Conductive Elastomers Provide Excellent EMI/RFI Shielding

Conductive Elastomers

Conductive Elastomers are fully cured silicones or fluorosilicone loaded with electrically conductive particles providing superior EMI/RFI shielding performance combined with excellent environmental sealing. The various conductive fillers are designed to ensure galvanic compatibility whilst providing low contact resistance between mating surfaces.

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Conductive Fillers available for silicone and fluorosilicone

Nickel Plated Graphite: A high quality cost effective commercial material with increased use in the military markets. Easily extruded or moulded. SNG FR grade to UL94 V-0.
Silver Plated Aluminium: An excellent grade high performance material widely used for higher frequency applications in the commercial and military markets. Lighter in weight than some other materials.
Nickel Plated Aluminium: This material offers the best corrosion performance with aluminium metalwork and a high degree of shielding effectiveness with test data up to 40 GHz.

Design Considerations

It is important that this material is not over-compressed. If the design of the equipment does not allow for any mechanicalmethod of preventing over-compression, the gasket should be fitted with built-in compression limiters, either metal stops fitted to the gasket, or metal collars fitted into each fixing hole.
The material is not suitable in sliding applications.
Recommended compression: 10% to 20%.
Self-adhesive backing (conductive or non-conductive) is offered as an assembly aid only.
Fluorosilicone: self-adhesive backing is not recommended for use with this type of elastomer.
Minimum material width should not be less than 2mm or at least the material thickness in any part of the gasketIf this cannot be achieved around fixing holes consider using a slot. Particular attention is required if specifying compression collars in holes.
Consideration must be given to compression forces, hole centres, size and number of fixings and rigidity of mating flanges.
Integral compression stops or collars should be considered to limit over compression if external controls cannot be applied.Recommended minimum sheet thickness for integral limits is 1.5mm.