One has to follow the below steps for the Lab testing Process for ROHS:
Step 1: Collect all the representative samples of the product and its components. Separate the product into different materials like plastic, metal, and solder. Ensure the sample is uniform for accurate testing.
Step 2: Identification of RoHS-Regulated Substances should be done along with the restrictions on 10 hazardous substances:
- Lead (Pb) – 0.1% (1000 ppm)
- Mercury (Hg) – 0.1% (1000 ppm)
- Cadmium (Cd) – 0.01% (100 ppm)
- Hexavalent Chromium (Cr⁶⁺) – 0.1% (1000 ppm)
- Polybrominated Biphenyls (PBB) – 0.1% (1000 ppm)
- Polybrominated Diphenyl Ethers (PBDE) – 0.1% (1000 ppm)
- Bis(2-Ethylhexyl) Phthalate (DEHP) – 0.1% (1000 ppm)
- Butyl Benzyl Phthalate (BBP) – 0.1% (1000 ppm)
- Dibutyl Phthalate (DBP) – 0.1% (1000 ppm)
- Diisobutyl Phthalate (DIBP) – 0.1% (1000 ppm)
Step 3: There are mainly two methods for RoHS testing:
Screening Tests: It is a fast and cost-effective method but has limited accuracy for phthalates and Cr6+.
- X-Ray Fluorescence: Rapid, non-destructive method to detect elemental composition like lead, cadmium.
Analytical Chemical Tests: It is highly accurate and compliant with RoHS standard, but very time consuming and expensive.
- ICP-OES (Inductively Coupled Plasma Optical Emission Spectroscopy): It measures heavy metals like Pb, Cd, and Hg.
- GC-MS refers to Gas Chromatography-Mass Spectrometry: It identifies and quantifies organic compounds like PBB, PBDE, and phthalates.
- UV-Vis Spectroscopy: It analyzes hexavalent chromium with a colorimetric reaction.
Step 4: Compare measured concentrations with RoHS limits by Preparing a Compliance Report by various:
- Test methods and equipment used.
- Substance concentrations.
- Pass or Fail status for each material
Step 5: The documentation step is important during the lab testing process. If the reports complies with the RoHS Directive:
- It can serve as evidence to support the Declaration of Conformity.
- The Declaration of Conformity with all the technical documents will be valid to show RoHS Compliance for as long as the product stays RoHS Complaint.
If the product fails:
- Identify all the non-compliant components.
- The product should be modified and re-tested.
Step 6: Under Ongoing Compliance process:
- Periodic testing should be conducted for product updates.
- Maintain a RoHS compliance management system.