EMI Shielding/

EMI Shields

EMI shields are materials or products used to redirect or absorb electromagnetic interference in order to protect sensitive electrical devices. Electromagnetic interference, or EMI, refers to the magnetic field which is created by electrical currents. EMI can travel through wires, electrical circuits and conductors, and is created, to various degrees, by everything that can conduct electrical energy; examples of which include electrical wires, electrical appliances, computers and all electronic equipment.

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Spira Manufacturing Corporation
North Hollywood, CA
818-764-8222
Spira Manufacturing Corporation has been serving the community with quality EMI shields since they were established in 1978. Spira's commitment to quality is demonstrated through our ISO-9001:2008 and AS9100 certifications. Our products also meet requirements of RoHS, DFAR, and others. For more information, please visit our website or contact us by phone.
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Compac Development Corporation
Bay Shore, NY
888-546-3313
In choosing Compac Development Corporation, you receive numerous features including custom "build to print" capabilities, prototype-to-production, E applications support as well as standard and off-the-shelf enclosures. If you are looking for the perfect EMI shields for your next product, Compac has the solutions you have been searching for. Call or visit today!
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Magnetic Shield Corporation
Bensenville, IL
888-766-7800
As application needs for EMI shields continue to grow, we are presented with a stimulating and challenging future. It has been an exciting first 65 years for Magnetic Shield Corporation and as an ISO 9001:2008 Certified company, we look forward to maintaining our "Preferred Source" leadership role in the years to come. For information on our products and services, please call.
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INTERMARK (USA), Inc.
San Jose, CA
408-971-2055
INTERMARK (USA) Inc. is an industry leader in producing the quality EMI shields you need for your business. This company stays on top of all of the changes is technology to make sure their products remain effective and up to date. When you choose INTERMARK, you choose a company with a devoted staff that will work hard to make sure all of your needs are met.
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Dexmet Corporation
Wallingford, CT
203-294-4440
Dexmet Corporation's solid customer base is predicated upon its reputation as the premier, quality supplier of EMI shields. Our quality system is driven by the needs of our customers. We have adopted many suggestions from our customers and will continue to do so. Our employees will focus on high quality standards and consistency through effective process control.
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Sealing Devices Inc.
Lancaster, NY
716-684-7600
Technology has always played an important role at Sealing Devices. Management is always looking to invest in technology to provide better customer service, control costs and improve operating efficiencies. They want to make sure that the EMI shields you receive come with the best quality, service and prices in the business. Call or visit their website today for more information.
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Equipto Electronics Corporation
Aurora, IL
800-204-7225
If your requirements for EMI shields involve heavy duty enclosures for electronics, then Equipto has the products for you! This ISO 9001:2008 certified company can customize any standard product or manufacture to meet your specs for quantities small or large. Rely on these superior RoHS compliant shielded cabinets for the highest EMI/RFI protection available!
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View A Video on EMI Shields - A Quick Introduction

EMI Shields

There are many different types of EMI shields, such as gaskets, filters, enclosures and coatings, each of which work best for different applications. EMI gaskets, for instance, are best suited for more industrial applications against EMI which penetrates cracks, gaps and seams to cause equipment malfunction and failure. Alternatively, medical and electronics industries utilize EMI filters to prevent equipment malfunction or lost communication signals. In addition, EMI enclosures work best for applications such as circuit board housings, central processing units, laptops and mobile phone housings, while EMI coatings are beneficial for wire insulation, circuit boards and onto the interior of small enclosures of integrated circuits. In addition, there are a variety of different materials that serve as EMI shields, each with their own advantages.

The various EMI shields function in different ways, and are fabricated from materials with high magnetic permeability, which enables the material to absorb magnetic energy. Some common EMI shield materials include Mu Metal, Permalloy, polyurethane foam and epoxy casting resin. EMI enclosures, however, are typically made from aluminum, stainless steel, copper or nickel alloys. This type of EMI shield serves to surround the equipment which needs to be shielded, absorbing or blocking harmful EMI. EMI gaskets, on the other hand, are commonly constructed from electrically conductive rubber, metal or ceramic materials that are then combined with EMI shielding metals. As an EMI shield, an EMI gasket functions to seals cracks, gaps and seams in equipment against EMI penetration. Conversely, EMI filters are manufactured from perforated or mesh EMI shielding materials and serve to block EMI which is passed along isolated power lines and power signals, thus diminishing electromagnetic "cross-talk" between various electrical devices that run off the same power source. Lastly, EMI coatings are often referred to as "metal inks," containing copper, nickel or chromium alloys. In order for an EMI coating to become an effective EMI shield it must be sprayed on to a housing or material. EMI coatings are the most flexible type of EMI shield because they can be spray-coated to any number of enclosures, areas and insulators.