Summary: In this work the hypotheses that the content of metal in waste printed circuit boards (PCBs) significantly depend on the type of device of its originwas established. Moreoverdue to extraordinary development of information technologies (IT), content of metal in the waste PCB has changed and rations of metals unequallydistributed in particular grain sizes of grinded samples. Finally, a hypothesis that less valuable non-metal fraction (NMF) could be incorporated as a raw material in concrete production was established. Established hypotheses were tested experimentally. The samples of waste PCBs were divided according the type and the age of device of its origin and ration of most important valuable and toxic elements such as Ag, Al, Au, Cu, Ni, Pb, Pd, Pt, Sn and Zn has been determined. Content of metals was determined in PCBs of cell-phones, personal computers, TV sets and other devices. The content of metals was measured in electronic components (ECs) of PCBs i.e. other remained stripped PCBs bases. Samples of PCBs from cell-phones, personal computers and TV sets were divided according to the age of devices of its origin, so hypothesis on change of metal use with technology was tested. All tests have been performed on grinded and divided samples in four classes: 4/1 mm; 1/0,5 mm; 0,1/0,5 mm and -0,1 mm. In order to determine usefulness of waste NMF of PCBs, the impact of ration of NMF on concrete strength was studied. The study was conducted by determination of compressive strength of probationary bodies made in laboratory and tensile strength of pavements manufactured in industrial scale. NMF remained after PCB treatment in a Croatian pilot-plant facility was used. In laboratory and industrial facilities, 5 %, 10 %, 15 % and 20 % of mass of mineral filler was replaced with NMF. Eco-efficiency of hazardous compounds contained in NMF was encapsulated and has been validated by leaching tests probes of concrete prepared with NMF in the filler. Due to determined content and trend of variation of metal ration in waste PCB it is obviously that results has been influenced by space characteristics, time and social conditions. It was determined that ration of particular elements in waste PCBs depends as well as on origin and the age of device. Ration of metals in particular classes of grinded samples has been different significantly, as well as rations of metals in ECs and remained stripped bases. It was determined that stripped bases of PCBs still contained significant amounts of metals. Tests of concrete strengths prepared with NMF in the filler have shown that with determined receipt applicable concrete can be manufactured but with increase of NMF rations its strength decrease. On the basis of leaching test it was found out that by incorporation of NMF in concrete hazardous metals has been incorporated very successfull ywith the intensive leach out of sulphates and other soluble concrete components at the same time. In order to find commercial solution it is necessary to perform further studies under condition of revising of receipt and within the range of NMF ration up to 5 %.