3M CN4490 0.125" X 54.5YD

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Overview

RFI and EMI - Shielding and Absorbing Materials are essential components for electronic systems to minimize and reduce the effect of electromagnetic interference (EMI), a prime source of failure in modern digital technologies. 3M CN 4490 0.125” X 54.5YD is a specification of electromagnetic shielding and absorbing material developed by 3M and has long been used in various industries. In this paper, we will discuss its application fields and principles.

Application Field

3M CN 4490 0.125” X 54.5YD has been widely used in various industries because of its high performance and effectiveness. The primary application field is the defense industry, where the material is used to block out signals of all enemies and allies at the same time, guaranteeing information security. Moreover, 3M CN 4490 0.125” X 54.5YD has also been used in telecommunications. This material can not only provide signal protection, but can also cut down background noise to ensure a clearer voice reception. In addition, 3M CN 4490 0.125” X 54.5YD is also used in medical imaging systems and flat panel TVs. Its flexibility and light weight make it suitable for various types of installations. Lastly, 3M CN 4490 0.125” X 54.5YD is also ideal for sound recording purposes, where complete sound blocking may be necessary to keep the audio signal clean from all possible sound sources.

Working Principle

3M CN 4490 0.125” X 54.5YD does not provide a complete signal blocking due to its low metallic content. Instead, it selectively attenuates a wide range of EMI frequencies along with providing ESD protection. As the EMI interference signal penetrates the shielding material, the signal is absorbed and dissipated, causing it to diminish or cancel out.The shielding material is structured with multiple layers of metals, insulation and other components that ensure optimal EMI protection. The metal layers are treated with a polyester coating that prevents oxidation and other degradation to ensure a higher fidelity of signal attenuation. The insulation present in between the layers helps reduce the amount of electrical energy that passes through it and prevent the electrical current from flowing through the insulation layers. The noise reduction capabilities of the 3M CN 4490 0.125” X 54.5YD is also attributed to its composite construction. This shielding material is composed of a woven metallic mesh that enables the braid to expand and contract; the mesh web also prevents entanglement of adjacent materials and allows flexibility. As the braid expands and contracts, it traps ambient noise and the noise is then dissipated to create a noise-cancelling effect.

Conclusion

In conclusion, 3M CN4490 0.125” X 54.5YD is a versatile shielding and absorbing material that is widely used in the defense industry, telecommunications, medical imaging systems, flat panel TVs and sound recording purposes. With its multiple layers of metals, insulation and other components, it can effectively attenuate a wide range of EMI frequencies and reduce ambient noise.

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