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Faraday shielding is a process of containing and preventing various electromagnetic signals from entering or leaving an area. The equipments use to achieve this are known as contact materials. contact materials usually fall into three categories: contacts, fingerstock, and gaskets.

Contacts

Contacts are conductive materials that provide the electrical connection between either an inward or outward signal. Usually made of various metals such as silver, copper, brass, or aluminum, contacts are used in many electromagnetic shielding products. Contacts can be manufactured from a wide variety of materials and can be made with different electrical properties. Some contacts are designed and manufactured with more uniform electrical resistance across the entire surface than other contact materials.

Fingerstock

Fingerstock is a type of contact material used in shielding products. It is most often used to form a physical connection between two dissimilar materials. This connection is often used to create an electrical contact between the two materials or to fill a gap in the shielding application. Fingerstock is generally made from beryllium copper, brass, nickel silver, stainless steel, copper, bronze, or aluminum and is typically used in EMI and electrostatic discharge (ESD) applications.

Gaskets

Gaskets are another type of contact material used in shielding applications. Gaskets create a physical barrier between two surfaces while still allowing electrons to pass between the surfaces. Gaskets are generally made from neoprene, rubber, silicone, fibreglass, or polymers and are used to manage unwanted EMI, reduce vibration, prevent dust and dirt from entering the device, and reduce heat transfer. Gaskets also help seal out water and corrosive chemicals, improving the overall durability of the enclosure.

Applications and Working Principle

The use of contact materials in Faraday shielding is mainly to provide an electrical connection to allow an inward or outward signal to pass through and reduce electromagnetic interference. Contacts, fingerstock, and gaskets all work together to create a shield from incoming or outgoing electromagnetic signals. The basic working principle of Faraday shielding is that the contacts will provide a physical connection between two surfaces while the fingerstock will fill any gaps between those surfaces, and the gaskets will provide a seal along the edges of the contact materials to reduce vibration and dust. The combined effect of the contact materials creates a barrier between the two signals, preventing any external electromagnetic signals from entering or leaving the protected area.

Contact materials play an important role in many Faraday shielding applications. Contacts, fingerstock, and gaskets are used to create a reliable seal that will reduce unwanted EMI, prevent vibration, and keep dust and debris away from the electronics. When used properly, contact materials can provide a superior level of shielding and improve the reliability of the system.

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