Stress-corrosion of glass fibers is performed using a NTNU-built rig, described elsewhere . The rig is operated by pushing fibers with a rod in the distilled water environment. The pushing rod has to be covered with a polymeric coating in order to avoid erroneous stress-corrosion results due to leaching of ions into the distilled water. Si is the main element by which the stress-corrosion via HR-ICP-MS can be monitored, meaning that leaching of Si should be avoided from the rod or the coating. The stress-corrosion rig is shown in Figure .