Magnetic shielding Paper has been invented for small shielding jobs where a high attenuation is not necessary.
A circuit breaker box (or fuse box) in the bedroom, living room, kitchen, or other living space can be a real problem. If you are handy, you can use the magnetic shielding materials listed below to make your own hinged shield. Another alternative is to mount the Giron directly on the wall and cover it with these attractive interior window shutters.
GIRON Magnetic Shielding Film, which does not contain Nickel, is unlike any other magnetic shielding material available on the market today. Suitable for small shields on magnets, motors, speakers and appliances such as refrigerators, vacuum cleaners etc. We have teamed with the design and engineering division of the Giron manufacturer to offer start-to-finish magnetic shielding solutions for residential, commercial, and industrial buildings. Enjoy the confidence of an experienced team to obtain excellent results, lowest cost, and on-time delivery.
Used for years in industry to shield delicate electronic components from EMFs, this 80% Nickel alloy magnetic shielding foil is now available at affordable prices for home and office use. Because we offer so many different matrials, of different widths, the easiest way to order rolled goods is by specifying how long the piece of material will be. The amount of shielding that you will achieve depends on many factors, including the size and shape of the shield. When using a flat shield on a wall, floor, or ceiling to shield a source of field that is close to the shield (within 8 inches), plan to cover an area that extends at least to the 2 mG line. 1- Using your gaussmeter, slide along the surface of the wall to locate the hot spot to be shielded. 2- Now slide the gaussmeter to the right, to the left, up, and down to identify how far you must shield to get to the 2 mG line.
Make sure to check for additional sources of magnetic field (lights, wiring, appliances and so on), that may be located inside adjacent walls, floor, ceiling or within the same room. Click here for a short instructional video on doing a magnetic field survery for shield design. While the special alloys in Magnetic Shielding Foil, Mag-Stop Plates, Joint Shield, and Metglas, exhibit high magnetic permeability, there are many factors which affect the amount of magnetic shielding you will achieve by using these materials.
Because we have no control over many of these factors, we cannot and do not guarantee any specific shielding performance for a specific application of these materials. 3] In general, you will extend the shield at least 2 feet beyond the size of the circuit box (or other fairly concentrated source), in all directions. 5] Also remember that you will achieve the greatest % reduction up close to the center of the shield (where the field is strongest anyway). In the end, some experimenting is often necessary to ensure proper shield thickness and placement. Joint-Shield can also be used by itself as an excellent magnetic shielding material when a 4" width and adhesive backing is desirable (wrap it around wiring and conduit, speaker magnets, even small appliances like shavers and hair dryers!).
Combining high performance nanocrystalline magnetic shielding alloy sandwiched between layers of clear PET to achieve good performance and easy handling. First line of defense for shielding strong magnetic fields from magnets, speakers, small transformers and motors. Better: One or more layers of MagnetShield (closest to the source of field), followed by one or more layers of a high permeability material such as Joint-Shield or MagStop Plate. For shielding jobs where you don’t need a high attenuation, this unique material is just the ticket.
Attention pacemaker wearers, welders and anyone wanting to shield their upper body from magnetic fields!
Made with 10mm diameter, shiny galvanized, 16g round mild steel rings which are butted closed. At last, we are proud to offer wiring which actually reduces EMF emissions to extremely low levels.
The result is a high quality wire with the lowest possible EMF emissions (over 90% reduction compared to standard wire). MµCord™ flexible “appliance cord style” for re-wiring lights and appliances, making extension cords, etc. Wow nevermind my first post I really looked like a newbie, well I still am but i read a lot since and found some really interesting data on various metals. MAGshield is easy to be attached to magnetic source, for example, electric wires or transformer, with its PSA coated on one side. MAGshiel layer can be attached inside the cable protector, so the magnetic wave radiated from electric wires can be shielded by wrapping them. The thermal pad is laminated on the MAGshiel, so the product can be thermally conductive and shield magnetic wave. The microwave absorber is laminated on the MAGshiel, so the product can absorb electric wave and shield magnetic wave. MAGshiel-F is MAGshiel coated with PET film, so it can be attached on the cover of a machine easily and the surface of any case to shield magnetic wave.
MAGshiel in the purse can protect IC card and credit card from sensor, cellular phone, card reader, magnet and etc. Why are apertures and seams so important in some applications and completely irrelevant in others?
A perfectly conducting enclosure that completely surrounds a given volume prevents anything within that volume from electrically coupling to anything outside that volume. Enclosures that are not perfectly conducting are still good Faraday cages as long as the charges can redistribute themselves fast enough to cancel the internal fields. Key concepts for practical electric field shielding are choosing a location that will intercept the stronger field lines and choosing a suitably conductive shield material. For static electric fields, almost any material will look like a conductor, since the free charge can slowly reposition itself. Intercepting electric field lines with a conductive shield is primarily a matter of visualizing the field lines that are potentially responsible for the unwanted coupling and positioning the shield so that it blocks these fields.
Because there are no free magnetic charges, it is not possible to terminate lines of magnetic flux on a shield. Currents induced in a conducting material by a time-varying magnetic field in this manner are called eddy currents.
In order to divert a magnetic field with a conductive plate, it is important to be able to develop sustained eddy currents. Note that it is important for the magnetic material shield to divert the magnetic flux all the way around the object being shielded.
At high frequencies it is possible for the currents induced on the shield to radiate as well as (or possibly much better than) the original source of the fields.
An ideal shielded enclosure with infinite conductivity and no breaks would perfectly isolate (electromagnetically) whatever was inside the enclosure from whatever was outside. Unfortunately, such an enclosure would not be very practical for electronic devices since it would be impossible to interact electrically with whatever was inside.
Apertures are holes in a shielded enclosure such as those required for ventilation, optical displays, plastic components, or mechanical supports. Generally, the amount of energy escaping an enclosure through small apertures is insignificant compared to the energy escaping through seams, larger openings and wire penetrations. A seam that optically appears to be well sealed can often disrupt the flow of surface currents significantly causing a major breach in the shielding enclosure. In order for the shield on a shielded wire to be effective, it must make a low-inductance connection to the shielded enclosure.
Sometimes it is necessary to have a large number of apertures in a shield for the purposes of ventilation. For a rectangular waveguide with height b, width a and length d, the mode of propagation with the lowest cut-off frequency is the TE10 mode. At frequencies where the term under the radical is negative, the propagation constant is imaginary and fields do not propagate. Note that derivations based on both rectangular and circular waveguides have a constant in front that is within 3 dB of 30. This model does not account for how the field was set up at one end of the opening or how efficiently it is radiated from the other end.


Note that if a wire or second conductor of any kind penetrates the opening, the lowest-order mode of propagation is the TEM mode. Some textbooks state that the attenuation in (38) should be reduced by a factor of 10*log10(# of apertures) if there are multiple apertures. The product is generally used in factories to shield delicate electronic components from EMF Pollution. The product is only 0.010 inch thick and has enough flexibility to be cut with scissors and can be shaped with hands easily. Strong magnetic field emissions (depending on how much electric current is flowing) and electric field emissions can make the nearby area hazardous to occupy, especially for long periods. Suitable for high field strength applications requiring high saturation and good permeability, it is both thin and strong, and unlike Mu-metal™ it is very tolerant to bending or shaping without losing its shielding properties. Cuts neatly with snips or sheet metal tools, and can be used either flat or molded into shapes for best performance.
The 30" wide "fully hydrogen annealed" plates offer the best shielding available (up to 10 times the shielding effectiveness of stress-annealed alloy) and should not be soldered, welded, or heated in any way. The list of such factors includes: size and shape of the source of the magnetic field, size and shape of the shielded area, seams in the shielding material, frequency of the magnetic field, distance from shield to source, orientation of shield to the source, thickness and heat treatment of shielding material, etc. Also, note that foils, ribbons and plates, once cut by us to your specifications, are not refundable. Remember to make measurements under various conditions, as the readings will change according to how much electric current is flowing at the time of the reading. This will influence the choice for thickness of the Mag-Stop Plate shield, or the number of layers used. In other words, the field will be stronger at the edge of the shield as compared to having no shield at all. This occurs when the Earth's magnetic field (about 400 mG) interacts with a large shield, reducing its effectiveness, unless special "high saturation" (MagnetShield) shielding alloys are incorporated into the design. Joint-Shield can be shaped by hand, without the need for special tools, but watch the sharp edges. Very light weight and flexible, easily trimmed with scissors this material will provide good high frequency magnetic shielding for moderate to low intensity fields below 1000 kHz. Strong magnetic fields are harder to shield because they tend to "saturate" the shielding material. If you want to shield 2 adjacent magnets from eachother, each magnet should have its own shield.
Only 0.010 inch thick, PaperSHIELD is flexible and can be easily cut with a scissors and shaped by hand into simple or very complex shapes.
Replacing existing wire with MµCord is likely to be much less costly, more effective, and probably more convenient than shielding.
Simply cut wire to desired length and add a plug to one end, or plug one end and socket on the other. You have everything you need already!Take a look at this diagram and someone make one please. The answer relates to the fact that there are different kinds of shielding for different applications. Most metallic enclosures without significant seams or apertures provide excellent electric field shielding over a wide range of frequencies.
1(a) field lines may terminate on other conductors resulting in potential differences between these conductors as indicated in Fig. However for high-frequency electric fields, the conductivity of the shield material must be high enough to allow the charge to move quickly back and forth. 3(a) illustrates a guard trace being used to reduce the coupling between two parallel traces on a printed circuit board.
However any electric field on the surface of a good conductor will cause currents to flow in that conductor. Both the incident field and the magnetic field created by the eddy currents are shown in Fig. Since the eddy currents are driven by time-varying fields, a conductive plate cannot divert a static magnetic field.
Since these materials have a reluctance much less than air, magnetic field lines can effectively be rerouted by providing an alternative path through a permeable material such as steel or mu-metal. A plate of magnetic material above or below the circuit board would provide no shielding at all. This is possible whenever the maximum dimension of the shield is a significant fraction of a wavelength or larger.
So the best we can do is to start with a perfect enclosure and carefully evaluate every seam, every aperture and every cable penetration to ensure that no significant interfering signals are allowed to pass from one side to the other. In order for the enclosure to provide shielding, currents must be able to flow on the surface unimpeded. However if the enclosure is well sealed and it is necessary to further reduce the energy escaping through the apertures, then apertures with sufficient depth can be provided to further attenuate the radiated emissions. Seams are often a more significant source of leakage than apertures because of their greater length. A single unshielded, unfiltered wire penetrating a shielded enclosure can completely eliminate any shielding benefit that the enclosure otherwise provided.
This is generally accomplished by using a shielded connector that makes a 360-degree metal-to-metal contact with both the cable shield and the enclosure, as illustrated in Fig. Filtering will minimize the voltage between the wire and enclosure at radiation frequencies, while allowing low-frequency signals or power to pass unattenuated. In large enclosures with very stringent shielding and thermal requirements, it may be necessary to further reduce the amount of energy that can escape through any given aperture. The cut-off frequency is approximately the frequency at which the maximum height or width, a, is equal to a half-wavelength.
Other modes of propagation yield different constants, but the lower-order modes dominate so it is reasonable to use a value of 30. However, even thin apertures will provide some attenuation if their cross sections are small relative to a wavelength. Therefore, by itself, it cannot be used to determine the shielding effectiveness of any particular shield. Fields at any frequency can penetrate the opening in the TEM mode, so there is no benefit to using a thick aperture if a wire penetrates the aperture. However, the attenuation in Equation (38) is in addition to any attenuation provided by a thin aperture or an array of thin apertures. It is an 80% nickel alloy and it is 0.004” thick and this is why it can be easily trimmed with scissors and can be shaped with hands. High saturation and moderate permeability make this product an ideal one for shielding weak magnets and in case of stronger magnets many layers of shielding should be done. Shielding is certainly possible, but the shield must not hamper quick and easy access to the controls inside the box.
It’s a picture (or poster) in a nice frame, with high performance Giron shielding material behind the picture.
We'll help you find the right solution, saving time, money, and creating satisfied customers! Now you can simply replace your Switch Plate or Outlet Cover with these custom shielded ones. So, for example, if you order 22 linear feet of a material, you will get a piece that is 22 feet long x the width of the material. Hydrogen annealed plates have 2 small holes pre-drilled near one end which may be used for mounting. Also, find out if there are other sources, such as wiring leading to the circuit box, nearby fluorescent lights, etc.
Most would recommend that you achieve readings of 2.5 mG or less in areas where people will be spending a lot of time.
This is a generous .010" thick, fully hydrogen annealed magnetic shielding alloy with adhesive backing (rated 0 - 200°F) on one side.
This 4" wide foil is a hefty .010" thick and has an exceptionally high magnetic saturation of 21400 Gauss and maximum permeability of 4000. High saturation and moderate permeability make this ideal for shielding weak magnets, or stronger magnets with many layers of shielding.


Composed of individual metal links which give good flexibility and plenty of air circulation. For example, if you don’t need the head covering, you could move those links to achieve more shoulder or heart coverage. Check out these great prices on slightly used or just opened once only items.I always buy my gadgets via these great Warehouse deals ! Check out these great prices on slightly used or just opened once only items.I always buy my gadgets via these great Warehouse deals ! But in addition, because of the Cobalt alloy top coating, this material offers remarkable radio frequency magnetic shielding in difficult near field conditions. On the other hand, it is not uncommon to find shields that don’t surround the entire product. It is convenient to divide enclosure or component shields into 3 categories: electric-field shields, magnetic-field shields and shielded enclosures. Electric fields generated within the volume either terminate on objects within the enclosure or on the inner surface of the enclosure wall as illustrated in Fig. A vertical magnetic field from an electric motor couples to a small circuit board resulting in interference. Even if the field is slowly varying, losses in the conducting plate will cause the eddy currents to dissipate allowing the magnetic flux to penetrate the plate. At these frequencies, it is generally necessary to enclose the source completely while paying close attention to any apertures, seams or cable penetrations that could allow electromagnetic energy to escape. Fortunately, apertures with maximum dimensions that are much smaller than a wavelength provide very little impedance to the flow of currents on a conducting surface.
A seam that is on the order of a half-wavelength long can be a very efficient radiation source, much like a resonant half-wave dipole. As a result, any current flowing in the shield will produce a voltage drop across the pigtail that drives the cable shield relative to the enclosure, causing radiated emissions. It is usually necessary to locate the filter as close to the connector location as possible in order to minimize the inductance of the connections and to prevent the possibility of noise coupling to the filtered wire before it exits the enclosure. This can be accomplished by increasing the depth of the aperture so that it resembles a small waveguide.
The attenuation calculated in (38) should be added to the shielding effectiveness that would be obtained from the same aperture configuration in a thin shield. Equation (38) cannot be used to calculate the shielding effectiveness directly; and there is no reason to reduce the Equation (38) value for multiple thick apertures if you are starting from the attenuation provided by multiple thin apertures. It is used to form magnetic barriers on cellular phones, microwave ovens, doorbell transformers and more. Magnetic field reduction is 30 to 60% up close to the surface, depending on wire configuration.
Can be formed into magnetic barriers on cellular phones, microwave ovens, doorbell transformers, VDTs, buried wiring, and more. Just right when you need to cut magnetic shielding materials including Giron, MagnetShield , and Magnetic Shielding Foil.
Simply butt the Mag-Stop plates tightly together, and "tape" over the seam with Joint-Shield high permeabilty alloy. Tin plated for excellent corrosion resistance and better conductivity, it can be soldered or painted. This material is particularly suited for achieving precise levels of partial shielding as you can add exactly the right number of layers to achieve the desired result. The best shielding strategy in any given application depends on a number of factors including the electrical characteristics of the circuit or system being shielded, physical constraints (e.g.
As long as charges are able to move freely enough to reorient themselves as fast as the field changes, cancellation of the external fields will be achieved.
3(b) shows how grounding a heatsink attenuates the electric field between the heatsink and a printed circuit board ground plane.
In a perfect conductor, the flux generated by these currents would perfectly cancel the incident flux causing both sides of (37) to equal zero (i.e.
For this reason, conductive materials are generally poor magnetic shields at low frequencies (e.g. 5 illustrates how a shield made from a permeable material can be used to protect the circuit in the previous example.
For apertures with a small cross-section, the frequencies of the sources within the enclosure are likely to be well below the cut-off frequency of the waveguide. It is possible to make inefficient antennas (such as an electrically small wire or loop antenna) radiate much more efficiently by enclosing them in a metal enclosure with a resonant slot or seam. At frequencies where the cross-sectional dimensions of the aperture are small relative to a half-wavelength, energy propagating through the aperture will be attenuated in the same manner that energy propagating through a waveguide below the cut-off frequency is attenuated. It works best against the weak and moderate levels of magnetic fields in mili gauss levels. With snug fitting shapes, get as much as 75% attenuation of the magnetic field with one thickness. This method offers much less bulk and better appearance than the old overlap technique and provides excellent shielding integrity. These shields may be penetrated by unfiltered wires and sometimes consist of a single plate of metal that may or may not be connected to ground. Free charge on the enclosure relocates itself as needed to exactly cancel the fields within or external to the enclosure. Information on designing apertures to be waveguides below cut-off is provided in a later section. Surface oxidation, corrosion and warping on the metal plates reduce the quality of the electrical contact. In our tests, a 2-foot section of Giron in a 24x36 inch frame provided 50-70% reduction of magnetic field.
Works with AC or DC magnetic fields (0-1000 Hz), and will tolerate temperatures from 32° to 140°F.
Simple to use: just cut to desired length with a heavy scissors, peel the protective backing and press into place!
Peel and stick adhesive on the other side permits easy and semi-permanent mounting almost anywhere. And don't forget to tell us, lolAnd just thinking about it your right about the attraction, But can't we used it at our advantage ?
2(b)] can substantially reduce these potentials by altering the path of the electric field lines and preventing the stronger field lines from reaching the victim circuit.
3(c) demonstrates how the orientation of a daughter card affects the coupling of power bus noise to components on a mother board. Note that the eddy currents cause the magnetic flux to be diverted around the plate and significantly reduce the coupling to the circuit. Conductive magnetic shields are also ineffective if they have slots or gaps that interrupt the flow of the eddy currents. If you need a shield larger than what is suggested here, just contact us, we will be happy to assist you. Laminated with a 0.005 inch glass reinforced polypropylene tape which is UV sensitive, cover if installation is exposed to direct sunlight.
Note that field lines terminating on a conductor imply there is a negative charge induced at that point. 7(c)] can provide a good electrical contact at points, but they do not necessarily improve the connection at locations between fasteners. Note that a shielding enclosure can be very effective even when it has a significant amount of open area as long as each individual aperture is much smaller than a wavelength.
One technique for reducing the impedance of seams is to overlap both sides of the plates as illustrated in Fig. If the field is time varying, there will be a current on the surface of the conductor as these charges move back and forth. Make sure you have enough room between outlet and nearby moldings for these larger than standard covers.



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