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Chomerics Europe has introduced EMI shielding materials that use low-transfer impedance nickel/aluminium (Ni/Al) particle-filled elastomers to provide 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.

The high-reliability levels of the new gaskets help reduce field service and warranty needs, giving total cost of ownership savings in the region of 30 to 40 per cent.

The materials can also overcome the requirement to apply Ni or Tin (Sn) plating to aluminium flanges and housings and may alleviate the need to incorporate secondary outboard non-conductive gaskets and complicated partial-flange painting operations.

Choform 5560 is the FIP version of the new material.

Applied using dispensing technology, Choform 5560 can be placed on narrow flanges and achieves shielding effectiveness of 80 to 115dB.

Narrow flanges can allow for smaller overall package sizes or increased space for PCBs.

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 onto components to reduce costs and simplify assembly.

Both materials have a shielding effectiveness of more than 100dB.

Parts can be moulded with cross sections specifically designed to allow low closure forces to be used.

All three materials have a maximum operating temperature of 125C.

Cho-Seal 6503 also complies with MIL-DTL-83528C for fluid immersion.

Parker Hannifin — Parker Sales UK

With annual sales exceeding $10bn, Parker Hannifin is the world's leading manufacturer of motion and control technologies and systems, providing precision-engineered solutions for a wide variety of commercial, mobile, industrial and aerospace markets.

To meet its customers' needs in motion and control, Parker provides the broadest range of products available from any single supplier. This is supported by expertise in nine major technologies:

  • Hydraulics
  • Pneumatics
  • Electromechanical
  • Filtration
  • Process control
  • Fluid and gas handling
  • Sealing and shielding
  • Climate control
  • Aerospace

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