Electrical and electronic equipment placed on the European market must satisfy more than electrical safety, electromagnetic compatibility and functional performance requirements. Manufacturers must also control certain hazardous substances used in materials, components and assemblies.
Directive 2011/65/EU — commonly known as the Restriction of Hazardous Substances Directive or RoHS — establishes limits on the use of specified hazardous substances in electrical and electronic equipment.
RoHS compliance is therefore fundamentally a materials and supply-chain conformity process. Manufacturers need to understand product scope, restricted substances, homogeneous materials, exemptions, supplier declarations, material evidence, testing strategies and technical documentation before issuing the EU Declaration of Conformity.
This GAR Insight explains the RoHS framework and provides a practical route for manufacturers, importers and exporters preparing electrical and electronic equipment for the European market.
Navigate This Article
Explore RoHS scope, product categories, restricted substances, concentration limits, homogeneous materials, exemptions, supplier evidence, testing, technical documentation and CE marking.
Understanding the RoHS Directive
Directive 2011/65/EU establishes rules restricting the use of certain hazardous substances in electrical and electronic equipment.
The objective is to contribute to the protection of human health and the environment, including environmentally sound recovery and disposal of waste electrical and electronic equipment.
Which Products May Fall Within RoHS?
RoHS applies to electrical and electronic equipment falling within the categories established by the Directive, subject to its specific exclusions and transitional provisions.
Large Household Appliances
Electrical and electronic appliances used for major household functions.
Small Household Appliances
Smaller electrically powered domestic products and appliances.
IT & Telecommunications
Computers, networking equipment, communications devices and related electronics.
Consumer Equipment
Audio, video and other electrical or electronic consumer products.
Lighting Equipment
Relevant lamps, luminaires and other electrical lighting products.
Electrical & Electronic Tools
Electrical tools and equipment falling within the applicable scope.
Toys, Leisure & Sports Equipment
Electrical and electronic products within applicable leisure and toy categories.
Medical Devices
Relevant electrical and electronic medical devices subject to RoHS requirements.
Monitoring & Control Instruments
Measurement, monitoring and control equipment within the Directive’s scope.
Automatic Dispensers
Electrical and electronic dispensing equipment covered by the Directive.
Other EEE
Electrical and electronic equipment not otherwise covered by the preceding categories, where it falls within the Directive’s open-scope category.
Restricted Substances Under RoHS
RoHS currently restricts ten substances in electrical and electronic equipment, subject to applicable exemptions.
Lead — Pb
Historically used in solder, alloys, glass, ceramics and other electrical or electronic applications.
Mercury — Hg
Historically used in certain lamps, switches, sensors and specialised applications.
Cadmium — Cd
May occur in pigments, plating, electrical contacts, alloys and specialised components.
Hexavalent Chromium — Cr(VI)
Can be associated with certain coatings, corrosion-protection processes and surface treatments.
PBB
Polybrominated biphenyls are brominated flame-retardant substances restricted under RoHS.
PBDE
Polybrominated diphenyl ethers are restricted brominated flame retardants.
DEHP
Bis(2-ethylhexyl) phthalate, commonly associated with plasticised materials.
BBP
Benzyl butyl phthalate, a restricted plasticiser under RoHS.
DBP
Dibutyl phthalate, another restricted phthalate commonly associated with polymer applications.
DIBP
Diisobutyl phthalate, restricted under Annex II of the Directive.
Maximum Concentration Values
RoHS concentration limits are applied to homogeneous materials rather than calculated as an average across the complete finished product.
| Restricted Substance | Maximum Concentration Value by Weight in Homogeneous Material |
|---|---|
| Lead (Pb) | 0.1% |
| Mercury (Hg) | 0.1% |
| Cadmium (Cd) | 0.01% |
| Hexavalent Chromium [Cr(VI)] | 0.1% |
| Polybrominated Biphenyls (PBB) | 0.1% |
| Polybrominated Diphenyl Ethers (PBDE) | 0.1% |
| DEHP | 0.1% |
| BBP | 0.1% |
| DBP | 0.1% |
| DIBP | 0.1% |
Understanding Homogeneous Materials
One of the most important concepts in RoHS compliance is the homogeneous material. The concentration limits are not simply applied to the overall weight of the finished product.
Instead, manufacturers need to consider individual materials that cannot be mechanically disjointed into different materials.
Solder
A solder alloy may constitute a homogeneous material requiring its own restricted-substance assessment.
Metal Plating
Surface finishes and plating layers can require separate consideration.
Plastic Housing
A polymer material may need assessment for restricted substances, including relevant flame retardants and phthalates.
Cable Insulation
Insulation and jacket materials may require individual material-level evidence.
Connector Materials
Contacts, plating, plastics and other constituent materials can have different compliance risks.
Electronic Components
Components can contain several distinct homogeneous materials and should not automatically be treated as a single material.
RoHS Exemptions
RoHS includes exemptions allowing certain restricted substances to be used in defined applications where specified regulatory conditions are met.
Annex III contains exemptions relevant to a broad range of electrical and electronic equipment, while Annex IV contains exemptions specific to medical devices and monitoring and control instruments.
Application-Specific
An exemption normally applies to a defined use or technical application, not to unrestricted use of the substance.
Category-Specific
Some exemptions differ according to the applicable EEE category.
Time-Limited
Exemptions may have expiry dates and can be renewed, amended or allowed to lapse.
Evidence Required
Manufacturers should document precisely which exemption is relied upon and why it applies to the product.
Supplier & Material Compliance Evidence
For most manufacturers, RoHS conformity depends heavily on information obtained through the supply chain.
The challenge is not simply collecting declarations. The manufacturer should have sufficient confidence that the information accurately relates to the materials and components used in the marketed product.
Supplier Declarations
Declarations can provide useful conformity evidence where they clearly identify the component, material and applicable RoHS requirements.
Material Declarations
Detailed substance declarations can provide stronger evidence for higher-risk materials or complex assemblies.
Test Reports
Laboratory results can support conformity where supplier information is incomplete, uncertain or high risk.
Component Traceability
Part numbers, manufacturer identities and revision status should link supplier evidence to the actual production configuration.
RoHS Testing & Laboratory Analysis
RoHS conformity does not mean that every material in every product must automatically undergo full laboratory analysis. Testing is most effective when used as part of a risk-based evidence strategy.
XRF Screening
X-ray fluorescence can provide rapid screening for certain elemental restricted substances and help identify materials requiring further analysis.
Confirmatory Analysis
Laboratory methods may be required to confirm concentrations where screening results are uncertain or close to relevant thresholds.
Phthalate Analysis
Organic analytical techniques are generally required for restricted phthalates because elemental screening alone cannot identify them.
Chromium Speciation
Detecting chromium does not automatically determine whether restricted hexavalent chromium is present, so appropriate analytical methods may be needed.
A Risk-Based Approach to RoHS Compliance
An efficient RoHS programme does not treat every component as presenting the same level of risk.
Define Product
Confirm the production configuration and bill of materials.
Map Materials
Identify materials and components with potential substance risk.
Collect Evidence
Obtain supplier declarations, material data and reports.
Assess Reliability
Evaluate evidence quality, traceability and supplier confidence.
Identify Gaps
Find missing, inconsistent or high-risk material information.
Test Where Needed
Use screening or laboratory analysis to resolve uncertainty.
Document
Build traceable technical evidence supporting conformity.
Maintain
Control component changes, supplier changes and exemptions.
RoHS Technical Documentation
The manufacturer should maintain technical documentation capable of demonstrating conformity with the applicable RoHS substance restrictions.
EU Declaration of Conformity & CE Marking
RoHS forms part of the CE marking framework for applicable electrical and electronic equipment.
Once conformity has been established, the manufacturer prepares the EU Declaration of Conformity and includes Directive 2011/65/EU together with the other applicable Union harmonisation legislation.
RoHS Conformity
The manufacturer should establish that applicable restricted-substance limits are satisfied or that valid exemptions apply.
Technical Documentation
Supporting supplier evidence, material assessments and test data should be maintained as appropriate.
EU Declaration
RoHS should be identified on the EU Declaration of Conformity where applicable.
CE Marking
The CE mark represents conformity with all applicable EU legislation requiring CE marking, not RoHS alone.
Supplier Changes, Component Changes & Continued Compliance
RoHS compliance is not completed permanently when the initial technical file is created. Production changes can alter material composition and invalidate earlier evidence.
Supplier Change
A new supplier may use different materials, coatings, additives or manufacturing processes.
Component Revision
A revised component can have a different material composition even where fit, form and function remain similar.
Material Substitution
Changes to polymers, plating, solder, cable insulation or other materials should trigger appropriate RoHS review.
Exemption Change
Expiry or amendment of an exemption can affect products whose physical design has not changed at all.
Common RoHS Compliance Failures
| Common Issue | Why It Creates Risk |
|---|---|
| Using a generic supplier statement | The statement may not identify the actual component, material, substance limits or applicable RoHS version. |
| Testing only the complete assembled product | A non-compliant homogeneous material may be diluted within the overall product result. |
| Ignoring phthalates | Older compliance systems may still focus only on the original six restricted substances. |
| Assuming XRF detects everything | XRF cannot by itself establish conformity for all restricted substances, particularly organic phthalates. |
| Using expired supplier evidence | Materials, components and manufacturing processes may have changed. |
| Relying on an exemption without tracking it | Exemptions can expire, change scope or differ according to EEE category. |
| No component traceability | Compliance evidence may not correspond to the components actually used in production. |
| RoHS omitted from the EU Declaration | The declaration may fail to reflect all applicable Union harmonisation legislation. |
From Material Selection to Demonstrable RoHS Conformity
RoHS compliance is most effective when it is integrated into product development and purchasing rather than treated as a document requested from suppliers shortly before shipment.
Product designers influence material selection. Purchasing teams influence supplier and component consistency. Compliance personnel establish evidence requirements. Laboratories resolve uncertainty. Change-control systems help ensure that the product manufactured six months later remains consistent with the product originally assessed.
The Material Question
Do the homogeneous materials used in the product satisfy the applicable restricted-substance limits or valid exemptions?
The Evidence Question
Can the manufacturer trace the conformity claim back to reliable, current and product-specific material evidence?