What are the EU ROHS testing items for network transformers?
Date：2025-08-05 09:49:01 Classification
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As a key component of electrical and electronic equipment, network transformers (or network filters) must comply with the Restriction of Hazardous Substances requirements of the RoHS 2.0 Directive (2011/65/EU) when exported to the EU. Testing items are divided into two categories based on their material composition (metal and non-metal), as follows:
I. Core Testing Items
1. Metal Components (e.g., pins, magnetic cores, casings)
Four heavy metals to be tested:
- Lead (Pb): Limit ≤ 1000ppm
- Cadmium (Cd): Limit ≤ 100ppm (stricter than other metals)
- Mercury (Hg): Limit ≤ 1000ppm
- Hexavalent chromium (Cr⁶⁺): Limit ≤ 1000ppm
2. Non-metal Components (e.g., coil insulation, plastic frames, encapsulation adhesives)
Ten hazardous substances to be tested:
- The four heavy metals listed above (limits apply to metal materials)
- Flame retardants:
- Polybrominated biphenyls (PBBs): ≤ 1000ppm
- Polybrominated diphenyl ethers (PBDEs): ≤ 1000ppm
- Plasticizers (Phthalates):
- Di(2-ethylhexyl) phthalate (DEHP) ≤ 1000 ppm
- Benzyl butyl phthalate (BBP) ≤ 1000 ppm
- Dibutyl phthalate (DBP) ≤ 1000 ppm
- Diisobutyl phthalate (DIBP) ≤ 1000 ppm
II. Key Considerations
1. Homogeneous Material Separation Testing
- The transformer must be disassembled into individual material components (e.g., copper wire, ferrite core, epoxy resin) and tested separately by material type.
2. Applicability of Exemptions
- Some materials may be exempt (e.g., lead in ceramic components, lead in high-temperature solders). Verification must be made according to Annex III of RoHS.
3. Test Report Validity
- RoHS does not require an official certificate; only a third-party laboratory test report (an EU-recognized ISO 17025-certified laboratory) is required.
- The report must include: product model, list of materials, test standard (IEC 62321), and limit results.
III. Recommended Testing Process
1. Sample Preparation:
- Provide a complete sample and material list (marking the material type of each component).
2. Laboratory Selection:
- Prefer CPSC-authorized or CNAS/CMA-accredited laboratories.
3. Turnaround Time and Cost:
- Routine testing takes 3-5 business days, and the cost is calculated based on the number of materials (approximately 500 RMB/sample for metals and 800 RMB/sample for non-metals).
Summary
The core of RoHS testing for network transformers is material compliance:
- Metal components → Focus on four heavy metals (especially cadmium, which has the strictest limits).
- Non-metal components → Cover all 10 items (including the newly added four phthalates, which are prone to exceeding the limit).
It is recommended to complete combined testing of the entire unit before export to ensure that all materials meet the standards.
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