New soft silicone flat EMI gasket material
20 December 2016
Kemtron's flat, sheet material, comprises a solid silicone rubber, embedded with Monel or Aluminium metal wires orientated perpendicular to its surface.
Excellent RFI/EMI/EMP shielding performance is achieved as the material has a wire density of up to 140 wires/ CM2 in solid silicone providing an environmental and RFI/ EMI seal when clamped between two metallic surfaces. These wires are crimped to aid compression and are chemically bonded to ensure their retention. They will also penetrate most light oxide layers, ensuring a low contact resistance path when suitably compressed.
For applications with severe joint unevenness, low closure forces, and where greater compressibility is required, Kemtron have developed new grades 470/480 of material to fulfil a need that meets the performance of our oriented wire in silicone sponge but with improved environmental sealing qualities. We have achieved this by using a very soft solid silicone with a reduced wire count of 100 wires per cm2 the same as our silicone sponge. The advantages of these materials over silicone sponge are that we can manufacture sheet widths of 225mm with a minimum thickness of 0.8mm. Material consistency is a great advantage over silicone sponge as there is no uneven cell structure to consider that affects moisture ingress and closure force.
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