Reordering Custom Silicone Molds: Lock the Revision Before the PO

A repeat mold order needs a defined approved version, not just “same as last time.” Link the purchase order to the drawing, master, material specification and accepted sample that describe the same design. If any of those conflict, resolve the conflict before authorizing production.

The decision about when worn molds need replacement is different from controlling what gets made next. This guide focuses on that second question: how to preserve the approved design when placing a repeat order or requesting a small change.

Decide whether this is a repeat order or a design change

A different logo, a deeper cavity or a new support tray can look like a minor purchasing note. Each can affect the result you previously approved. Separate the requested changes from the quantity and delivery instructions.

Order type	What to confirm	Approval needed
Exact repeat	Same released revision, material and interface; retained references remain usable	Written reference confirmation and the agreed delivery checks
Repeat with a change	A listed change and its effects on geometry, use and documentation	New revision and agreed validation of affected requirements
Reconstruction	Records are incomplete, or only a worn mold or casting remains	Re-established drawing and sample acceptance before calling it a repeat

An exact-repeat request does not guarantee that a usable master still exists. Ask the supplier to confirm the retained reference and its condition. Storage duration, ownership and reuse terms should come from the actual project agreement, not assumptions based on an old invoice.

Create one approval baseline

The baseline is the set of records that defines the accepted mold. Keep it small enough that both buyer and supplier can identify it without searching a long email thread.

1. Product identity: buyer SKU, supplier project reference and intended casting application.
2. Released geometry: dimensioned drawing, CAD filename, revision and units. Include the cavity layout and orientation where relevant.
3. Material requirement: the agreed specification or controlled reference, including approved color and relevant use conditions.
4. Physical references: accepted mold or casting IDs, photographs and the purpose of each reference.
5. Acceptance record: approved measurements, appearance limits, functional trial and any accepted exceptions.

Different references answer different questions. A finished chocolate bar may establish logo appearance. It cannot by itself establish the tray's nozzle pitch. A mold may show the split structure while its flexible dimensions depend on how it is supported. State which reference controls each requirement.

If the approved drawing says one thing and the retained sample shows another, do not choose whichever is easiest. Ask the designated approver to resolve the discrepancy and record the decision. A sample accepted with a documented exception should not silently redefine every dimension in the drawing.

Worked example: “same tray, updated logo”

This is a fictional workflow example, not a customer case. Suppose a buyer has an accepted multi-cavity mold at Rev A. The next order adds a revised logo but must retain the piece envelope and cavity positions.

The request should list both the intended change and the requirements to preserve:

• Change the logo from artwork A to artwork B, identified by filename and issue date.
• Preserve the approved finished-piece envelope and cavity-center layout.
• Review whether the revised relief changes cavity volume, fill behavior, release or legibility.
• Retain the agreed material and carrier interface unless a separate change is approved.

Rev B then needs a real-scale artwork review and whatever trial the affected requirements require. If weight matters, recheck weight with the intended casting material. “Only a logo change” is not sufficient evidence that volume and release are unchanged.

Keep the Rev A release record. Mark it as superseded for new production if that is the decision, but preserve its identity for older stock, complaints and deliberate repeat orders. Do not rename the new file “final-final” while leaving two indistinguishable masters in circulation.

Use a short change record with a clear release decision

Field	Example entry format
Request	Change ID, requester and date
Starting point	Current released drawing and physical reference IDs
Change	Feature, reason and exact replacement file or specification
Impact review	Geometry, volume, release, support, equipment fit, material and documentation
Validation	What will be inspected or trialed, by whom and against which limits
Release	Approved revision, approver, date and first applicable PO or batch
Old stock	Use separately, hold, rework or another explicitly agreed disposition

The key question is not whether a change has a large or small cost. It is whether the changed feature affects something that was previously accepted. Match the validation to that effect rather than demanding a full new program for every administrative correction.

When the only reference is a worn mold

A used mold is evidence of its current condition, not automatically of the original design. Tears, permanent deformation and worn lettering can become copied defects if reconstruction proceeds without a decision about the intended result.

Provide any earlier casting, original artwork, dimensional record, photographs and carrier information that remain available. Mark uncertainty explicitly: for example, “logo edge is worn; restore to attached vector” or “tray border deformed; cavity-center layout must be re-established.”

Request a proposal for the reconstructed geometry and agree the sample approval route. Where critical dimensions cannot be recovered reliably, establish new requirements. Calling the order a repeat does not remove the engineering uncertainty.

Check the first delivery against the baseline

Before mixing replacement molds into existing stock, check the delivered identification and agreed acceptance evidence. For a changed design, keep old and new revisions distinguishable in storage and production.

• Match the shipment, PO and drawing revision.
• Compare the specified dimensions using the agreed support and measurement method.
• Review the appearance features against the identified reference, not memory.
• Confirm the carrier, support shell or mating half where those interfaces matter.
• Run the agreed functional casting trial and record results by mold or cavity ID where useful.
• For food-contact use, check that supplied documentation corresponds to the agreed material and scope; an old unrelated report is not a substitute.

A small development check is not a statistical batch acceptance plan. Agree sample size, limits and handling of nonconforming items for the order. If something fails, hold the affected stock and identify whether the cause is a reference conflict, a manufacturing deviation or a changed production process before approving a correction.

Repeat-order information to send with the PO

Copy these fields into the order brief:

• Project/SKU and previous PO:
• Exact repeat, controlled change or reconstruction:
• Released drawing/CAD revision and units:
• Accepted sample and master reference IDs:
• Agreed material and casting application:
• Carrier, shell or mating-interface reference:
• Requested changes and requirements that must remain unchanged:
• Acceptance checks and approver:
• Mold quantity, destination and requested delivery date:

For a replacement mold review, attach the released files and current condition photographs. RUUIPON reviews retained references, requested changes and production scope before confirming a repeat. Applicable custom RTV production starts at 20 mold pieces per design.

Reference and limits

ISO 10007:2017 provides general guidance on configuration management over a product's life. The checklist above is an original practical application for mold purchasing, not a claim of RUUIPON certification or a substitute for the standard. Project-specific ownership, storage and approval obligations remain those agreed by the parties.