Magnetic shielding, also called electromagnetic (EMI) shielding, is the process of protecting electronic equipment from ambient electromagnetic interference that can cause electronic components to malfunction. Electromagnetic interference is the magnetic field which is created by electrical currents and can be caused either intentionally or unintentionally, which is far more common.
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Spira Manufacturing CorporationNorth Hollywood, CA 818-764-8222 Spira Manufacturing Corporation offers the most reliable magnetic shielding for the electrical and electronic industries to meet required regulations. We have been providing reliable, cost-effective solutions for over thirty years, and to this day we continue to provide products with innovation and expertise. Spira Manufacturing is an AS9100 and ISO 9001:2008 certified company.
Compac Development CorporationBay Shore, NY 888-546-3313 Established in 1976 as versatile magnetic 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.
Magnetic Shield CorporationBensenville, IL 888-766-7800 The "Preferred Source" since 1941 for magnetic shielding. ISO 9001:2008 certified, Magnetic Shield Corporation has served customers world-wide with unique product solutions for over sixty-nine years. We work with engineers, designers and scientists to provide custom fabrications and our specialty alloy materials including: MUMETAL®, CO-NETIC® and NETIC®.
INTERMARK (USA), Inc.San Jose, CA 408-971-2055 INTERMARK (USA) Inc. focuses on research and development for constant magnetic shielding improvement as one of the industry`s leading product companies. In touch with the evolving market, INTERMARK supplies the best-fitting parts for current applications and standards. Specializing in efficient and quality products, INTERMARK is devoted to providing superb customer support.
Sealing Devices Inc.Lancaster, NY 716-684-7600 Sealing Devices is a leading North American distributor and fabricator of magnetic 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.
Equipto Electronics CorporationAurora, IL 800-204-7225 This premier electronics packaging provider offers heavy duty racks, FCC racks, EMI/RFI shielded racks, seismic shielded racks, electronics desks, instrument cabinets, card cages, sub-racks & relay racks. If your magnetic shielding requirements involve heavy duty EMI shielded cabinets, Equipto's superior line of shielded enclosures fits a wide variety of EMI/RFI suppression applications.
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Magnetic Shielding
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 interruption and interference of electrical flow in sensitive electronics devices such as mobile phones, laptops, computers, monitors and many others. However, most problematic EMI comes from electromagnetic cross-talk between different components on the same board as EMI travels across wires and conductive materials. Magnetic interference can be blocked through two main methods: physical objects such as EMI enclosures or un-apparent objects such as EMI coating or transmitted signals. Of the two types of magnetic shielding products, physical objects are more commonly used as magnetic shielding and RFI shielding to guard sensitive electronic equipment; magnetic shielding is essential in many industries dependent upon electronic equipment, such as sound, lighting, industrial, medical, defense and telecommunications industries.The most common methods of magnetic shielding protection are through the various are EMI enclosures, EMI coatings, EMI gaskets and EMI filters. EMI enclosures, or "faraday cages" provide magnetic shielding for electronic equipment by absorbing harmful magnetic signals and radio waves. EMI enclosures are generally constructed from aluminum, stainless steel, nickel or copper alloys. 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 EMI and RFI 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. An alternative to enclosures, coatings and gaskets is the EMI filter, a passive electronic device which blocks high EMI frequencies, allowing normal low frequencies to pass. EMI filters are used to block electromagnetic interference which is conducted through power lines and signals, and do not provide magnetic shielding for air-transmitted magnetic radio frequency interference.
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Images Provided by INTERMARK (USA), INC.
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