Kemtron has introduced a RoHS compliant aluminium passivation process for its aluminium honeycomb EMC ventilation panels. The process has eliminated the hexavalent chromium, which is present in some aluminium passivation processes. The new conversion coating meets the requirements of Mil-C-5541E for corrosion and electrical conductivity. The standard panel is constructed from two layers of aluminium honeycomb, set at 90o to each other and mounted in an extruded aluminium frame. Single layer styles are available, offering lower levels of shielding performance in a reduced volume.