In addition to contact finger strips, electrically conductive elastomer gaskets are another important group of shielding material. They are made from an elastomer binder (silicone or fluor silicone) with a conductive fillers. Depending on the technical requirements, the best performing fillers are silver-coated copper, aluminium or glass balls. Pure silver is also available.
A filler with nickel-coated graphite is a good choice regarding the price-performance ratio; the most economical option is carbon-loaded silicone. Elastomer gaskets with conductive fillers have very good attenuation properties between 50 and 120 dB, depending on the product and wave length und act as seals against dust and water. Especially the duo-seal option can achieve high IP class levels.
The gaskets are available as extruded sections, printed or moulded shapes. Depending on size and quantity, rings can be moulded or made as jointed o-rings from suitable profiles. O-profiles can be made with very small diameters and are therefore perfect for enclosures with thin walls.