Fraunhofer Representative Office Beijing
Carbon black recycled from car tires
Top, primary product from left to right: raw rCB, clean rCB (96+), pearlized clean rCB (96+). Bottom, secondary products recovered from the ash, from left to right: liquid sodium silicate or "water glass", precipitated SiO2, precipitated ZnSO4.

© Fraunhofer IBP
Until now, waste tires have been used mainly for recovering energy sources: Only small proportions of the carbon black contained in these tires are recycled, since mineral ash accounts for around 20 percent of its content. A new process developed by the Fraunhofer Institute for Building Physics IBP is able to isolate almost all of this ash – allowing both the carbon black and the minerals from the ash to be reused.