For many brand owners, the mold is the most valuable physical asset in their supply chain. A multi-cavity LSR mold with a valve-gate cold runner is a significant investment and can take many weeks to build.
Yet many OEM buyers sign purchase orders that say little more than “tooling cost: paid by customer”. When something goes wrong, such as a price dispute, quality problem or plan to move production, they find out that paying for the mold and controlling it are not the same thing.
This article covers the clauses that should be clear before steel is cut.
Note: This is general commercial guidance, not legal advice. Laws differ by country, so have important contracts reviewed by a qualified lawyer.
Most disputes do not start with bad intentions. They come from unclear terms:
If the contract does not answer these questions, each party will answer them in its own favor.
State clearly who owns the mold, and when ownership transfers.
| Payment Model | Typical Ownership Position | What to Clarify |
|---|---|---|
| Full payment by buyer | Buyer owns after final payment | Date of transfer; status during build |
| Partial payment + amortization | Often disputed | Ownership share; buy-out price for the remainder |
| Fully amortized in part price | Often the molder until amortization ends | Quantity at which ownership transfers |
| Molder-funded | Molder | Whether buyer can buy it out, and at what price |
Amortized tooling causes the most disputes. If you choose it, define the exact part quantity after which the mold becomes yours, and the buy-out price if you leave early.
Owning the steel is not enough if you cannot reproduce or repair it. Specify that the buyer receives, or has the right to receive:
Also define who owns improvements made during trials or production.
Require the mold to carry a permanent nameplate with the owner’s name, mold number and cavity count. It sounds minor, but in a factory with hundreds of molds it prevents confusion and supports your claim during a transfer.
While the mold is at the molder’s site, the contract should state:
Separate the categories clearly:
| Type of Work | Usually Paid By | Notes |
|---|---|---|
| Routine maintenance (cleaning, vents, seals) | Molder | Often included in part price |
| Repair due to molder’s misuse | Molder | Define what counts as misuse |
| Wear after guaranteed shot life | Buyer | State the guaranteed shot count |
| Engineering changes requested by buyer | Buyer | Quote and approve before work starts |
Define the guaranteed mold life in shots and the required maintenance records. For LSR molds, include vent cleaning, parting-line condition and valve-pin wear, as these directly affect flash and part quality.
This is the clause most buyers wish they had written carefully. Include:
LSR molds have features that make transfers harder than for many plastic molds:
A mold that is legally yours but cannot run elsewhere without weeks of re-engineering is only partly yours.
When evaluating a mold maker or OEM molder, look for:
A clear tooling agreement protects both sides. The buyer gets certainty about an important asset, and the molder avoids disputes that harm long-term relationships. Settle ownership, data rights, storage, maintenance and transfer terms before the mold is built.
TYM designs and builds LSR molds in-house and provides OEM molding with documented tooling terms, mold nameplates and maintenance records. Contact our team if you want to review tooling terms for your next project.
