1, The Origin and Core Framework of RoHS Certification
RoHS certification (Restriction of Hazardous Substances) is the abbreviation of the European Union's "Directive on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment" issued in 2003. Its core goal is to reduce the harm of waste to the environment and human health by limiting the content of hazardous substances in electronic and electrical products. This directive has been mandatory since July 1, 2006, covering all 27 member states of the European Union and gradually expanding to major global markets.
Core Restricted Substance List
RoHS certification initially set limit standards for six types of hazardous substances:
Heavy metals: lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (Cr ⁶⁺)
Brominated flame retardants: polybrominated biphenyls (PBBs), polybrominated diphenyl ethers (PBDEs)
In 2015, the European Union released the revised version of RoHS 2.0, which added four types of phthalate plasticizers:
DEHP (di (2-ethylhexyl) phthalate)
BBP (phenyl butyl phthalate)
DBP (dibutyl phthalate)
DIBP (Diisobutyl Phthalate)
Limit standards and testing methods
According to EU standards, the limit requirements for six types of basic substances are as follows:
Cadmium (Cd): ≤ 0.01% (100ppm)
Lead (Pb), mercury (Hg), hexavalent chromium (Cr ⁶⁺) PBBs,PBDEs：≤0.1%(1000ppm)
The detection method is mainly based on the IEC 62321 series standards, using X-ray fluorescence spectrometer (XRF) for preliminary screening, and further quantitative analysis of suspected excessive samples through ICP-OES (inductively coupled plasma emission spectrometer) or GC-MS (gas chromatography-mass spectrometry).
2, Environmental compliance challenges of LED linear lights
As the mainstream product in the lighting field, LED linear lights need to cover the entire industry chain from raw materials to finished products in terms of environmental compliance. According to the EU RoHS directive and China's "Management Measures for the Restriction of Hazardous Substances in Electrical and Electronic Products", companies need to establish a control system in the following areas:
Raw material screening and supply chain management
Light source components: LED chips themselves do not contain RoHS restricted substances, but attention should be paid to heavy metal residues in packaging adhesives and phosphors.
Drive power supply: Electrolytic capacitors and PCB board solder are the main risk sources of lead and cadmium, requiring the use of lead-free solder (Sn Ag Cu alloy) and environmentally friendly electrolytes.
Structural components: Aluminum profiles should control the hexavalent chromium content, and plastic shells should avoid using PBBs/PBDEs flame retardants and instead use aluminum hydroxide or phosphorus based flame retardants.
Production process control
Welding process: The halogen content in the flux needs to be monitored during reflow soldering and wave soldering to prevent the generation of dioxin like pollutants.
Cleaning process: It is prohibited to use ODS (ozone depleting substances) such as trichloroethylene. It is recommended to use water-based cleaning agents or semi water-based cleaning techniques.
Waste gas treatment: VOCs generated by reflow soldering need to be treated through activated carbon adsorption and catalytic combustion devices to ensure emissions comply with the "Pollutant Emission Standards for Synthetic Resin Industry" (GB31572-2015).
Finished product testing and certification
Whole machine inspection: It is necessary to disassemble the components such as LED tubes, drive power supplies, and connecting wires, and test the RoHS compliance of each material separately.
Certification process:
Submit samples to CNAS accredited laboratories (such as SGS, Intertek)
The laboratory conducts testing according to the IEC 62321 standard
Provide testing report and RoHS compliance declaration
Add CE and RoHS markings
3, Global Environmental Regulation Collaboration and Industry Trends
International regulatory synergy
The EU REACH regulation requires companies to provide a list of substances of high concern (SVHC), forming complementary supervision with RoHS.
China RoHS 2.0: Implement the "Catalogue for the Management of Restriction of Hazardous Substances in Electrical and Electronic Products" and propose RoHS certification requirements for LED lighting fixtures.
Proposition 65 in California, USA: Set stricter exposure limits for substances such as lead and cadmium, and require companies to label warning labels on product manuals.
Industry technology trends
Halogen free materials: Polyimide (PI) substrates and liquid silicone encapsulation technology are gradually replacing halogen containing flame retardant materials.
Nano coating technology: forming a dense oxide film on the surface of aluminum substrate through atomic layer deposition (ALD), replacing the hexavalent chromium passivation process.
Intelligent detection system: using AI visual recognition technology to monitor the use of harmful substances on the production line in real time.
4, Suggestions for Corporate Compliance Practice
Establish a material database: integrate MSDS (Material Safety Data Sheets) and testing reports provided by suppliers to achieve full lifecycle traceability.
Participate in standard setting: Join IEC/TC111 (Technical Committee on Restriction of Hazardous Substances) to keep abreast of regulatory developments in a timely manner.
Carry out carbon footprint certification: combine RoHS compliance with ISO 14067 carbon footprint accounting to enhance ESG rating.
Layout green supply chain: Prioritize suppliers who have passed UL 2799 (zero waste landfill certification) to reduce environmental risks.
