3M 1345 CIRCLE-0.75"-250

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RFI and EMI shielding and absorbing materials are of great importance for numerous industries. In this article, we will take a look at 3M 1345 CIRCLE-0.75”-250 and examine its application field and working principle. It is important to note that this type of material is considered to be an EMI/RFI absorber, not a shield, and its function is to absorb rather than block.

3M 1345 CIRCLE-0.75”-250 is a flexible absorber material from the 3M Thinsulate line. This product is available in two-dimensional sheets or strips and is most commonly used as a conformal material over structures and surfaces for EMI/RFI applications. It is composed of an advanced, high-performance non-woven polyester-based backing, and metal-coated layers on top and bottom. The top and bottom layers are made of 99.9% pure aluminum, providing excellent electrical conductivity, while the upper layer is coated with a non-conductive barrier, preventing any possible contact between the metal and an external entity.

The materials have various applications. They are often used to reduce the amount of electromagnetic energy that can escape the device for better radiation pattern control or to provide a controlled absorption of excessive energy. It can also be used for protection against radiated interference in high voltage circuits and to protect components and wiring from effects of electrical voltage or current. This type of material is also often used to meet certification, approval, and regulatory requirements, due to its low electrical resistance and excellent frequency response.

The working principle of 3M 1345 CIRCLE-0.75”-250 is based on the concept of “attenuating fields”. When fields interact with the material, they induce an electric current on the surface of the product, which is then dissipated into the ambient air. This results in a reduction in the overall energy of the field. The attenuation provided by this material can reduce the field strength up to several thousand volts per meter, depending on the configuration and characteristics of the product.

In conclusion, 3M 1345 CIRCLE-0.75”-250 is an important RFI and EMI shielding and absorbing material with a wide range of applications and benefits. It has excellent electrical conductivity, low electrical resistance, and excellent frequency response. Furthermore, it can attenuate fields up to several thousand volts per meter, allowing it to provide protection against radiated interference and reduce energy emissions from a device. Related materials are also available, which can offer further protection and energy absorption.

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