RoHS material conformity review links the materials actually used in a product to corresponding evidence of substance restrictions. After changing a connector, solder, or bare-board material, first confirm whether existing documentation covers the new manufacturer part number, composition, and applicable market. A recent document date does not resolve a changed coverage object. The European Commission's overview lists ten restricted substances and treats product scope, restriction lists, and exemptions separately. Purchasing and engineering should maintain these separately.
First determine exactly what the declaration covers
An internal code in a controlled BOM is only an entry point. One code may map to multiple manufacturer part numbers or permit different plastics, platings, or solder-terminal structures. Documentation should trace to the actual manufacturer and full model; a series declaration must explain coverage of the selected model. A statement that “our products comply with RoHS” without a product list, responsible entity, or applicable restriction list cannot approve an entire substitute-material set.
Review materials and component composition rather than only total board weight. The product-responsible party should define homogeneous materials according to applicable regulations and test objects. Whole-board averages cannot cover gaps in local materials. Consult the applicable current legal text for specific limits, exemption numbers, and effective conditions; this page does not treat a general engineering screening table as a product conformity determination.
What declarations, screening, and confirmatory testing each establish
| Document Type | Questions to Answer | Content Still Requiring Verification |
|---|---|---|
| Supplier Material Declaration | Which part numbers and substance lists the declaring entity commits to | Issuer, model coverage, revision, exemptions, and traceability |
| Screening Record | Whether specified samples and locations show signals requiring further investigation | Method suitability, detection capability, sample preparation, and substance forms that cannot be directly distinguished |
| Specialized Test Report | Results obtained from submitted samples using specified methods | Whether the report covers current materials, all test items, and applicable conclusion criteria |
| Complete System Technical Documentation | Whether the evidence chain covers the actual configuration placed on the market | Whether material changes, product classifications, exemption conditions, and responsibility documents are updated together |
For example, elemental screening does not automatically establish a compound concentration. If a report's sample name resembles the ordered model, check photos, structural descriptions, and submission details. “Same series” matters only when coverage logic is clear. Confirm test items and methods with the laboratory before commissioning tests to avoid a report that cannot address the current issue.
five-step handling for substitute material changes
- Use the change notice to identify new and replaced part numbers, reference designators, and affected product revisions; do not record only a supplier-name change.
- Obtain declarations and linked documentation for the new part number; confirm the restricted-substance list, issuer, and document date. List exemption numbers, uses, and conditions separately when applicable.
- Compare old documentation to identify evidence gaps, such as uncovered new plating, a plastic color outside the series declaration, or a tested sample that differs from the purchased model.
- Select supplemental declarations, screening, or targeted testing according to customer material-management requirements and evidence risk; do not mechanically retest the entire product after every material change.
- After approval, update the BOM, substitute-material list, and evidence index, identifying the changeover between old and new lots. Keep part numbers unapproved until evidence gaps are closed.
These steps produce a reviewable chain: product revision—internal material number—manufacturer part number—supply lot—evidence document—applicable conditions. Purchasing obtains documents, engineering confirms actual structure, and quality checks documentation against physical items, preventing attachments from being lost after repeated forwarding.
Documentation coverage example for a connector replacement
Suppose a board has 40 manufacturer part numbers under management, with documentation clearly covering 38. Connector J1 changes to a new model, and a declaration for another solder lot has not arrived. Documentation coverage is 38÷40＝95%. This tracks documentation completeness only, not 95% legal conformity, and does not automatically release the remaining two items.
| project | Legacy status | Post-Change Handling |
|---|---|---|
| J1 Internal Material Number | CON-01, corresponding to manufacturer A's model A1 | Create an independent mapping to manufacturer B's model B2; record plastic and terminal options |
| Declare D-07 | Appendix Lists Only A1 | Do not extend existing attachment coverage; obtain B2 documentation from manufacturer B |
| Old Test Reports | Sample is A1 | Historical evidence only; new documentation gaps determine whether supplemental testing is needed |
| Approval Output | Product Version R1 | Map R2 to B2; record the changeover lot and approver |
If B2 still offers multiple platings, lock the purchased option. Then check packaging labels, incoming inspection records, and actual assembly lots so the documented model matches the finished configuration. This identifies exactly which document is missing instead of recollecting all documentation unrelated to the change.
Most common failure points in data review
Expired declarations and declarations lacking coverage are different issues. The former concerns current requirements and document maintenance; the latter cannot establish the actual material even with a recent date. If supplier names differ, first confirm trader/manufacturer relationships. If report pages are missing, restore sample descriptions, result pages, and decision criteria. If a result says only “not detected,” retain the method and detection limit rather than rewriting it as absolute absence.
If physical items conflict with documents, retain the lot and investigate its source; do not overwrite it with good results from another lot. If one part number is made at several factories, check declaration coverage of those sites and material structures; retain written explanations for added coverage. If customers add restrictions, distinguish their lists from the statutory RoHS list so contractual requirements are not misrepresented as the complete legal requirements.
How to avoid misalignment of test objects before sampling?
A test request should first identify the gap: a new plastic color, terminal plating, solder, or complete component. Confirm with the laboratory whether the target material can be separated, required sample quantity, and report naming. The sample description should trace to the purchased model and lot, with disassembly photos where needed. Even tested loose parts without model identification are difficult to link to assembled materials.
After receiving results, check sample identity, test items, methods, result units, and decision criteria for completeness. If a report covers only one separated material, do not extend its conclusion to every component constituent. Retain the representativeness basis when testing another lot. Identify missing test items as pending rather than hiding them under an overall “pass.”
A document administrator can assign each file a unique identifier and list supported part numbers and product revisions. When replacing files, retain historical attachments and replacement links so a new declaration removing an old model does not erase historical-lot evidence. Later investigations can then trace from board identification to materials and files rather than only finding a similarly titled PDF.
Frequently Asked Questions
Validity Period of a Single Declaration
No universal interval applies independently of the product, regulatory changes, and customer requirements. Define review triggers such as changes to composition, manufacturing site, model, restriction list, or exemptions, and check the declaration's own scope conditions. Periodically collecting new documents does not replace change-triggered review.
Must all components be re-inspected?
Testing is not the only form of evidence and cannot replace model coverage and document traceability. Select supplemental methods for unproven materials and items, recording the rationale and uncovered scope. The party responsible for the final product reaches its conclusion against applicable requirements.
Can a bare board declaration prove the assembled board?
It supports only the bare-board materials and processes explicitly covered. Solder, components, harnesses, connectors, and materials introduced during assembly still need evidence for the actual configuration. Continue to Complete Manufacturing Combination and Manufacturing data delivery checklist and link material identity to the order revision.
Source material and applicable scope
- European Commission, “Restriction of Hazardous Substances in Electrical and Electronic Equipment (RoHS)”; version: official overview webpage with no document revision stated; legal entry links to 2011/65/EU and related amendments; checked on 2026-10-17; relevant sections: Objectives, Law, Restricted substances, Exemptions, Implementation. Supports reviewing RoHS scope, ten restricted substances, and exemptions separately. This page's document-control method is engineering organization guidance, not a legal conclusion for a specific product.
