The technological progress has brought to the development of electronic command circuits always more sophisticated, able to realise the automation of more varied productive processes. The presence of control and command circuits in hydraulic and pneumatic systems required the study and the realisation of special compounds for O-Rings. These compounds combine the seal properties with electrical property as to not induce electromagnetic disturbances in the circuits, and they are able to carryout adequate protection from electronic noise. For the realisation of such compounds, they are added to an elastomer base which must also respond to the requirements from the exercise conditions like the compatibility with the fluid, load with the elements such as silver, copper and graphite, at the end to appoint a low resistance.
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