Contact strips for shielding enclosures from EMI/RFI
14 February 2001
Circuit & System Protection
Bavaria Elektronik has available contact strips used to close and thereby shield gaps between two surfaces. For optimum shielding performance, the contact strip must be in a position to span the min and max gap. The right strip is selected if its height is 20% greater than the max gap and if it can be suppressed to the min gap.
The contact strips are made from beryllium copper which has good spring quality, material strength and flex survival. Further advantages are corrosion resistance and self-cleaning of contacts by opening and closing. Beryllium copper is not damaged by air, ozone, solvent, UV light or even by nuclear radiation. It is suitable for a wide temperature range and shows superior thermal and electric conductivity. In comparison to other EMI/RFI gaskets, the manufacturer says these contact strips are lighter and require less closing force.
Inflammable and free from outgassing, the wide assortment with different designs and the simple installation create a universal shielding gasket. It is simple to install as it comes in clip-on and double sided adhesive tape mounting versions.
The adhesive tape can be used up to 120°C and many clip-on strips can optionally be provided with lances to enhance fixing. Mounting holes allow screw or rivet support and soldering or spot welding can ensure superior transition. With all installation methods electrochemical reactions must be considered to avoid galvanic corrosion. Surface coatings are available to help to eliminate this.
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