Printed circuit boards are the essential part of almost all electrical and electronic equipment systems. They usually contain various metals such as Cu, iron (Fe), Pb, zinc (Zn), gold (Au), silver(Ag), platinum (Pt), etc. (Gullett et al., 2007).
The organic part in printed circuit boards is mainly thermoplastic with contents of
flame retardants.
It is not easy to recycle printed circuit boards.