https://www.sciencedaily.com/releases/2018/05/180530113134.htm

The substances are among those applied to devices, such as laptops and music systems, as flame retardants and pigments but remain within the products when they reach the end of their useful lives.

Now scientists at the University of Plymouth have shown that a combination of the growing demand for black plastic and the inefficient sorting of end-of-life electrical equipment is causing contaminated material to be introduced into the recyclate.