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EMI Shielding Manufacturers and Companies

IQS Directory is a top industrial directory listing of leading industrial EMI shielding manufacturers and suppliers. Access our comprehensive index to review and source EMI shielding manufacturers with preview ads and detailed product descriptions. These EMI shielding companies can design, engineer and manufacture EMI shielding to your specifications and application need. A quick and easy to use request for quote form is provided for you to contact these EMI shielding manufacturers and suppliers. Each company has detailed profile information, locations, phone number, website links, product videos and product information defined. Read customer reviews and product specific news articles. We are the right resource for your information requirement whether its for a manufacturer of emf shielding, magnetic shielding, emi grounding.

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Spira Manufacturing Corp. offers the most reliable EMI gaskets & shielding for the electrical / electronic industries to meet required EMC/EMI shielding regulations. We have been providing reliable, cost-effective EMI & RFI shielding solutions for over 30 years, and to this day we continue to provide EMI products with innovation & expertise. Spira is an AS9100 and ISO 9001:2008 certified company.
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Established in 1976 as versatile EMI shielding products manufacturers, Compac Development proudly offers speedy and reliable delivery that sets them apart from other leading companies. With a wide range of products offered, Compac Development strives to meet assorted applications, but also offers custom options for unique situations so that all individual needs can be met.
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Magnetic Shield Corp. is an ISO 9001:2008 certified supplier of choice for low frequency electromagnetic shielding solutions. As of 2016, we served customers worldwide for 75 years. We supply custom fabrications, specialty alloys, and products - MuMETAL®, Co-NETIC®, AA CABLE SHIELD®, NEW MuMETAL® Deep Draw Coil, NEW MuMETAL® Round Bar and more. Our technical team can help with material selection and design-drawing reviews.
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We are fully 9001:2008 certified, and we are driven by our customer's needs. We take all suggestions from customers and have implemented many of their ideas into our new products and designs. We can help find the right EMI shielding products that you want, at the right price and quality level. Contact us today for more info or visit our website!
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We have manufacturing experience dating back to 1963 and our staff will work with you to determine the best EMI shielding solutions for your application. It is our goal to exceed your expectations and you will not be upset with the products you receive. We are a flexible manufacturer who will work with you on your time table.
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Sealing Devices is a leading North American distributor and fabricator of EMI shielding products, including conductive elastomers, Soft-Shield® low closure force gasketing, windows, conductive adhesives, formed-in-place parts, vents as well as elastomers, pads and tapes used for managing related thermal applications. The company is ISO 9001:2008 registered.
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Industry Information

The New Master Bond MB600S EMI Shield

EMI shielding is a necessary part of the industrial world, protecting objects from magnetic and electrical interference. There are many ways to shield products, from panels to a thin coating that provides EMI shielding with just a few coats.

Master Bond has created a new conductive coating system that offers EMI shielding, temperature resistance, and easy application. Of all the EMI shielding companies in the world, Master Bond has created one of the first innovative products in some time.

Master Bond MB600S is manufactured using one component- sodium silicate. The coating is silver and fully conductive, offering effective shielding and temperature resistance up to 700 degrees Fahrenheit. The coating is easy to apply, making it versatile and effective on any possible object.

The coating is completely aqueous-based, and is formulated for applications where any form of EMI or RFI shielding is necessary. As a water-based coating, it is non-toxic and easy to handle. The coating is effective at shielding with a range of 95-105 dB, from 100 MHz to 2 GHz. For above 2 GHz, the shielding decreases to 60-80 dB. It is possible to apply the coating by brushing or spraying. Spraying the coating makes it more effective than brushing.

It takes about 48 hours for the coating to set and become an effective shield. It can resist a variety of temperatures from 0 degrees to 700 degrees Fahrenheit.

Any company looking for an effective brush or spray on EMI shield will appreciate the versatility and protection that the Master Bond MB600S can bring.

EMI Shielding

EMI shielding is an enclosure, coating or transmitted signal which protects electronic equipment from ambient electromagnetic interference. EMI, or electromagnetic interference, is the magnetic field which is created by electrical currents; EMI can travel along wires, electrical circuits and conductors, while radio frequency interference (RFI) is radiated electromagnetic "noise" which travels through the air as radio waves. Both EMI and RFI cause the same effect.

EMI enclosures, RF absorbers, EMI coating, EMI gaskets and EMI filters are used as magnetic shielding and RFI shielding to guard sensitive electronic equipment. EMI and RFI are created, by widely varying degrees, by everything which conducts electrical energy, including electrical wires, electrical appliances, computers and all electronic equipment. Signal-bearing electronic devices such as mobile phones give off RFI. Normal electrical currents are disrupted when moderate to high levels of EMI or RFI are introduced; un-channelled electromagnetic signals and radio frequency waves can act as "noise", magnetically altering normal flow of electrical currents and impeding the flow of electrical energy.

With circuit boards and CPUs, most problematic EMI comes from electromagnetic cross-talk between different components on the same board as EMI travels across wires and conductive materials. Shielding sensitive electronic equipment from electromagnetic interference (and shielding high EMI-emitting equipment from contaminating other equipment) can be achieved by enclosing equipment in a conductive EMI absorbing material (EMI enclosure) or by coating equipment or equipment enclosures with EMI coating. EMI enclosures and EMI shields are also called magnetic shields, and may be made from metals with high magnetic permeability, which is the ability to absorb magnetic energy. Metals such as nickel, copper, steel and aluminum are commonly used, although the industry standard electromagnetic shielding material is Mu-Metal®, an alloy of nickel, iron, copper and molybdenum. Many industries depend on EMI shielding products to protect communication systems, such as hospitals, telecommunication, stage production, sound production and many others.

EMI enclosures, or "faraday cages" surround the equipment which needs to be shielded, absorbing harmful EMI and RFI. EMI enclosures are generally constructed from aluminum, stainless steel, nickel or copper alloys. Enclosures and shields built to block EMI need not be solid; perforated metals are often sufficient, as long as the surface's holes are smaller and closer together than the electromagnetic waves it is meant to block. Microwave doors are a good example of this. EMI coating allows for more flexible applications, as it may be spray-coated to the inside of plastic housings or the outsides of wires and regular enclosures. "Metal inks" containing copper, nickel or chromium alloys may be sprayed on to virtually any housing or material to create the effect of EMI shielding. EMI gaskets create more robust EMF protection by preventing the leakage of EMI in or out of an enclosure through seams or gaps. Gaskets are made from electrically conductive rubber materials and are often combined with EMI shielding metals. As electronic equipment advances and electromagnetic and radio frequencies become higher and stronger, EMI gaskets are used for more robust protection.

An alternative to enclosures, coatings and gaskets is the EMI filter, a passive electronic device which suppresses the electromagnetic interference generated by surrounding electronics. EMI filters are used to block electromagnetic interference which is conducted through power lines and signals (not RFI). Usually attached or integrated into the power source or switch which is to be shielded, EMI filters shunt high EMI frequencies, allowing normal low frequencies to pass; as with all types of EMI shielding, EMI filters work to both block incoming EMI and outgoing EMI. EMI filters can be an effective way to manage the EMI created on a specific power source or power line, although EMI shielding such as coating, enclosures and gaskets are still necessary to provide full protection from RFI, or electromagnetic interference conducted by radio waves.

Surface Mount Magnetic Shields
Magnetic Shields
Magnetic Shields
Surface Mount Magnetic Shields - Spira Manufacturing Corporation
Magnetic Shields - Magnetic Shield Corporation
Magnetic Shields - Magnetic Shield Corporation
Magnetic Shields
Expanded Metal Electromagnetic Shielding
MuMETAL Magnetic Shield Cans
Magnetic Shields - Magnetic Shield Corporation
Expanded Metal Electromagnetic Shielding - Dexmet Corporation
MuMETAL Magnetic Shield Cans - Magnetic Shield Corporation

EMI Shielding Types

  • Electromagnetic shielding is a barrier which protects electronic equipment from ambient electromagnetic interference.
  • EMF protection requires the use of magnetic shielding materials or products to absorb or redirect electromagnetic fields (EMF) from interfering with sensitive devices as well as contact with people.
  • EMI coating is sprayed on the interior of electronic device housings in order to protect sensitive electronic equipment from electromagnetic interference.
  • EMI enclosures or "faraday cages", protect sensitive electronic equipment from electromagnetic interference.
  • EMI filters are passive electronic devices which block conducted electromagnetic interference generated by surrounding electronics.
  • EMI gaskets create more robust EMI and RFI protection by preventing the leakage of EMI in or out of an enclosure through seams or gaps.
  • EMI shields are materials or products used to redirect or absorb electromagnetic interference in order to protect sensitive electrical devices.
  • Magnetic shielding also called electromagnetic (EMI) shielding, is the process of protecting electronic equipment from ambient electromagnetic interference.
  • Magnetic shields are materials or products that protect electronic devices from interference from magnetic fields or electromagnetic fields (EMF).
  • Mu Metal® is a nickel-iron alloy that is used to protect sensitive devices from magnetic fields that would cause magnetic interference.
  • RF absorbers also referred to as radar absorbers or microwave absorbers, protect equipment from radio frequency interference (RFI) by absorbing the magnetic energy before it can reach the equipment.
  • RFI shielding is the protection of equipment from radiated electromagnetic "noise" which travels through the air as radio waves.

EMI Shielding Terms

Anechoic Chamber - A room in which no acoustical reflections or echoes exist. The floor, walls and ceilings of these rooms are lined with a metallic substance to prevent the passage of electromagnetic waves.
Attenuation - An electrical signal's reduction in concentration as the signal passes through media. Attenuation is measured in decibels.
Canted Coil - A round-wire spring with inclining (canted) elliptical coils that, when compressed, deflect independently. Whenever any part of the coil is deflected, the whole spring responds, allowing consistent loading at each point of contact.
CE Marking - A mandatory mark for about 70% of the products sold on the European Free Trade Association (EFTA) and European Union (EU) markets. CE Marking is sometimes called "CE Mark" and referred to as the "Trade Passport to Europe " for non-EU products.
Double Shielded Enclosure - A shielded enclosure containing inner and outer walls isolated from one another, except at the point of filter penetration
Electromagnetic Compatibility (EMC) - The ability of electronic equipment to be operated without EMI.

Electrostatic Discharge (ESD) - The release of electrical energy usually caused by the shift of electrons from one object to another as the objects come into contact with and separate from one another. ESD is also known as triboelectric charge.

ESD Shielding - Shielding that prevents the failure of electronic equipment from interference associated with electrostatic discharge.

Emission - The release from electronic equipment of electromagnetic waves that have the potential to create EMI.
Filtering - The removal of certain unwanted signal components through attenuation while allowing the passage of the remaining signal components.
Impedance - The complete opposition offered by a circuit to the flow of current at a certain frequency that is a combination of resistance (R) and reactance (X). Impedance is measured in ohms; the quality of the conductor is better the lower the ohmic value.
Insertion Loss - Measurement reflecting filtering ability. Insertion loss represents the difference in power reception prior to and after the use of a filter.
Radiation - The movement of electromagnetic energy in the form of particles, rays or waves.
Radio Frequency - Low frequencies of electromagnetic radiation used for communications.
RFI (Radio Frequency Interference) - Interference in a specific frequency range used for radio communication. Unlike EMI, RFI is not conducted through circuits or power lines, but through "free" air space as radio waves. EMI and RFI are often used interchangeably; the term EMI/RFI shielding covers all interference caused by electromagnetic radiation.
Shielding Effectiveness - The ability of a shield component to prevent the passage of electromagnetic radiation. Shielding effectiveness is expressed as a ratio of electromagnetic signals with and without the shield component.
Skin Effect - The propensity of high frequency current to travel close to the outside of an electric conductor rather than through its cross section. At high frequencies, the effective resistance of a wire is increased by skin effect.
Slot Antenna - A radiating element that is created by a slot in the conducting surface or in a waveguide's wall.
Vacuum Deposition
- In a vacuum, the condensation of thin material coatings on cool surfaces.
Waveguide - Media that controls the passage of electromagnetic energy and signals.

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