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Posted by Sealing & Shielding Team on 2 Nov 2018
There are many electromagnetic interference (EMI) shielding elastomer gasket mounting techniques that offer designers reliable, cost-effective choices in both materials and component assembly. These options offer aesthetic choices and accommodate packaging requirements such as tight spaces, weight limits, housing materials and assembly costs. Most EMI shielding elastomer gaskets attach using easily repairable systems. Take a look at the list we've compiled of the seven most common elastomer EMI shielding gasket mounting systems below.
This quick, efficient attachment strip offers superior flexibility in attaching molded elastomer sheets, cut parts, and extruded conductive elastomers. But beware, Parker Chomerics does not generally recommend the addition/use of pressure sensitive adhesive.
Friction fit in a grove prevents the over-deflection of the gasket. A retaining groove will be required to be designed into the application, and this mounting choice is ideal for molded and extruded conductive elastomers.
Adhesive compounds are ideal for spot bonding non-conductive or conductive adhesive and are ideal for all conductive elastomer materials. It is important to select an adhesive suitable to adhere to either silicone or fluorosilicone, regardless of whether it is a non-conductive or conductive adhesive.
Form-in-place (FIP) automated technology such as Parker Chomerics CHOFORM® applies high-quality conductive elastomer gaskets to metal or plastic housings with robotic precision. FIP is widely used in compartmentalized enclosures and other tightly packaged electronic devices in military, telecom, transportation, aerospace, and life science applications.
Friction fit on tangs requires special design consideration, but it does accommodate thin walls and intricate shapes.
Spacer gaskets are fully customized, integral spacers made from either conductive elastomer or plastic, and provide economical EMI shielding and grounding in small enclosures. Locator pins ensure accurate and easy installation, manually or robotically.
Rivets or screw mounting requires integral compression stops and mounting holes on the flange.
For more information, visit Parker Chomerics Division or contact us directly.
This blog was contributed by Jarrod Cohen, marketing communications manager, Parker Chomerics Division.
New Essential Handbook for EMI Shielding Applications
Top Three Design Tips for Corrosion Resistant EMI Protection
Design Decisions Relating to EMC Shielding
Not long ago in hospitals and other critical care facilities, you were greeted with a large, ominous warning sign the moment you walked through the entrance doors to refrain from cell phone use due to possible medical equipment malfunction or interruption.
Today, patients and visitors are free to use mobile phones and devices without fear of interfering with medical equipment, but there’s still a long way to go to reduce electromagnetic emissions and electromagnetic compatibility (EMI/EMC) issues in medical devices.
Medical devices require complex analysis of the EMI/EMC regulations used for medical equipment and system certification. There are many new aspects that need to be addressed since medical devices are no longer used in just a hospital setting. With the increase of wearable medical tech, patients can theoretically be anywhere in the world. Therefore, EMI/EMC compliance testing needs to address the location of “end use” such as in the home healthcare environment and transportation considerations – trains, planes and automobiles.
The primary EMI/EMC standard for medical electrical equipment and systems is IEC 60601-1-2. Developed by the International Electrotechnical Commission, this global standard applies to the basic safety and essential performance of medical equipment and systems in the presence of electromagnetic disturbances, and to electromagnetic disturbances emitted by equipment and systems.
It also recognizes that RF wireless radio communications equipment (mobile phones, Wi-Fi and biotelemetry) can no longer be prohibited from the patient environment and medical equipment and systems.
However, the standard falls short of defining EMI/EMC test requirements for special environments and points to manufacturers addressing special environments in the risk assessment.
Remember, the difference between emissions and immunity tests are that the emissions requirement is concerned with the amount of electromagnetic energy emitted from your device, while the immunity requirement is concerned with how susceptible your device is to electromagnetic energy existing in the location of end use. This includes energy being emitted from surrounding devices.
The world of medical devices is dramatically changing how medical electrical equipment and systems are being used in various environments. Many different EMI/EMC standards need to be considered to address all environments of intended use.
Parker Chomerics Test Services, in association with Parker Chomerics Applications Engineering can assist in determining what standards should be applied to your medical electrical equipment and systems and help ensure compliance to the requirements. Our extensive experience in solving EMI/EMC test failures will result in manufacturable solutions which will reduce your time to market.
The Year in Review: Our Top 5 EMI Shielding Blog Posts of 2018
Calling All Puzzle Experts: Why Package Level EMI Shielding Makes Sense
EMI Shielding Caulk Delivers Superior Performance in Military Radar Systems
You are working on a new design and want to incorporate the sealing system directly – in 3D including a design space proposal? In Parker Prädifa´s CAD library, 3D step files are available for you to download.
CAD models as 3D Step files for numerous standard products are available on our product pages at www.parker.com/praedifa (or via the “CAD Library” quick link).
This makes it possible for design engineers to import Parker Prädifa seals and the matching design spaces as models directly into CAD designs for a full representation of the system. The CAD bill of materials then automatically includes the seal’s part number. This creates greater transparency and allows the parts to be traced in the system.
As a special benefit the sketch of the design space proposed by Parker Prädifa for the selected profile already exists in the model. This precludes the risk of mistakes in dimensioning the design space and further facilitates the concept design of the total system for the design engineer.
This blog was contributed by Michael Pavlou, market unit manager fluidpower, Engineered Materials Group Europe, Prädifa Technology Division
O-Ring-Werkstoffauswahl mit dem Parker O-Ring Selector
O-Ring Auswahl leicht gemacht mit dem Parker O-Ring Selector
O-Ring-Größen sicher berechnen mit dem Parker O-Ring Selector
We’re rounding up the most popular posts of the year on the Parker Chomerics EMI shielding blog in an effort to bid adieu to 2018 and give you our most useful, popular content in one spot.
Keep reading to see what made the cut!
5. Design Decisions Relating to EMC Shielding
When approaching the problem of electromagnetic compatibility (EMC), design engineers often consider it to be a secondary issue that can be dealt with once the device is working and, after all, it can be dealt with by putting a metal box around it! But that places mechanical engineers in a tough position as they deal with constraints such as weight, cost, performance and corrosion. Discover our best design tips to help with EMI shielding DURING the design stage! Read now.
4. Best Conductive Plastics: Five Things to Look For
Can electrically conductive plastics really replace traditional metal electronics enclosures? The answer is a resounding yes! There are very effective electrically conductive plastics available today that provide excellent electromechanical properties that help shield portable electronics from the electromagnetic interference (EMI) noise that is proliferating our daily life.
Smart phones, Bluetooth, Wi-Fi, radio, even your television are all susceptible to EMI. Discover the key points you may want to consider when evaluating electrically conductive plastics for your application. Read now.
3. The Difference Between Thermal Conductivity and Thermal Impedance
While not technically a blog about EMI shielding, thermal interface materials and EMI shielding generally go hand in hand. Thermal Interface Materials (TIMs) are useful for thermal management in electronic components, as they enhance heat transfer from a heat-generating component to a heat dissipater, or heat sink.
Across the industry, manufacturers often publish thermal conductivity in units of Watts / meter-Kelvin as well as thermal impedance in units of °C – inches2 / Watt on their datasheets. So, what is the difference between these two, and how should you consider them when selecting a TIM? Read on to find out!
2. Five Ways to Maximize Performance of Electric Vehicle Batteries
Electric vehicles are developing fast in line with growing demand. However, only by selecting proven, reliable, high-quality products for the effective thermal management and EMI shielding of batteries, is it possible to maximize performance.
Discover how the EV market is changing the way we think about thermal dissipation and EMI shielding for automobiles now. Read more.
1. The Art of Spraying Electrically Conductive Paints
An oldie of a post – but clearly still a goodie! Electrically conductive coatings for plastic enclosure electromagnetic shielding are growing in popularity as concerns over weight increase for a variety of EMI applications in the military, aerospace, automotive, telecom, medical, and semiconductor marketplaces. However, conductive paints cannot be applied in the same way conventional paints are. Many first attempts do not go as well as planned. Learn more about how proper preparation and practice will make you successful in your application.
Best Conductive Plastics: Five Things to Look For
Five Ways to Maximize Performance of Electric Vehicle Batteries
The Art of Spraying Electrically Conductive Paints