Automotive non-exhaust emissions, such as brake wear are of rising interest, since they will be regulated for the first time with the EURO 7 regulation. While the majority of the particle mass of these abrasion derived particles is between 1 and 10 μm, a considerable percentage of the particle number is also generated in the nanoparticle range (Grigoratos and Martini, 2015). These particles can penetrate deep into the lungs, where they deposit in the alveoli and eventually reach the bloodstream via the blood-air barrier (Bachler, 2015). In this study from the ULTRHAS campaign the chemical and physical properties of brake wear particles emitted from a newly developed custom build EURO 7 brake dyno were characterized. Non-asbestos organic brake pads (NAO), as well as low metallic brake pads (LM), were compared regarding emitted particle mass (PM), particle numbers (PN), as well as their size and morphology utilizing the WLTP bake cycle on a newly build custom brake dyno. Figure 2 shows the setup of the brake dyno, as well as the measurement setup from the ULTHRAS campaign. Quartz fibre filters were extracted and analysed for polycyclic aromatic hydrocarbons by GC-MS/MS to see if high local temperatures lead to their generation at the brake interface due to thermal degradation of the polymer binding matrix of the brake pads. ICP-MS was used for bulk analysis of heavy metals, in combination with SEM-EDX for individual elemental particle spectra, to give a broader understanding of the highly metallic nature of brake wear derived particles. Figure 2 depicts a typical SEM micrograph of a brake wear particle from a NAO pad, showing rough edges commonly found for abrasion derived particles. This research is funded by dtec.bw – Digitalization and Technology Research Center of the Bundeswehr [project MORE] and by the project ULTRHAS – ULtrafine particles from TRansportation – Health Assessment of Sources, Grant Agreement No. 955390. We acknowledge financial support by Universität der Bundeswehr München.    «

Automotive non-exhaust emissions, such as brake wear are of rising interest, since they will be regulated for the first time with the EURO 7 regulation. While the majority of the particle mass of these abrasion derived particles is between 1 and 10 μm, a considerable percentage of the particle number is also generated in the nanoparticle range (Grigoratos and Martini, 2015). These particles can penetrate deep into the lungs, where they deposit in the alveoli and eventually reach the bloodstream...    »