The soldering process which uses a lead-free solder material is called RoHS or Lead-free Soldering. Lead (Pb) based elements are Mercury, Cadmium, Hexavalent Chromium, Polybrominated Biphenyls, and Polybrominated Diphenyl Ether. Over time these materials can form toxic substances which can threaten human life and the environment.

To avoid the use of Lead (Pb) based soldering materials, the European Union created a directive called RoHS (Restriction of Hazardous Substances) which restricts the use of electronics which use lead-based solder materials.

We are using more and more electronic devices every day. All these devices have components which are connected to a PCB using solder. Lead (Pb) is a dangerous material and it takes very long to decompose. So it is best to try and avoid the use of this material in our daily lives. As a result, most components are soldered on to Metal core PCBs using Lead-Free ROHS solder.