What does a buyer check before sending a part drawing to a moulder?
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.
Reviewed 4 August 2026
Scope and specifications
- 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 buyers may need
| Document | What it proves | Where it belongs |
|---|---|---|
| Material datasheet with resin sourceAsked at: technical evaluation | Which polymer and grade the part will actually be made from | Name it, share on request |
| Food contact compliance declarationAsked at: food, beverage and packaging applications | Conformity for food-contact applications under the destination market's framework | Name it, share on request |
| RoHS and REACH declarationAsked at: by eu and electronics buyers | Substance compliance for electronics and EU-bound goods | Publish it |
| Dimensional report or First Article InspectionAsked at: first production run | That the moulded part matches the drawing | Per shipment |
| ISO 9001 or IATF 16949 certificateAsked at: vendor approval | Quality system, with number and certification body | Publish it |
| Machine listAsked at: shortlisting | Tonnage, make and count — the real capability statement | Publish it |
| Tooling ownership termsAsked at: before the tooling order | Who owns the mould, and what happens if the relationship ends | Publish it |
Details for a useful enquiry
- 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.
Questions suppliers ask
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.
Check which documents and standards your buyer needs; requirements vary by market, customer and contract.
Plact Research. Plact's editorial desk for buyer-evidence research. Industry standards, documents and buyer questions are researched and drafted with Plact's AI tools, then reviewed by Praveen Kavuri before publication. Every claim cites the standard, regulation or public source it rests on.
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