Ensuring RoHS and REACH compliance in raw material procurement means verifying that all metals, plastics, and surface treatment chemicals are free of restricted hazardous substances through supplier declarations, CAS number checks, and third‑party test reports. You must track restricted substances in every homogeneous material, validate certificates, and keep a complete technical file for audits.
What Are RoHS and REACH Actually Requiring?
RoHS restricts 10 hazardous substances in electrical and electronic equipment to 0.1% (0.01% for cadmium) by weight in homogeneous materials, while REACH governs all chemicals used in the EU and requires tracking of Substances of Very High Concern (SVHC) above 0.1% and notification when thresholds are exceeded.
RoHS is the EU directive that limits lead, mercury, cadmium, hexavalent chromium, PBB, PBDE, and four phthalates in electronic products, and compliance is required for CE marking. REACH is a horizontal regulation covering all chemicals and articles, requiring registration, evaluation, authorization, and restriction for substances manufactured or imported at 1 tonne/year or more.
For global hardware brands, both rules apply at the same time. RoHS governs the restricted list for EEE, and REACH governs the broader chemical behavior and SVHC reporting across all product categories.
The restricted substances at a glance
How Do You Verify Material Certificates Correctly?
You verify material certificates by checking that they include the CAS number for each substance, clearly state compliance with RoHS and REACH, list the exact homogeneous materials, and are supported by accredited lab test reports when needed. A generic “RoHS compliant” claim without CAS numbers or test data is not enough.
From experience, the most common mistake is accepting a blanket supplier letter that does not tie compliance to a specific material lot or CAS number. When a supplier gives a Full Material Declaration (FMD), it should list every component and its composition, not just say “passes RoHS.”
At 6CProto, we treat certificates like traceable engineering data. We match the material grade, batch number, and test report to the actual part in production. That way, the audit file is complete and defensible.
What a strong compliance package looks like
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RoHS Declaration of Conformity signed by the manufacturer
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REACH SVHC screening data with CAS numbers
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IEC 62321 or IEC 63000 test reports from an accredited lab
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Batch/lot-level traceability linking test data to production lots
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Exemption documentation if RoHS exemptions are used
Which Materials Need the Closest Scrutiny?
The materials that need the closest scrutiny are those most likely to contain lead, cadmium, hexavalent chromium, or phthalates: metal alloys, electroplated coatings, wire insulation, PVC, stabilizers, pigments, and surface treatment chemicals. These are the high-risk areas where restricted substances hide.
Metal alloys can contain lead for machinability. Plated parts may carry hexavalent chromium unless trivalent chromium is specified. PVC and some rubber compounds often have phthalates or cadmium stabilizers. Even surface treatment baths and cleaning agents can introduce restricted chemicals if not controlled.
For hardware brands sourcing globally, the biggest risk is not the finished part but the upstream chemical system. Surface treatment suppliers, plating shops, and compound formulators are often several steps removed from the final assembly, making their declarations harder to trace.
High-risk materials and common hidden substances
Why Is CAS Number Tracking So Important?
CAS number tracking is important because it uniquely identifies each chemical substance, eliminating ambiguity in supplier declarations. Without CAS numbers, “lead-free” or “phthalate-free” claims are vague and can hide different chemical forms or impurities that still violate RoHS or REACH.
When we audit a supplier, we ask for the CAS number for every substance above a certain threshold, not just the generic name. This allows us to compare against the RoHS limited list and the REACH SVHC candidate list with precision.
For example, “phthalates” can be DEHP, BBP, DBP, or DIBP, all restricted under RoHS III. If a declaration only says “phthalates below limit,” it does not prove which ones are present. With CAS numbers, we can confirm each one individually.
How CAS numbers improve compliance
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Removes ambiguity in chemical names
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Enables precise matching against RoHS and REACH lists
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Supports SCIP database reporting for SVHCs
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Makes contract clauses and audit checks more reliable
When Should You Require Third-Party Test Reports?
You should require third-party test reports when the material is high-risk, the supplier is new, the declaration is vague, or the product is already on the market and under regulatory scrutiny. Third-party testing is also essential when RoHS exemptions are used or when previous audits have found issues.
Testing is not needed for every single part, but it is critical for risk control. For raw metals, plastics, and surface treatment chemicals that feed into multiple products, a single accredited test report can cover many downstream assemblies if the material formulation is stable.
At 6CProto, we recommend testing new raw material batches when there is a change in supplier, process, or formulation. For long-running suppliers, periodic re-testing every 12–24 months helps maintain confidence.
Triggers for third-party testing
Could a Single Declaration Cover All Your Materials?
A single blanket declaration cannot reliably cover all your materials if you want real compliance. It may work as a high-level statement, but it does not provide the traceability needed for audits, market surveillance, or SCIP reporting. Each homogeneous material needs its own documented compliance chain.
The EU expects manufacturers to maintain a technical file that demonstrates RoHS conformity, including material declarations, test reports, and risk analysis. If an authority asks for proof, a generic letter is not enough to show “reasonable steps” to comply.
For hardware brands, the practical approach is to use a standard declaration template for all suppliers, but require it to be filled out with specific material data, CAS numbers, and references to test reports. That way, the template is consistent, but the content is technically robust.
What a good declaration includes
A strong declaration of conformity should:
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Identify the product, material grade, and batch/lot number
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List all homogeneous materials and their composition
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State compliance with RoHS 2011/65/EU + 2015/863 and REACH Annex XVII
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Provide CAS numbers for key substances
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Reference supporting test reports (IEC 62321, IEC 63000)
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Include a signed statement of due diligence
How Do Surface Treatment Chemicals Fit In?
Surface treatment chemicals fit into compliance because they can introduce restricted substances into the final part, even when the base metal or plastic is clean. Plating, anodizing, coatings, and cleaning agents may contain hexavalent chromium, SVHCs, or restricted solvents that transfer to the part.
The key is to treat surface treatment as part of the material chain, not as a separate service. You need declarations from the plating shop or coating supplier for the chemicals they use, and you need to confirm that the finished part meets RoHS and REACH limits.
At 6CProto, we ask surface treatment partners for their chemical safety data sheets and compliance declarations, then verify that the final parts pass XRF screening or lab testing when necessary. That closes the compliance loop.
Surface treatment compliance checklist
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Get chemical safety data sheets for plating/coating baths
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Confirm no hexavalent chromium or restricted solvents
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Verify trivalent chromium if chromium plating is used
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Screen finished parts for Cr⁶⁺, Pb, and SVHCs when risk is high
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Keep batch-level traceability from bath to final part
6CProto Expert Views
“In real procurement, compliance is not a certificate on a shelf; it is a chain of decisions. The mistake many brands make is chasing a single ‘RoHS certificate’ for the finished product while ignoring the upstream chemicals. At 6CProto, we build compliance from the raw material inward: we lock CAS numbers into contracts, require Full Material Declarations for plastics and plating, and only accept suppliers who can tie test reports to specific batches. That is how you survive a market surveillance audit without paying for a recall.”
Conclusion
Ensuring RoHS and REACH compliance in raw material procurement requires a disciplined process: understand the restricted lists, demand CAS-numbered declarations, verify test reports, and keep a complete technical file. Focus extra scrutiny on high-risk materials like alloys, plating, PVC, and surface treatment chemicals, and require third-party testing when the risk is highest.
For global hardware brands, the most effective approach is to treat compliance as part of engineering, not just procurement. Use clear contract clauses, standardized declarations, and batch-level traceability so audits become routine instead of emergencies. With the right process, RoHS compliant manufacturing and green manufacturing hardware become a competitive advantage, not a cost burden.
FAQs
Do I need a RoHS certificate for every batch?No. You need a technical file that includes material declarations and test reports. Batch-level traceability is required, but you do not need a new certificate for every shipment if the material formulation is stable.
What if my supplier only provides a generic RoHS letter?That is not enough for audits. Ask for a detailed declaration with CAS numbers, homogeneous material breakdown, and supporting test reports from an accredited lab.
Are REACH and RoHS the same regulation?No. RoHS restricts 10 hazardous substances in electrical/electronic equipment, while REACH covers all chemicals and requires SVHC tracking and reporting across all product categories.
Can I use materials with RoHS exemptions?Yes, but you must document the exemption, ensure it is still valid, and keep records in your technical file. The exemption must match the product and application.
How does 6CProto support RoHS and REACH compliance?6CProto verifies raw metals, plastics, and surface treatment chemicals through supplier declarations, CAS number checks, and third-party test reports, then maintains traceable audit files for every batch shipped to global hardware brands.