<div>In protoplanetary disks, inter-particle collisions in dust clouds lead to charge transfer due to tribocharging effects. This charge transfer generates strong local electric fields and creates complex charge patterns on the individual particle surfaces. The electric forces acting on the dust can significantly impact further particle evolution within the cloud. It might especially promote agglomeration of sub-mm particles that would only bounce off each other without the additional electric forces. This is important in the early stages of planet formation. <br></div><div>We investigate the charging and agglomeration processes of sub-mm basalt and glass spheres with an experiment that was carried out on a suborbital flight (ESA MASER 15). Before launch, the particles were agitated to electrically charge them. During the six minutes of microgravity the beads were able to move freely through four different experiment cells, respectively. These cells were agitated individually during the flight to induce inter-particle collisions or disperse the sample within the cell volume. Besides, an electric field could be applied to determine the charge on single particles and aggregates through their movement within the field. <br></div><div>We were able to observe the process of growth from individual particles to cm-sized agglomerates. First, monomers build small clusters that, in turn, stick to each other and get compacted by agitated impacting single particles. The subsequent interactions between the cm-agglomerates and the remaining single particles at different stages of agitation will be used to analyze the stability of those agglomerates at different impact velocities. These first observations already show that electric charging has a great impact on particle agglomeration.</div>