Environmental regulations shape every aspect of modern electronics manufacturing, and wire harness production is no exception. Two European Union regulations—RoHS and REACH—have become de facto global standards that manufacturers must comply with regardless of where their products are sold. Understanding what these regulations require, how they affect material selection, and what documentation obligations they create is essential for any company sourcing or producing wire harnesses.
What Is RoHS?
The Restriction of Hazardous Substances Directive (RoHS), originally enacted as Directive 2002/95/EC and updated by Directive 2011/65/EU (RoHS 2) and its amendment 2015/863 (RoHS 3), restricts the use of specific hazardous materials in electrical and electronic equipment (EEE). The directive applies to products sold in the EU market but has been adopted or mirrored by regulations in China, South Korea, Turkey, the UAE, India, and many other countries.
RoHS restricts ten substances to maximum concentration values measured in homogeneous materials:
- Lead (Pb): 0.1% (1,000 ppm)
- Mercury (Hg): 0.1%
- Cadmium (Cd): 0.01% (100 ppm)
- Hexavalent chromium (Cr6+): 0.1%
- Polybrominated biphenyls (PBB): 0.1%
- Polybrominated diphenyl ethers (PBDE): 0.1%
- Bis(2-ethylhexyl) phthalate (DEHP): 0.1%
- Butyl benzyl phthalate (BBP): 0.1%
- Dibutyl phthalate (DBP): 0.1%
- Diisobutyl phthalate (DIBP): 0.1%
The last four phthalates were added by RoHS 3 and apply to all products from July 22, 2019. For wire harness manufacturers, the most relevant restricted substances are lead in solder and terminal plating, cadmium in contact plating, hexavalent chromium in metal treatments, and phthalates in flexible PVC insulation and jacketing. Our wire harness glossary covers the technical terms used in material compliance.
RoHS Exemptions Relevant to Wire Harnesses
The RoHS directive includes specific exemptions where technically viable alternatives do not yet exist. Several are directly relevant to wire harness manufacturing:
- Lead in high-temperature solders (containing more than 85% lead by weight) used in specific applications
- Lead in copper alloys containing up to 4% lead by weight (relevant to some connector contacts)
- Lead in compliant pin connector systems for specific applications
- Cadmium and cadmium compounds in electrical contacts for certain safety-critical switching devices
Exemptions have defined expiration dates and are periodically reviewed. Manufacturers must track exemption renewals and plan material transitions accordingly.
What Is REACH?
REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) is a broader EU regulation (EC 1907/2006) that addresses the production and use of chemical substances across all industries—not just electronics. While RoHS targets specific substances with hard limits, REACH creates a framework for identifying, evaluating, and controlling chemicals of concern through a continuously expanding Candidate List of Substances of Very High Concern (SVHCs).
As of early 2026, the SVHC Candidate List contains over 240 substances. For wire harness manufacturers, the most relevant entries include certain flame retardants, plasticizers in PVC compounds, specific pigments, and surface treatment chemicals. Any article containing an SVHC above 0.1% by weight triggers a duty to communicate safety information down the supply chain and, upon request, to consumers.
How Wire Harness Manufacturers Ensure Compliance
Material qualification begins with sourcing. Compliant manufacturers maintain an approved materials list where every wire, insulation compound, connector, terminal, sleeve, tape, and label has been verified for RoHS and REACH compliance. Suppliers must provide material declarations—typically using the IPC-1752A format or full material declarations (FMDs)—confirming substance content.
Incoming inspection may include XRF (X-ray fluorescence) screening to verify that incoming materials match their declared composition. XRF can rapidly detect restricted heavy metals like lead, cadmium, mercury, and chromium in metals, plastics, and coatings.
Process control ensures that compliant and non-compliant materials (for exempt or non-regulated applications) are never mixed in production. Segregated storage areas, clearly labeled material bins, and production traveler documentation prevent cross-contamination. Learn more about how SIMKAB manages quality and compliance on our about page.
Documentation and Traceability
Compliance is only meaningful if it can be demonstrated. A robust traceability system links every finished harness back to its component materials through lot numbers, purchase orders, and supplier certificates. This traceability chain must be maintained for the product’s lifetime plus any regulatory retention period.
Key documentation includes:
- Supplier material declarations (per IPC-1752A or equivalent)
- Certificates of Compliance (CoC) for each material lot
- XRF or third-party analytical test reports where required
- Internal audit records demonstrating process controls
- SCIP database notifications for articles containing SVHCs above 0.1% (required under the EU Waste Framework Directive)
Maintaining this documentation is not optional—it is a legal requirement for placing products on the EU market and is increasingly expected by customers worldwide. Our quality certifications page details the standards and systems we have in place to guarantee full traceability.
Staying Ahead of Regulatory Changes
Both RoHS exemptions and the REACH SVHC Candidate List are updated regularly. Manufacturers must actively monitor regulatory developments, participate in industry working groups, and plan material transitions well ahead of enforcement dates. Reactive compliance—scrambling to replace a banned substance after a deadline—causes production disruptions, supply shortages, and potential market access issues.
At SIMKAB, environmental compliance is embedded in our material selection, supplier qualification, and production processes. We proactively track RoHS and REACH developments to ensure our customers’ harnesses remain fully compliant—today and into the future. Get a quote to work with a manufacturer that takes compliance as seriously as you do.
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