What does a buyer check before sending a part drawing to a moulder?
Answer
They check the machine range against their part size, the materials you already run, and who will own the tool. A machine list with tonnages and a plain statement on tooling ownership answers more of the first conversation than any capability page.
A sourcing engineer has a component to move to a new supplier and is trying to work out, without calling, whether your shop can run it.
Information to make clear
Use the fields that affect this buying decision. Leave unsupported claims out.
- Process
- Injection, blow, extrusion, compression and rotational moulding are different businesses.
- Machine range in tonnage
- The clearest single indicator of the part sizes you can run.
- Materials and grades already processed
- Experience with the specific polymer reduces the buyer's risk.
- Part size and weight range
- A direct filter for the buyer's drawing.
- Tolerance capability
- Determines whether the drawing is achievable in your process.
- Tooling: in-house, partnered or customer-supplied
- Changes the project timeline entirely.
- Annual volume band
- Prototype, low volume and mass production suit different shops.
Documents to prepare
State what can be published, shared on request or issued with an order.
| Document | What it supports | Suggested handling |
|---|---|---|
| Material datasheet with resin sourceMay be requested at: technical evaluation | Which polymer and grade the part will actually be made from | Share on request |
| Food contact compliance declarationMay be requested at: food, beverage and packaging applications | Conformity for food-contact applications under the destination market's framework | Share on request |
| RoHS and REACH declarationMay be requested at: by eu and electronics buyers | Substance compliance for electronics and EU-bound goods | Publish |
| Dimensional report or First Article InspectionMay be requested at: first production run | That the moulded part matches the drawing | Issue per shipment |
| ISO 9001 or IATF 16949 certificateMay be requested at: vendor approval | Quality system, with number and certification body | Publish |
| Machine listMay be requested at: shortlisting | Tonnage, make and count: the real capability statement | Publish |
| Tooling ownership termsMay be requested at: before the tooling order | Who owns the mould, and what happens if the relationship ends | Publish |
Details to ask in an enquiry
Collect only the information needed to assess the request and respond.
- Drawing or 3D file
- Nothing meaningful can be quoted without it.
- Material and grade
- Or a statement that you should recommend one.
- Annual volume and batch size
- Determines tooling strategy and price.
- Tooling status
- New tool, transfer tool or existing tool are three different projects.
- Tolerance and critical dimensions
- Decides process feasibility.
- Destination and required date
- Freight and capacity.
Related questions
Should we publish our full machine list?
Yes. Tonnage range, machine count and platen size are the fields a sourcing engineer uses to filter suppliers, and there is nothing commercially sensitive in them. Shops that publish them get drawings that fit; shops that do not get enquiries they have to decline.
How do we talk about tooling without scaring buyers?
State the ownership model plainly and say what happens at end of life: whether the tool can be released, and on what terms. Buyers are not scared by tooling cost, they are scared by ambiguity about who controls the tool once it exists.
Is a photo gallery of parts useful?
Only with the material, process and approximate size beside each part. A gallery of unlabelled parts is decoration; the same gallery with three data points per part becomes a capability argument the buyer can check against their own drawing.
This is an editorial checklist, not a compliance standard. Requirements vary by market, customer and contract. Confirm current requirements with the responsible technical and commercial teams.
Plact Research. Plact's editorial desk for buyer-evidence guides. The guides organize common buyer questions, documents and enquiry fields. Requirements should be checked against current standards, regulations and contracts.