| What the evidence covers | Declarations cover what the supplier or material-declaration data says for identified parts, materials, revisions, and substances. They can give broad BOM coverage when supplier data is complete and traceable. | Lab tests cover the sampled material or uniform material tested under a stated method. They give stronger analytical evidence for that sample but do not automatically cover every supplier, lot, color, coating, or future revision. | Use declarations to build coverage across the BOM, then use testing to close specific uncertainty. Do not let either evidence type imply broader coverage than its scope supports. |
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| Who remains responsible | A supplier can provide declarations, but RoHS Article 7 keeps the manufacturer responsible for technical documentation, internal production control, the EU declaration of conformity, CE marking, and 10-year recordkeeping. | A lab can provide test results, but the manufacturer still decides whether the selected sample, method, and result are enough for the RoHS conformity file. | Treat suppliers and labs as evidence providers. Keep the manufacturer or product compliance owner named as the decision owner for the final RoHS conclusion. |
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| When to use it | Use declarations for stable, lower-risk materials where supplier identity, part revision, restricted-substance coverage, and date are clear enough to support the technical documentation. | Use tests when supplier evidence is missing, generic, stale, contradictory, or too narrow; when materials have higher substance risk; when exemptions are uncertain; or when a customer, importer, or market-surveillance needs stronger evidence. | Make testing risk-based and documented. The trigger should explain why supplier evidence was enough, or why analytical evidence was needed for a particular material or substance. |
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| How it supports RoHS duties | Declarations help the manufacturer show how materials, components, or EEE were assessed against RoHS substance restrictions and any exemption assumptions. | Tests and measurements can demonstrate compliance with Article 4 requirements and, when performed or assessed under harmonised standards published in the Official Journal, support the RoHS presumption of conformity. | The duty is not to collect certificates for their own sake. The duty is to keep technical documentation that supports the EU declaration of conformity and remains available after market placement. |
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| Evidence quality checks | Check whether the declaration names the supplier, part or material, revision, covered substances, concentration basis if stated, date, signatory or system source, and any exclusions or exemptions. | Check whether the lab report identifies the sample, preparation, method, measured substances, units, result, detection or reporting limits where provided, lab identity, and whether the tested material matches the product risk. | Reject generic evidence. A useful RoHS record ties each declaration or test to a BOM item, homogeneous-material question, restricted substance, and decision owner. |
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| Review timing | Declarations should be reviewed when product design, materials, supplier identity, manufacturing process, exemption status, or harmonised standards change. | Tests should be repeated or supplemented when the tested sample no longer represents the marketed product, a new material or supplier is introduced, or a prior screening result leaves an unresolved substance question. | RoHS Article 7 requires series production to remain in conformity and requires changes in product design, characteristics, harmonised standards, or technical specifications to be taken into account. |
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| Authority and customer scrutiny | A clear declaration pack can answer many customer and importer evidence requests, but it must be specific enough to show what was assessed and who stands behind it. | Testing can be important when market-surveillance or customer scrutiny focuses on a material, coating, plastic, cable, spare part, or other area where supplier documents are not persuasive. | Keep both evidence types ready for review. Importers need access to the EU declaration of conformity and technical documentation, and market-surveillance authorities may request documentation or corrective action under the EU product-compliance framework. |
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| How declarations and tests work together | Declarations can narrow the testing plan by identifying materials, substances, exemptions, and supplier claims that need confirmation or can be accepted with low residual risk. | Tests can validate or challenge supplier evidence for selected materials, especially where XRF screening or targeted IEC 62321 methods are appropriate for the substance question. | The strongest RoHS file usually combines supply-chain declarations with targeted testing. The record should explain why the mix is proportionate to the product and material risk. |
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| Practical decision rule | Accept declarations when they are traceable, current, substance-specific enough for the product risk, and consistent with the BOM and exemption assumptions. | Add tests when the declaration trail is missing or weak, the material or supplier risk is high, a restricted substance question remains open, or the decision needs independent analytical evidence. | Write a short rationale for each keep-as-declaration or test-needed decision, then store the rationale with the RoHS technical documentation and EU declaration of conformity. |
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