RoHS test | Beijing ZKGX Research Institute

RoHS (Restriction of Hazardous Substances) testing is a critical compliance process that verifies electrical and electronic equipment (EEE) does not contain restricted hazardous materials above specified concentration limits. The RoHS Directive, originated by the European Union, restricts the use of specific dangerous substances in electrical and electronic products to protect human health and the environment.

RoHS compliance testing has become one of the most important standard procedures for manufacturers, sellers, distributors, and recyclers of electrical and electronic components. Products sold or used within the European Union must meet RoHS requirements, making testing essential for market access.

Why RoHS Testing Matters

The restriction of hazardous substances addresses critical environmental and health concerns:

Environmental Protection:

Prevents pollution of landfills from toxic electronic waste
Reduces contamination of soil and groundwater
Supports sustainable waste management practices

Human Health:

Protects workers from occupational exposure during manufacturing
Reduces health risks during product disposal and recycling
Prevents long-term exposure to toxic materials

Market Access:

Required for selling products in the EU market
Increasingly adopted by other regions globally
Demonstrates corporate responsibility and environmental commitment

Ten Restricted Substances Under RoHS

The RoHS directive currently restricts ten hazardous substances, with specific maximum concentration values (MCVs) for each:

Original Six Substances (RoHS 1)

Substance	Symbol	Maximum Limit	Common Applications
Lead	Pb	0.1% (1000 ppm)	Solder, PVC stabilizers, pigments, glass, batteries
Mercury	Hg	0.1% (1000 ppm)	Fluorescent lamps, switches, batteries
Cadmium	Cd	0.01% (100 ppm)	Pigments, batteries, plating, stabilizers
Hexavalent Chromium	Cr(VI)	0.1% (1000 ppm)	Chrome plating, chromate coatings, primers
Polybrominated Biphenyls	PBB	0.1% (1000 ppm)	flame retardants in plastics
Polybrominated Diphenyl Ether	PBDE	0.1% (1000 ppm)	flame retardants in plastics

Four Additional Substances (RoHS 3 - 2015/863)

Added effective July 22, 2019:

Substance	Acronym	Maximum Limit	Common Applications
Bis(2-ethylhexyl) phthalate	DEHP	0.1% (1000 ppm)	Plasticizers in PVC, cables
Benzyl butyl phthalate	BBP	0.1% (1000 ppm)	Plasticizers in adhesives, sealants
Dibutyl phthalate	DBP	0.1% (1000 ppm)	Plasticizers in paints, adhesives
Diisobutyl phthalate	DIBP	0.1% (1000 ppm)	Plasticizer alternative to DBP

Understanding Concentration Limits

The maximum permitted concentrations apply to homogeneous materials, not the finished product or component. A homogeneous material is defined as:

A material that cannot be mechanically disjointed into different materials
Examples include plastic casing, metal screws, wire insulation, solder on a circuit board

Example: If a radio's plastic case contains 2,300 ppm (0.23%) PBB as a flame retardant, the entire radio fails RoHS compliance, even if all other components are compliant.

RoHS Directive Evolution

RoHS 1 (Directive 2002/95/EC)

Effective Date: July 1, 2006

Key Features:

Restricted six hazardous substances
Applied to eight categories of electrical and electronic equipment
Focused on reducing hazardous materials in consumer electronics
Closely linked with WEEE Directive 2002/96/EC

RoHS 2 (Directive 2011/65/EU)

Effective Date: January 2, 2013

Major Changes:

Expanded scope to include all electrical and electronic equipment (open scope)
Added medical devices and monitoring/control instruments
Required CE marking for compliance indication
Mandated Declaration of Conformity (DoC) documentation
Introduced importer and distributor responsibilities
Established exemption expiration system (5-7 years automatic expiry)
Required technical files demonstrating conformity

CE Marking Requirements: Products must display:

CE mark
Manufacturer's name and address
Serial or batch number
EU Declaration of Conformity

RoHS 3 (Directive 2015/863)

Effective Date: July 22, 2019

Key Additions:

Added four phthalates to restricted substance list
Applied to all electrical and electronic equipment
Medical devices and monitoring instruments included from July 22, 2021

Products Within RoHS Scope

Covered Categories (11 Categories)

Large household appliances - Refrigerators, washing machines, microwaves
Small household appliances - Vacuum cleaners, toasters, irons
IT and telecommunications equipment - Computers, phones, routers
Consumer equipment - Televisions, audio equipment, cameras
Lighting equipment - Lamps, light bulbs, luminaires
Electrical and electronic tools - Drills, saws, sewing machines
Toys, leisure, and sports equipment - Electronic toys, video games
Medical devices - Diagnostic equipment, therapeutic devices
Monitoring and control instruments - Industrial measurement devices
Automatic dispensers - Vending machines, ATMs
Other EEE - Any equipment not covered by categories 1-10

Equipment Operating Voltage

RoHS applies to equipment operating at:

Up to 1000 V AC
Up to 1500 V DC

Scope Exclusions

The following equipment is excluded from RoHS requirements:

Equipment necessary for protection of essential security interests (military equipment, arms, munitions)
Equipment designed for space applications
Equipment specifically designed as part of another excluded equipment type
Large-scale stationary industrial tools
Large-scale fixed installations
Means of transport for persons or goods (except electric two-wheel vehicles not type-approved)
Non-road mobile machinery for professional use only
Active implantable medical devices
Photovoltaic panels for professional solar installations
Equipment designed solely for research and development (B2B only)

Specific Exemptions

Over 80 exemptions exist, including:

Lead exemptions:

Lead as alloying element in steel (up to 0.35%)
Lead in aluminum (up to 0.4%)
Lead in copper alloys (up to 4%)
Lead in high-melting-temperature solders (≥85% lead)
Lead in solders for servers and network infrastructure equipment

Mercury exemptions:

Limited amounts in fluorescent and other light bulbs essential for functioning

Medical device exemptions:

Specific applications with demonstrated lack of safer alternatives

RoHS Testing Methods

XRF Spectrometry (X-Ray Fluorescence)

Most Popular Screening Method

How It Works:

High-energy X-rays excite atoms in the sample
Atoms emit "secondary" fluorescent X-rays
Each element emits unique energy signature
Device measures energy spectrum to identify elements and concentrations

Advantages:

Fast analysis (seconds to minutes)
Non-destructive testing
Minimal sample preparation
Handheld devices for on-site testing
Cost-effective screening
Effective for homogeneous materials

Detection Capabilities:

Excellent for heavy metals: Lead, mercury, cadmium, chromium
Can detect total bromine (indicator for BFRs)
Cannot identify hexavalent chromium specifically
Cannot analyze organic compounds (phthalates, PBBs, PBDEs)

Limitations:

Cannot detect light elements (carbon, oxygen)
Cannot analyze molecules or organic substances
Struggles with thin coatings and small components
Detection limits may not meet regulatory requirements for all substances

Chromatography Methods

For Organic Compounds

Gas Chromatography-Mass Spectrometry (GC-MS):

Separates mixture components chemically
Identifies specific organic compounds
Measures concentrations precisely
Required for PBBs, PBDEs, and phthalates
Essential for materials that aren't homogeneous

Advantages:

Precise identification of specific compounds
Can detect very low concentrations
Required for RoHS 3 phthalate testing
Provides quantitative results

Disadvantages:

Longer analysis time
Higher cost
Destructive testing
Requires specialized expertise

Other Testing Methods

ICP-MS (Inductively Coupled Plasma Mass Spectrometry):

Highly sensitive for metal detection
Excellent for lead, cadmium, mercury
Can detect trace elements

ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry):

Fast multi-element analysis
Good for high-volume testing

FTIR (Fourier Transform Infrared Spectroscopy):

Identifies organic compounds
Useful for polymer identification

UV-Vis Spectrophotometry:

Specific for hexavalent chromium detection
Colorimetric analysis

AAS (Atomic Absorption Spectroscopy):

Specific element detection
Cost-effective for single elements

Testing Process and Compliance

Step 1: Material Identification

Identify all homogeneous materials in the product
Create bill of materials (BOM) with material specifications
Document supplier declarations for components

Step 2: Screening Testing

Use XRF for initial screening
Test all homogeneous materials
Identify materials requiring further analysis

Step 3: Confirmatory Testing

Conduct laboratory analysis for screened materials
Use appropriate methods (ICP-MS, GC-MS) for accurate results
Verify compliance for all restricted substances

Step 4: Documentation

Compile test reports
Prepare technical file
Create Declaration of Conformity (DoC)
Maintain traceability records

Step 5: Ongoing Compliance

Monitor supplier changes
Track exemption expirations
Update documentation as required
Implement quality control procedures

Documentation Requirements

Technical File Contents

Manufacturers must maintain technical documentation including:

Product description and intended use
Bill of materials with supplier declarations
Test reports for materials and components
Exemption justifications (if applicable)
Risk assessment documentation
Design and manufacturing specifications
Quality control procedures

Declaration of Conformity (DoC)

The EU Declaration of Conformity must include:

Product identification (name, type, serial number)
Manufacturer's name and address
Statement of compliance with RoHS Directive
Reference to applicable exemptions
Date of issue
Signature of authorized representative
Reference to technical file

Conformity Assessment

Two methods to demonstrate presumption of conformity:

Method 1: Test Data Approach

Include test data for all materials
Demonstrate compliance through analytical testing
Maintain complete material testing records

Method 2: Harmonized Standard (EN IEC 63000:2018)

Risk-based approach
Reduces amount of test data required
Requires documented supplier declarations
Follows IEC 63000:2016 methodology

Global RoHS Regulations

European Union RoHS

Directive: 2011/65/EU (RoHS 2) + 2015/863 (RoHS 3) Scope: All electrical and electronic equipment Substances: 10 restricted substances Enforcement: Member state market surveillance authorities

China RoHS

Regulation: Order No. 39 - Administrative Measures for the Control of Electronic Information Products Key Differences:

Catalogue-based product list (not all EEE covered)
Marking and disclosure requirements
Substances not prohibited, but must be disclosed
Different approach from EU RoHS

Marking Requirements:

Disclosure of hazardous substance presence
Recycling information
Product lifespan indication

Korea RoHS

Regulation: Act for Resource Recycling of Electrical and Electronic Equipment and Vehicles (2007) Features:

Combines RoHS, WEEE, and ELV aspects
Similar substance restrictions to EU RoHS
Covers electrical, electronic equipment and vehicles

California RoHS (USA)

Regulation: Electronic Waste Recycling Act (EWRA) + California Lighting Efficiency and Toxics Reduction Act Scope:

Narrower than EU RoHS
Covers LCDs, CRTs, and specific lighting products
Only four heavy metals (lead, cadmium, mercury, hexavalent chromium)
General purpose lights from January 1, 2010

UK RoHS (Post-Brexit)

Status: Remains aligned with EU RoHS Features:

Similar scope, restricted substances, thresholds, and exemptions
Independent enforcement by UK authorities
UKCA marking may apply (transition period considerations)

Other Regions

India RoHS: E-Waste Management Rules with substance restrictions UAE RoHS: Similar to EU RoHS requirements Taiwan RoHS: Restrictions on hazardous substances in EEE Turkey RoHS: Aligned with EU RoHS directive

Choosing a RoHS Testing Laboratory

Accreditation Requirements

ISO/IEC 17025 Accreditation:

International standard for testing and calibration laboratories
Ensures competence, impartiality, and consistent operation
Required for regulatory compliance testing
Provides confidence in test results

Laboratory Capabilities

Comprehensive Testing Services:

XRF screening and confirmatory testing
ICP-MS for heavy metals
GC-MS for organic compounds
FTIR for polymer identification
Hexavalent chromium specific testing

Support Services:

Technical file preparation assistance
Supplier declaration review
Process audits
Training and consultation
Rapid turnaround times

Global Testing Network

For international manufacturers, choose laboratories with:

Global presence for local testing
Real-time project management
Cost optimization through regional testing
Multi-regulatory compliance testing (EU, China, Korea, California)

Common Compliance Challenges

1. Homogeneous Material Definition

Challenge: Determining what constitutes a homogeneous material Solution: Consult testing laboratory for material identification guidance

2. Expiration of Exemptions

Challenge: Exemptions expire automatically if not renewed Solution: Monitor exemption status and plan for alternatives

3. Supplier Declaration Accuracy

Challenge: Relying on inaccurate supplier information Solution: Verify declarations through testing, implement supplier quality programs

4. Multi-Regional Compliance

Challenge: Different requirements across regions Solution: Test to most stringent standard, maintain comprehensive documentation

5. Phthalate Testing (RoHS 3)

Challenge: New requirements requiring different testing methods Solution: Update testing protocols, ensure laboratory GC-MS capability

6. Traceability Requirements

Challenge: Maintaining documentation across supply chain Solution: Implement IPC-1752 standard for data exchange, use material declaration databases

Benefits of RoHS Compliance

Environmental Benefits

Reduced hazardous waste in landfills
Lower risk of soil and water contamination
Support for circular economy initiatives
Encouragement of green material innovation

Market Benefits

Access to EU and other regulated markets
Enhanced brand reputation
Competitive advantage
Reduced risk of product recalls and penalties

Supply Chain Benefits

Improved supplier quality management
Better material traceability
Standardized compliance documentation
Reduced liability risks

Business Benefits

Demonstrates corporate responsibility
Supports sustainability goals
Meets customer requirements
Future-proofs against stricter regulations

Future Trends in RoHS

Potential New Substance Restrictions

Substances under consideration for future restrictions:

Additional phthalates
Brominated flame retardants (BFRs)
Chlorinated flame retardants (CFRs)
PVC (polyvinyl chloride)

Expanding Scope

More product categories may be added
Exemptions will continue to narrow
Medical device exemptions being re-evaluated

Global Harmonization

Increasing adoption of RoHS-like regulations worldwide
Movement toward standardized testing methods
Mutual recognition agreements between regions

Digital Documentation

Electronic material declarations
Blockchain for supply chain traceability
Automated compliance management systems

Conclusion

RoHS testing is essential for manufacturers, importers, and distributors of electrical and electronic equipment seeking market access in the European Union and other regulated regions. Understanding the ten restricted substances, testing methods, documentation requirements, and exemption framework enables successful compliance strategies.

From XRF screening to confirmatory laboratory analysis, the testing process requires careful planning, supplier management, and ongoing documentation maintenance. The evolution from RoHS 1 to RoHS 3 demonstrates the expanding scope of hazardous substance restrictions, with phthalates joining the original six substances in 2019.

As global adoption of RoHS-like regulations increases, manufacturers benefit from testing to the most stringent standards, maintaining comprehensive technical files, and implementing robust supplier quality programs. ISO/IEC 17025 accredited testing laboratories provide the expertise and capabilities needed to navigate complex regulatory requirements and demonstrate compliance.

The benefits of RoHS compliance extend beyond regulatory access—supporting environmental protection, human health, and sustainable business practices. As the electronics industry continues to innovate, RoHS compliance remains a cornerstone of responsible manufacturing and global market participation.

Frequently Asked Questions

Q1: What is the difference between RoHS 1, RoHS 2, and RoHS 3?

RoHS 1 (2002/95/EC) restricted six substances effective 2006. RoHS 2 (2011/65/EU) expanded scope to all EEE, required CE marking, and added documentation requirements in 2013. RoHS 3 (2015/863) added four phthalates to the restricted substance list effective 2019, bringing the total to ten restricted substances.

Q2: How do I determine if my product is RoHS compliant?

RoHS compliance requires testing all homogeneous materials in your product for the ten restricted substances. Use XRF screening followed by confirmatory laboratory testing (ICP-MS for metals, GC-MS for organic compounds). Document results in a technical file and issue a Declaration of Conformity.

Q3: What is a homogeneous material?

A homogeneous material cannot be mechanically disjointed into different materials. Examples include plastic casing, metal screws, wire insulation, and solder. The concentration limits apply to each homogeneous material, not the finished product or component.

Q4: Can XRF detect all RoHS restricted substances?

No. XRF effectively detects metals (lead, mercury, cadmium, chromium) and total bromine, but cannot identify specific organic compounds like PBBs, PBDEs, or phthalates. It also cannot distinguish hexavalent chromium from other chromium forms. Additional testing methods (GC-MS, UV-Vis) are required for these substances.

Q5: Do batteries need RoHS compliance?

No, batteries are excluded from RoHS scope. Batteries are regulated under the separate Battery Directive (91/157/EEC, updated 2003/0282 COD), which sets specific limits for mercury, cadmium, and lead in batteries and requires recycling programs.

Q6: How often do RoHS exemptions expire?

RoHS 2 introduced automatic expiration for exemptions: typically 5 years for most exemptions and 7 years for medical devices and monitoring/control instruments. Exemptions must be renewed through application to the European Commission before expiration.

Q7: What is the difference between a Certificate of Conformity (CoC) and a Declaration of Conformity (DoC)?

A CoC is issued by a testing laboratory confirming a product passed RoHS tests. A DoC is the manufacturer's formal declaration that the product meets RoHS requirements, based on test results and technical documentation. The CoC provides proof; the DoC is the manufacturer's legal commitment.

Q8: Do I need to test every component in my product?

Ideally, yes—every homogeneous material must comply. However, EN IEC 63000:2018 allows a risk-based approach where you can rely on supplier declarations for low-risk materials, focusing testing resources on materials likely to contain restricted substances.

Q9: Can I sell non-compliant products in the EU?

No. Products that do not meet RoHS requirements cannot be placed on the EU market. Non-compliance can result in product recalls, fines, and market withdrawal. Enforcement is conducted by member state market surveillance authorities.

Q10: Does China RoHS have the same requirements as EU RoHS?

No. China RoHS (Order No. 39) has different requirements: it's catalogue-based (not all EEE covered), focuses on marking and disclosure rather than prohibition, and applies to electronic information products. The substances restricted are similar, but the compliance approach differs significantly.