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Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI) are two closely related forms of interference that can potentially have serious consequences to electronic devices. The basic difference between RFI and EMI is that RFI is caused by a signal on one or more frequencies, while EMI is caused by a combination of many different frequencies. In order to help prevent and protect against these types of interference, a number of different contact materials are used, including contacts, fingerstock, and gaskets.

Contacts are materials used for making electrical connections between two parts. They come in a variety of shapes and sizes, depending on the application. Most contact materials are made of metals like copper, aluminum, or brass, and may also include alloys and plastics. Metal contacts can help ensure a secure connection between two parts and provide protection against RFI and EMI interference.

Fingerstock is a type of contact material that is made for use in circular or other recessed designs. Fingerstock consists of metal strips or plates that are soldered together to form a continuous loop. The loop is then placed into a recessed slot on the circuit board and securely fastened. Fingerstock provides an easy way to make electrical connections without having to make individual soldering connections. It also helps minimize RFI and EMI interference.

Gaskets are also used in contact materials. They are usually made from synthetic rubber or other flexible materials and are used to fill any gaps between two parts and replace any air that could be present. Gaskets help to provide a tight seal and also help prevent RFI and EMI from entering the circuit board.

The use of contacts, fingerstock, and gaskets in RFI and EMI applications is essential for ensuring optimal performance and protecting a device from interference. While all three contact materials offer some protection against interference, the best protection is to use a combination of all three. Contacts provide a secure electrical connection between two parts, fingerstock provides a recessed area where electrical connections can be made, and gaskets provide a tight seal to prevent any RFI or EMI from entering the device. By combining all three of these contact materials, a device can be ensured a high level of protection against interference.

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