RoHS Certification – The Auditing Process
The European Union passed the Restriction on Harmful Substances (RoHS) directive to lessen the ecological impact of the rising volumes of “e-waste” generated when electronic devices reach the end of their useful lives and are sent to the vast skyscraper recycling facility. This regulation is an edict that forbids the use of a few certain materials in any electronic devices created after a specific date (with some exceptions allowed for some applications like medical devices). Even though it is relatively easy for a manufacturer to guarantee that their process is free of these elements, relatively few manufacturers are vertically integrated, making it frequently necessary to qualify parts that have been obtained from various subcontractors and suppliers to achieve RoHS certification for a device.
It is only natural that the main instruments for RoHS audits are chemical analysis methods as RoHS certification is purely based on the presence or absence of certain components in a given item. The elemental nature of several of the prohibited materials, such as lead, mercury, cadmium, and chromium, makes it simple to identify them using techniques like energy dispersive spectroscopy (EDS) or x-ray fluorescence (XRF). This examination can even be carried out in situ, without the need for destructive sample preparation, depending on the size and shape of the device to be examined. One or more of these methods may be used by many manufacturers as an in-line auditing solution, allowing products to be validated as they are received from suppliers rather than after they have been put together into a finished product.
The remaining RoHS-restricted compounds are more complex to identify because they are molecular. Due to their relatively negative ecological and health effects, polybrominated biphenyls and polybrominated diphenyl ethers (PBBs and PBDEs, respectively) are both prohibited from use by the RoHS directive. However, elemental analysis techniques cannot reliably identify them because there are relatively harmless compounds containing bromine that are not prohibited from use. Instead, a method like Fourier transform infrared spectroscopy (FTIR), which frequently necessitates destructive sample preparation, must be utilised to examine the molecule as a whole.
RoHS certification is a valuable task for any electronics producer, even though it can be costly and time-consuming. In addition to being the right decision for a multinational corporation, it also allows access to markets that would otherwise be closed off because of the RoHS directive. RoHS certification, carried out either internally or by a third party, is the first step in the right path for manufacturers looking to make the “lead-free jump” and produce compliant products.
