Vero Technologies has introduced internal coatings which can be applied to the company's standard plastic enclosures which are available in different styles and sizes. The enclosures can be modified to accept displays, switches, and connectors. However, if radiation emitted by the housed electronics is a potential problem, moulded enclosures offer no inherent attenuation to the passage of electromagnetic fields, claims the company. The three alternative internal coatings provide varying levels of attenuation. The default coating is a 10 or 20µm silver-coated copper particle coating, which attenuates by 78dB at 10GHz, and a 50µm nickel coating provides 50dB attenuation at 1GHz. The 22.5µm silver coating provides attenuation of 80dB at 1.5GHz. It provides shielding against RFI and EMI and can act as a ground plane to protect against ESD. A tongue and groove structure between the mating halves of an enclosure forms a complex path. Removable end panels are secured into an interference fit slot or, if fixings are used, a conductive gasket should be fitted to the mating surface. The rear face of plastic panels will have to be conductively coated, or if aluminium panels are used, the front surface will be anodised and the rear left with a natural finish or iridised, a RoHS-complaint conductive finish.
