Aluminium-friendly EMI gaskets

Chomerics Europe has introduced new EMI shielding materials that use low transfer impedance nickel aluminium (Ni/Al) particle filled elastomers to give high levels of shielding effectiveness.

Available as moulded, extruded and form-in-place (FIP) gaskets, the new materials also offer high stability and excellent galvanic compatibility with aluminium. This means that pitting due to galvanic erosion is significantly reduced compared with applications that use silver aluminium (Ag/Al) filled elastomers.

ChoForm 5560 is the FIP version of the new material. Applied using dispensing technology, it can be placed on narrow flanges and achieves shielding effectiveness of 80 to 115dB. The material has low compression set for long-term sealing and is extremely soft; this lowers closure force requirements and in some applications may eliminate the need for fasteners and more rigid housings.

Cho-Seal 6502 (silicone) and 6503 (fluorosilicone) are available as moulded or extruded gaskets, they can also be over-moulded directly on components to reduce costs and simplify assembly. Both materials have a shielding effectiveness of over 100dB.
 

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• Chomerics Europe

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