3M CN4190 0.5"SQ-250

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Introduction to RFI and EMI Shielding and Absorbing Materials

Shields and absorbers are used to protect electronic components against the interference caused by Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI). RFI and EMI shielding materials and absorbers are made of a variety of materials such as metal, plastic, and glass for varying shielding effectiveness. These materials can cover a wide range of frequencies and are effective in many applications where the signal needs to be contained in a certain area or inhibited from entering but also needs to protect components from external signals.

3M CN4190 0.5"SQ-250 Application Field and Working Principle

3M CN4190 0.5"SQ-250 is a nickel/glass composite EMI shielding material designed to provide shielding effectiveness against both RFI and EMI. It is one of 3M’s most popular EMI shielding materials, as it is extremely lightweight and thin, and offers excellent shielding effectiveness across wide frequency ranges. It is coated with a pressure-sensitive adhesive for easy installation. The material is typically used in shielding enclosures, cabinets, and rooms, and is also used in applications where a tight electrical bond and good mechanical strength is required.

The material is composed of a conductive nickel foil and a non-conductive glass cloth substrate, both of which are laminated together to form a single sheet. The metal foil is used to block electromagnetic interference from entering or exiting an area, and the glass cloth helps to absorb the interference and reduce its effects. It has a shielding effectiveness of up to -95dB from 0.060 MHz to 10 GHz. The adhesive backing makes it very easy to apply to enclosures, walls, floors, ceilings, and other surfaces, and it can be applied to most types of surfaces. The material is also resistant to chemicals, vibration, and moisture.

The material can be used in many applications, including military and aerospace equipment, cell phone towers, communication sites, medical equipment, and more. It is used to protect against interference from other signals, such as cell phone signals, radio signals, and more. It is also highly effective in reducing interference caused by lightning. It can be used to create an RF-tight shielding enclosure that completely isolates the interior from outside RF signals. It is also used in areas where there is high humidity, as it is highly resistant to moisture.

In summary, 3M CN4190 0.5"SQ-250 is an excellent EMI and RF shielding material. It is lightweight and thin and provides excellent shielding effectiveness across wide frequency ranges. Its adhesive backing makes it easy to install on walls, ceilings, floors, and other surfaces. It is also resistant to chemicals, vibration, and moisture, making it an ideal choice for many applications. Its metal foil blocks electromagnetic interference from entering or leaving an area, while its non-conductive glass cloth substrate absorbs any interference, providing superior protection against both RFI and EMI.

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