Gaskets made out of conductive rubber are quite expensive and are also usually less soft than needed for the application. Due to excessive stiffness, the door or lid of the electronics housing will become warped or bent, which then causes electromagnetic leakage. Therefore we have developed gaskets which provide the same functionality while being significantly softer. Gasket size can be up to 2 x 3 meter and even bigger on request.
See here for examples.