Technical insight
High-Vacuum Components: How to Specify Cleaning and Packaging in an RFQ
When buying high-vacuum components, replace the vague instruction “supply clean” with a reviewable set of requirements. This guide helps purchasing and technical teams define the surfaces in scope, cleaning documentation, packaging boundaries and receiving decisions without inventing a universal cleaning recipe.
By Geetai Precision
- Published
- Updated
1. Define the requirement before choosing a process
Kurt J. Lesker identifies machining fluids, handling and storage as potential contamination sources and describes cleaning as a sequence rather than a single wipe. That supports asking about the complete path from manufacture to protected shipment, not just whether a cleaning operation appears on a quotation.
Start by identifying the vacuum-exposed surfaces and the customer-controlled document that defines their acceptance. Ask the responsible technical reviewer to specify any restricted substances, surface treatments, assembly interfaces and required evidence. Separate the delivered component condition from activities that the equipment integrator will perform later.
Use the checklist below as an original purchasing aid. It is not a process specification or a substitute for material-specific review. A supplier should respond to the customer's approved requirements; the purchasing team should not create a chemical or thermal treatment recipe from a general web article.
2. Attach a cleaning and packaging responsibility matrix
| Requirement area | Question to resolve in the RFQ |
|---|---|
| Surface boundary | Which surfaces contact the vacuum environment, and which external surfaces have separate handling requirements? Identify these on the controlled drawing or a referenced document. |
| Process approval | Who approves the proposed cleaning sequence and any proposed change? Request a referenced procedure and revision rather than an unspecified statement that the part will be cleaned. |
| Evidence | Which records demonstrate that the agreed procedure was followed, and which acceptance checks are required? Name the reviewer and the point at which approval is needed. |
| Direct-contact packaging | Which wrapping, closures and contact materials are permitted? Ask the supplier to identify them for approval and distinguish the inner protective layer from transport cushioning. |
| Receiving and storage | Who may open the package, where should it be opened, and what should happen if protection is damaged? Include the customer's storage and rework instructions where applicable. |
3. Distinguish a process record from an acceptance decision
Taborelli's CERN Accelerator School contribution discusses methods for evaluating surface cleanliness as well as the influence of packaging and storage on recontamination. The important procurement distinction is between documenting a cleaning activity and defining how the delivered condition will be judged.
Ask the technical owner to choose the required evidence for the actual application. If a requested check cannot be performed within the proposed supply scope, record it as an open item and assign responsibility. Do not silently replace it with a photograph, an undefined statement of cleanliness or a different check.
For a repeat order, compare the current procedure reference, material specification and packaging definition with the previously approved purchase package. Require a written deviation request for a proposed change. Treat the earlier order as a reference to review, not automatic approval for a different process or component.
4. Make the last handoff part of the purchase requirement
Define a packaging acceptance checkpoint before dispatch. Ask for the part identity, revision, agreed cleaning record reference and packaging identification to remain associated with the shipment. Specify how this information should be supplied without introducing unapproved marking or adhesive contact on controlled surfaces.
Consider a simple receiving scenario: the transport carton arrives intact, but the inner protective layer is torn. The buyer's instruction should say who isolates the item, who assesses the condition and who authorizes any further treatment. Do not leave the receiving team to assume that an undamaged carton resolves the inner-package issue.
Before order placement, close the responsibility matrix. Confirm the approved surface scope, procedure reference, evidence package, inner packaging materials and response to a damaged seal or wrapper. If any item remains unresolved, list it explicitly in the quotation clarification record.
5. Keep the supplier review specific to the project
Frequently asked questions
Does a visibly clean surface settle acceptance?
Use the agreed acceptance criteria, not appearance alone. Ask the technical owner to decide which observations, records or checks are needed for the application and define how a discrepancy is resolved before shipment.
Should the buyer specify a cleaning chemical in the inquiry?
Reference an existing approved customer procedure if one applies. Otherwise request a proposed procedure for technical review, including its compatibility with the specified component. Leave selection and approval to the responsible specialists rather than copying a general-purpose recipe.
Related review paths
References
- Kurt J. Lesker — Cleaning components for a high-vacuum system — Kurt J. Lesker Company. Accessed 2026-09-05T08:12:11.000Z.
- Mauro Taborelli — Cleaning and Surface Properties — arXiv / CERN Accelerator School contribution. Accessed 2026-09-05T08:12:11.000Z.