Suppose you receive a sample industrial component, check its dimensions and appearance, and try it in the intended mounting position. It meets the requirements you checked, so you reply: “Sample approved.”
That is useful feedback. But does the supplier know which sample you approved, what you checked, and whether anything remains unresolved? Does the reply also authorize production, or only confirm the features you reviewed?
At ESG, we recommend making those decisions explicit. Sample approval gives the order a useful reference when the buyer and supplier understand what it covers and how it connects to the production requirements.
Establish what the sample represents
Before using a sample as the reference for an order, confirm how it relates to the goods you intend to buy.
It might be a stock item from an existing range, a custom prototype, or a sample made to demonstrate one feature. Ask which aspects will remain the same in production and which will differ. A sample supplied for checking dimensions may not contain the material, finish or components specified for the final order.
For example, in a hypothetical purchase, a buyer approves a bracket’s dimensions and mounting-hole positions. That review does not also confirm its material grade, load capability or surface treatment unless those requirements were assessed. The approval should describe its actual scope.
Use a sample number, revision, dated photograph or another clear identifier. “The sample you sent” becomes difficult to follow when several versions have been exchanged. Where practical, retain an identified reference sample and make sure the supplier can identify the same version.
Turn the approval into clear order requirements
“Produce according to the approved sample” leaves room for questions if the sample does not explain every requirement. Connect it to the purchase order, applicable drawings, specifications and any differences already accepted.
Start with the features that mattered in the review. If a dimension was measured, record the result against its requirement. If an appearance or finish was accepted, identify the reference used. If a function was demonstrated, record the conditions and limits of that check. This helps the production and inspection teams understand what was accepted without guessing from a general approval message.
The record can be brief. It needs to identify the sample, the features approved, the relevant order requirements and the issues still open.
An unresolved issue needs a next step. Perhaps a material record is missing, an interface needs engineering review, or the sample includes a temporary component. Identify who will confirm it and whether it prevents the affected work from starting. Some preparation may be able to continue; other work may need to wait. The authorized reviewer should make that distinction clear.
If the sample and drawing disagree, resolve the conflict before relying on either one for the affected work. Do not assume the physical sample, latest email or newest drawing automatically takes priority. Check the order’s agreed arrangements, explain the difference and obtain a decision from the appropriate person. Then update the relevant records so the supplier does not have to choose between conflicting instructions.
Procurement can organize the information and communicate the decision. Important technical requirements need review by people qualified to assess them. The buyer handling the order does not need to measure every parameter personally, but should know which requirements have been confirmed and which still need review.
Finally, ask the supplier to confirm the production basis it will use. The workshop should receive the agreed references and approval limits, rather than only a forwarded message saying “Sample approved.”
Keep changes visible during production
Once production begins, pay attention to changes that could affect the approved requirements. These might involve a material, purchased component, dimension or manufacturing process.
Ask the supplier to explain the proposed change, the affected items and quantities, and the basis for accepting it. Follow the approval arrangements for the order. A replacement already purchased or fitted still needs the relevant review; completed work does not establish approval.
Our guide to reviewing a supplier’s material or component change request covers that decision in more detail.
If a change is accepted, check whether the sample reference or supporting documents need updating. Keep any differences between the retained sample and the accepted production configuration clear, so an inspector does not reject an approved change—or overlook an unapproved one.
Check the production goods against the agreed basis
When the goods are ready, use the sample alongside the order, drawings, specifications and agreed acceptance criteria.
Visual similarity supports only the features that can be compared visually. It does not establish material composition, hidden construction or performance. Likewise, a satisfactory result for one unit applies to that unit and the checks performed; it does not establish that every unit in the batch meets every requirement.
Agree on an inspection scope suited to the product, quantity and risk. Identify which units or features will be checked, how the checks will be performed and what records are needed. There is no single sample quantity that fits every industrial order.
The industrial equipment pre-shipment inspection checklist explains how to connect equipment identification, configuration, test records and shipment completeness.
If a difference appears, compare it with the current approval record. Establish whether it is an accepted variation, a reference error or a departure that still needs a decision.
Write an approval the supplier can act on
A useful approval reply names the sample and states the features accepted. It also identifies outstanding issues, the production documents and the work authorized to proceed.
Adapt the template below to the actual decision. If no production work has been authorized, say so. If only certain work may proceed, name it precisely. Avoid letting a limited sample approval read as permission to manufacture the entire order.
Sample approval reply template
Subject: Sample review and production status — [PO / item reference]
Hi [Name],
We have reviewed sample [sample ID / revision / date] and approve [specific features checked], as recorded in [review record / reference].
[Outstanding issue] remains open. Please provide [information or correction needed] by [date] for review by [responsible person / team].
For production, please use [PO / item reference], [drawing and revision] and [specification and revision], together with [identified sample and any approved differences]. Please flag any conflict between these references before proceeding with the affected work.
This approval covers only the features stated above. Production status: [no production work is authorized yet / only the following work may proceed: ___]. [Work or items on hold] must wait for written release from [authorized person / team].
Please submit any further change affecting these requirements for review before applying it, and confirm your understanding of the references and work status.
Thanks,
[Your name]
Discuss an unclear sample approval with ESG
If the sample, specification and supplier’s understanding do not align, share the sample record, order requirements and unresolved differences. Contact ESG to discuss what needs clarification with the supplier.
These records provide a starting point for the supplier communication. Technical suitability, acceptance and any production release should be confirmed by the appropriate personnel under the arrangements for your order.
