The most unusual asset in die-casting procurement isn’t aluminium ingots, and it isn’t machinery. It’s the mold.
It sits bolted into the supplier’s die-casting machine, but the customer paid for it — or at least believes they did. It has a design life of a hundred thousand shots, but when it cracks at seventy thousand, one side calls it normal wear and the other calls it poor maintenance. When the project ends and the customer wants it shipped back to Europe, the freight bill exceeds the scrap value — and nobody knows whose problem that is.
The strange thing is, most mold disputes aren’t anyone trying to cheat. Both sides signed the contract without realising that four specific questions would later turn into money.
Pitfall one: who pays and who owns
Die-casting mold financing usually takes one of three shapes. Sounds simple. The legal consequences are wildly different.
Customer-funded. The customer pays the full tooling cost. The mold belongs to the customer. This is the most common model, and in theory the cleanest. But “clean” is only theoretical — the moment of ownership transfer is frequently left undefined. Does ownership pass when the tooling invoice is paid? When the T0 trial passes? When PPAP is approved? A new mold from first trial to production sign-off can go through five or six modifications. Every modification gives the customer a reason to hold back final payment. “The mold isn’t approved yet,” they say — while you’ve already sunk months of labour into it.
Supplier-funded. The tooling cost is amortised into the piece price, and the supplier retains ownership. This looks safe — the mold is in your plant, on your machine, and the customer can’t walk away with it. But run the numbers: a large structural-part mold runs into the hundreds of thousands of euros, amortised over several thousand to tens of thousands of pieces. What if the project never hits that volume? What if the customer switches suppliers mid-programme? The unamortised tooling cost sits dead on your books, and the contract says nothing about early-termination tooling compensation. You don’t get that money back.
Split model. The customer pays part, the supplier pays part, and ownership is shared. It sounds fair. In a dispute, it’s the worst of both worlds. Who has the authority to decide whether the mold needs a major repair? Who can decide to move it to another plant? The supplier wants to run similar parts for a different customer using the same mold — is that allowed? The contract is silent, so nothing can be done.
The single most dangerous phrasing: the customer writes “tooling remains customer property” on the purchase order, but the tooling cost is actually deducted in instalments from production part payments. Translation: the customer used your cash flow to buy a mold, and the mold is still theirs. This isn’t fraud — it’s you not having read the clause structure.
Pitfall two: who pays for the trial runs
A new mold from T0 to production sign-off takes at least three to five trial runs. Complex parts can require seven or eight. Every trial run consumes machine hours, melt energy, labour, small repairs, and tool modifications — easily tens of thousands of euros in total.
Customers typically cover the tooling cost itself. But the trial costs? Most contracts contain a single line: “supplier responsible for tooling quality until PPAP approval.” As the supplier, you read that as “I’m responsible for getting the mold right.” The customer’s legal reading is often “every cost related to the mold prior to PPAP approval is yours.”
So the T0 parts come out off-dimension — you pay to correct. T2 shows porosity above limit — you pay to rework the venting. T5 the customer says the surface grain isn’t fine enough — you pay to redo the etching. Every iteration, your money.
What makes it worse is the output lost during trials. Trials don’t just eat machine hours — they occupy a press. That press could have been running production orders, and a day of lost production is opportunity cost. The contract doesn’t mention compensation for production losses during trials — and you can’t even raise it, because the customer will say “you’re the one building the mold.”
Not all trial costs are unreasonable. What’s reasonable is this: agree a trial-run cap in the contract — say, three runs — with the customer covering costs beyond that. Agree the measurement, testing, and customer sign-off timeline for each iteration. Not because anyone is acting in bad faith, but because ambiguity is what breeds disputes.
Pitfall three: mold life, maintenance, and who pays when it breaks
The mold is designed for 100,000 shots. At 70,000, thermal cracking appears in the cavity.
Is this normal life consumption? Or did a blocked cooling channel cause hot spots because you didn’t maintain it properly? The customer points to the contract: “supplier to maintain tooling in good working condition.” What does “good working condition” mean? The contract doesn’t say. Your tooling engineer looks at the crack and says it’ll run another 20,000 shots. The customer demands an immediate major repair — tens of thousands of euros. Who pays?
This isn’t even the worst case. The worst case is the mold failing in the middle of a production run. Your line is waiting on this mold. The customer’s assembly line is waiting on your parts. The repair will take two weeks. The customer says “I don’t care, deliveries don’t stop.” You arrange emergency air freight to cover the gap — the freight bill eats a quarter’s profit. You open the contract. The maintenance standard section is blank. You weren’t not maintaining it — you were maintaining it to your own experience. But the contract didn’t codify that, so when things go wrong the customer says you didn’t do enough.
A workable version: put a scheduled maintenance interval in the technical agreement annex — cavity inspection every 20,000 shots, for example — with the scope and cost responsibility stated. For unscheduled damage, agree the response procedure: who assesses the damage, who bears the repair cost, and what the delivery contingency plan is during repair downtime. All of it in the contract.
And then there’s the end of the mold’s life. One clause almost everyone forgets: who decides the mold is beyond repair, and who owns the scrap value. The mold reaches its design life, or the damage is so severe that repair costs more than a new tool. Who has the authority to say “this mold is done”? Once it’s scrapped, the tool steel alone weighs several tonnes — the scrap value isn’t pocket change. Whose money is it? Nobody’s generic terms and conditions cover this. But for a large die-casting mold, it’s a real number.
Pitfall four: when the relationship ends — what happens to the mold
No business relationship lasts forever. The project gets cancelled. The supplier is switched. The customer goes insolvent. In all three scenarios, the mold has to be dealt with.
The customer wants it shipped. The contract says “mold is customer property, supplier to facilitate shipment within 30 days.” Who pays the freight? A large mold weighs several tonnes — packing, sea freight, and European inland trucking add up to tens of thousands. The customer says “you didn’t write freight into the tooling cost.” You say “then you pay.” The customer invokes the contract clause: “you’re not cooperating with the handover.” The mold sits in limbo — not valuable enough to litigate internationally, not cheap enough to write off.
You want to hold onto it. The classic scenario: the customer hasn’t paid for the last shipment. You have their mold. Your instinct says “no payment, no mold.” Legally, these are two separate things. Mold ownership is a property right. Unpaid invoices are a debt. You withholding the mold is conversion of someone else’s property. The customer not paying is breach of contract. Mix the two together, and you’re the one who gets hurt.
The customer goes bankrupt. Whoever legally owns the mold — that’s whose insolvency administrator takes control. If the contract says the customer owns it, the administrator comes for it, and you can’t refuse — even if you just finished a major repair at your own cost. If the contract includes a pre-agreed supplier’s lien, you can hold it until outstanding amounts are settled. That’s why these four questions have to be answered in the contract — not so you can fight, but so you don’t have to panic when the fight comes.
Before you sign: eight things to lock down
This is not legal advice. It’s a checklist of eight things you must get onto paper when signing a mold contract with a European customer.
- Ownership and the transfer moment. Does ownership pass on payment, or on PPAP approval? Pin it to a specific event — don’t leave it as “when the mold is approved,” which is subjective.
- Trial-run cap and cost responsibility beyond it. Agree the number of free trials. Agree who pays for machine hours, material, and modifications on trials beyond that cap.
- Production-loss compensation during trials. If trials occupy a production press beyond X hours, does the customer compensate the opportunity cost? Even a small compensation formula is better than having no basis to raise it later.
- Scheduled maintenance interval and standard. How many shots between cavity inspections? Who pays? What’s the delivery arrangement during maintenance? Put it in the technical agreement annex.
- Unscheduled damage assessment and cost split. Who determines the extent of damage? Who bears the repair cost? What’s the delivery contingency during repair? Write it down.
- End-of-life criteria and scrap-value ownership. Who decides the mold is beyond repair? Who pays for disposal? Who gets the scrap steel value?
- Early termination tooling compensation. If the customer cancels the project or switches suppliers — how is your unamortised tooling cost settled?
- End-of-relationship mold disposal. Who arranges transport? Who pays freight? Does the supplier have a lien right pending settlement of outstanding amounts? Put it in the main contract, not just confirmed over email.
From negotiation to signing, a die-casting mold contract typically takes months. These eight points, however — sitting down and thrashing them out once takes an afternoon at most. The difference is that one approach leaves you flipping through the contract with no answers when things go wrong. The other means the contract is the answer.