3M CN4490 0.75" X 7"-100

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RFI and EMI shielding and absorbing materials are used in a variety of different applications, from mobile phone cases to airplane cabins. The 3M CN4490 0.75" X 7"-100 is an example of such a material that is specifically designed for shielding against Radio Frequency Interference (RFI) and Electro-Magnetic Interference (EMI).

The 3M CN4490 utilizes an engineered composite of aluminum and conducting carbon particles that are formed into a flexible, yet durable film material. The synthesized metal layers are electronically etched with patterns that function to attenuate unwanted electromagnetic energy. The electrically controlled patterns are arranged so that electromagnetic waves are partially absorbed and partly reflected away from sensitive electronic circuitry, allowing only desired frequencies and signals to pass through. This process of absorption and reflection works both to reduce the intensity of EMI energy passing through the material, as well as to protect electronic circuitry from being interfered with by unwanted radio frequencies.

The material’s durable construction makes it resistant to moisture, chemicals, and ultraviolet radiation. The self-adhesive backing of the 3M CN4490 also allows it to be easily installed in desired areas. Additionally, to ensure high performance and to prevent premature functional degradation due to environmental forces, the 3M CN4490 is engineered for applications that call for a minimum temperature rating of -25°C to 85°C.

The applications for the 3M CN4490 are numerous and diverse. It can be used in a wide range of electronic products such as computers, radios, navigation units, TV receivers, and amplifiers. Additionally, the material is often used in airplanes, aircraft engines, medical instruments, automotive electronics, portable telecommunication equipment, and even military communications systems. As for the working principles of the 3M CN4490, it is designed to reduce the range and strength of RFI and EMI signals passing through the material by 17-20dB.

In conclusion, 3M CN4490 RFI and EMI shielding and absorbing materials provide excellent attenuation capabilities against EMI and RFI signals and are suitable for electronic product designs which require reliable performance in harsh environmental conditions. The material is made up of an engineered composite of aluminum and conducting carbon particles and is self-adhesive, making it easy to install. Common applications for this material include computers, radios, televisions, aircraft engines, medical instruments, and more. Thanks to its unique patterns, the material works to reduce the strength and range of RFI and EMI signals by up to 20dB.

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