RoHS Testing for Cylinder Liner: Buyer Checklist
RoHS testing for cylinder liner is usually a documentation step, not a mechanical acceptance test. Buyers ask for it when the liner will be supplied into an electrical or electronic assembly, when the customer specification demands a restricted-substance declaration, or when the same part family is shared across export markets with different compliance files. The key point is scope. RoHS typically checks regulated substances in the finished part and in any relevant surface treatment, plating, coating, adhesive, ink, or preservative oil that remains on the delivered item. It does not confirm dimensional accuracy, hardness, or roundness. For procurement, the useful output is a traceable report tied to the part number, revision, lot code, and sampling date. The right file should sit alongside the supplier quality record, not replace it.
What RoHS actually checks
RoHS testing for cylinder liner is usually requested for the delivered condition of the part, not for every metallurgical property. In practice, buyers want evidence that restricted substances are below the applicable limits in the homogeneous material or surface layer that matters for the shipment.
Typical scope items include:
- Cadmium below 0.01% by weight in homogeneous material.
- Lead, mercury, and hexavalent chromium below 0.1% by weight in homogeneous material.
- PBB and PBDE below 0.1% by weight in homogeneous material.
- Surface treatments, phosphate layers, plating, ink, sealant, or preservative oil when they remain on the finished item.
For EU and UK supply chains, many buyers pair RoHS records with REACH (EC) No 1907/2006 declarations. That is separate from dimensional control, and it should be treated as a separate procurement check.
How to read the report
A useful lab report does more than show a pass result. It should identify the sample, the part number, the revision, the date, and the method used. If the report only says "complies" without traceability, it is weak evidence for a sourcing file.
What to verify
1. Sample identification matches the drawing and the shipment. 2. The report states whether the result covers the base metal, coating, or both. 3. The laboratory name and method are listed clearly. 4. The report gives numeric results, not only a pass/fail statement. 5. Any detection limit is below the relevant RoHS threshold.
A supplier working under IATF 16949:2016 and ISO 9001:2015 should have document control, revision control, and a defined re-test trigger after material or process changes.
Recommended test flow
For procurement, the most defensible flow is simple and repeatable.
1. Define the exact control item. State the drawing revision, alloy family, surface treatment, and whether the sample is from first article or serial production. 2. Sample by lot. One clean sample is not enough for process approval; request pieces from the same heat, coating batch, and finishing line. 3. Screen the part. Portable XRF is useful for quick checks on coatings and base metal, but it is a screening tool, not the final word on every analyte. 4. Confirm where needed. If a reading is close to the limit or the coating system is complex, send the sample to an accredited lab with ICP-OES, ICP-MS, or wet chemistry methods as applicable. 5. Freeze the evidence. Keep the lab report, certificate of conformity, and traceability record under the supplier's document control system. 6. Re-test after changes. New coating chemistry, furnace route, subcontractor, or preservative can change the result.
Screening vs confirmation
XRF is fast and non-destructive. It is useful for incoming control and supplier audits. Confirmatory testing is slower and costs more, but it is the defensible record when customers ask for a compliance file.
Procurement checklist before you place an order
For current part families, see our catalog, the related engine components, our quality system, and custom manufacturing for drawing-based supply.
| Item | What to ask | Why it matters |
|---|---|---|
| Test scope | Finished part, coating, oil, ink, and packaging? | Prevents a false pass from testing only the base metal. |
| Method | XRF screening, lab confirmation, or both? | Defines whether the report is fit for customer audit. |
| Sampling | Which lot, how many pieces, and when? | Links the result to serial production, not a one-off sample. |
| Traceability | Part number, revision, lot code, date code | Lets buyers tie the report to the shipped goods. |
| Accreditation | ISO/IEC 17025 lab or validated internal method | Improves defensibility in a procurement file. |
| Change control | Re-test triggers after chemistry or supplier changes | Keeps records current after process drift. |
