then fitted.
First article, 3 days: T1 shot, wall and fit check, one correction.
Production, 9 days: 500 units at a 46-second cycle, two shifts, 4% rework allowance.
Finishing, 2 days: bagging, labelling, palletising.

Only production can be squeezed. Three shifts bring 9 days to 7, but night yield drops two points and the saved days return as rework. Start the clock at first-article sign-off, or a late mould is booked as a late run.

4. Five Places a Quote Hides Money

The shorter the quotation, the more room it has.

Injection Molded Protective Case: white polypropylene resin sacks in the foreground, moulding machines down the gangway, red and black crate stacks beside them

Line	Usual wording	What it means	What to do
Tooling	One-off mould charge	Charged again on repeats	State repeats carry no fee
Regrind	Eco material	25% or more, cold impact halved	Cap the ratio at 10%
Packaging	Packing included	Inner bag only, pallet and film 6 CNY	List pallets and film weight
Hardware	Stainless steel	Grade 201, rust at 48 hours	Specify grade, demand report
Freight	Freight collect	Ex-works price quoted as delivered	Separate the two prices

Regrind is hardest to audit: drop three virgin and three production parts at -25 °C and see which splits first.

5. Payment Terms, Samples and Factory Audits

Split payment three ways: 40% with tooling, 30% on production, balance seven days after the bill copy. Full prepayment for a 2% discount rarely pays.

Charge for samples and state the credit: 800 CNY a set, 500 CNY back against 1000 units. A factory visit needs three checks — tonnage against the nameplate, a mould ledger with maintenance records, regrind bags kept apart.

6. Three Hard Lines at Outbound Inspection

Sample 32 cases at AQL 2.5: dimensions and diagonals, latch force of 55 to 75 N, a 1.2 m six-face drop after four hours at -25 °C, and a 24-hour load at three-high stacking.

Over 3 mm of deflection the batch goes back to the rib layout. Uneven walls never show at room temperature; they show after a day under load.

Conclusion

On a dock-side duty cycle, temperature, stacking and handling belong in the RFQ before price does. Mould title, colour-change charge and regrind ratio are the clauses to put on paper, and a four-block lead time keeps each delay with its owner. Run one cycle this way and an injection molded protective case quote becomes comparable line by line.

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.