3M CN4490 0.5" X 8"-250

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RFI and EMI - Shielding and Absorbing Materials have been the focus of attention in EMC engineering due to their importance in preventing hazardous electromagnetic radiation from entering critical systems and components. 3M’s CN4490 0.5" X 8" - 250 material is a sealing material for electronic components with excellent quality. It is a Shielding and Absorbing material with great performance in absorbing and blocking electromagnetic radiation.

Application Field – This material provides an effective shielded enclosure for many kinds of electrical components ; power supplies, capacitors, transformers, wireless device, LED lighting, etc. It is also suitable for RF and EMI shielding applications in EMF radiation containment, such as RF waveguides, microwave ovens , electrical enclosures, hot-speakers, and other high-frequency electronic applications.

Working Principle – The working principle of 3M’s CN4490 0.5" X 8" - 250 Shielding and Absorbing material is based on the theory of electromagnetic field absorption. The material is made of aluminum foil and is designed to be highly conductive and highly resistant to corrosion and abrasion. It has high-dimensional stability which ensures that it can be laminated or layer with other materials. The material also maintains its properties even in extreme operating conditions.

The material is designed to absorb and block the electromagnetic radiation emitted from the electronic components and stop the radiation from propagating and causing harm to the environment. The aluminum foil is placed between two layers of a translucent plastic film, which increases its effectiveness. The plastic film allows for the passage of radiation, but it is largely trapped and absorbed by the aluminum foil. The metal foil also serves as a barrier for electron flow, thus preventing the radiation from entering the critical components it is designed to protect.

The material also features excellent adhesive properties. This makes it suitable for applications where permanent adhesive is required, such as hot-speakers and other environmental RF shielding applications. The material also works great with other materials, such as rubber, paper or plastic, providing additional layers of protection for a wide range of electronic components.

Apart from the shielding and absorbing properties, the material also has other features such as dielectric loss and sound absorption. These properties will help reduce the level of noise emitted from electronic components, providing overall improved sound quality and performance.

In conclusion, 3M’s CN4490 0.5" X 8" - 250 Shielding and Absorbing material has proven to be an excellent quality material for EMF radiation containment and blocking of hazardous electromagnetic radiation. The material works great for many applications, providing effective shielding and absorption, as well as dielectric loss and sound absorption.

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