RoHS Art. 4 stipulates that electrical and electronic equipment (EEE) of categories 1 – 11 placed on the market - including cables and spare parts for its repair, its reuse, updating of its functionalities or upgrading of its capacity - shall not contain the below substances (RoHS Annex II) in concentrations exceeding certain threshold limits (values in brackets) in any of its homogeneous materials:
- Cadmium (0,01 wt.%)
- Lead (0,1 wt.%)
- Hexavalent Chromium (0,1 wt.%)
- Mercury (0,1 wt.%)
- Polybrominated bi phenyls (PBB) (0,1 wt.%)
- Polybrominated diphenylether (PBDE) (0,1 wt.%)
Comment: The heavy metals listed above (first four substances) are also regulated in the ELV-Directive with the same threshold Levels.
- Di (2-ethylhexyl) phthalate (DEHP) (0,1 wt.%)
- Buty lbenzyl phthalat (BBP) (0,1 wt.%)
- Di butyl phthalate (DBP) (0,1 wt.%)
- Di isobutyl phthalate (DIBP) (0,1wt.%)
For compounds containing the above regulated substances, the threshold values are calculated using the weight of the regulated substance in the compound, not the total weight of the compound. If a homogeneous material contains, for example, lead oxide (PbO) the lead content is calculated for the lead in the lead oxide, not for the lead oxide.
Lead is the most relevant regulated substance for piezo and other ceramics. Due to the exemptions on Annexes III and IV, it may still be used nevertheless.
RoHS Annex II will be revised every four to five years. Substances contained in EEE are assessed and evaluated whether they have properties that justify adopting them to Annex II. The next revision of Annex II ca be expected for 2020 or 2021.