A circuit breaker box (or fuse box) in the bedroom, living room, kitchen, or other living space can be a real problem. 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. Shielding is certainly possible, but the shield must not hamper quick and easy access to the controls inside the box.
If you are handy, you can use the magnetic shielding materials listed below to make your own hinged shield. If you want an easier solution, here it is. It’s a picture (or poster) in a nice frame, with high performance Giron shielding material behind the picture. Just put a nail above the breaker box and hang the shielded picture where you need it. The bigger the shield, the better the shielding. In our tests, a 2-foot section of Giron in a 24x36 inch frame provided 50-70% reduction of magnetic field. If you need a shield larger than what is suggested here, just contact us, we will be happy to assist you.
Obviously, these are just examples. Get something you like.
Get a nice picture to put in the frame. Here is a nice one, but you can use any that you like.
Put the picture in the frame. Insert cardboard behind the picture. Insert Giron behind the cardboard (careful as you handle it, the edges are sharp!). Use duct tape to hold the Giron in place if needed. Position the Giron so it will be centered over the magnetic “hotspot” on the wall. If you have room, insert another layer of cardboard behind the Giron. Now hang your Picture! Final product weighs about 9 pounds, depending on the frame you select.
SHIELDED SWITCH PLATES AND OUTLET COVERS
Reduce Emissions at the Source
Outlets and switches can emit strong electric and magnetic fields. Conventional shielding with mumetal is possible, but tricky because it’s hard to make it look good, plus you need access to be able to use the switch/outlet. Now you can simply replace your Switch Plate or Outlet Cover with these custom shielded ones. Magnetic field reduction is 30 to 60% up close to the surface, depending on wire configuration. Electric field reduction is typically 75%. Attractive polished chrome finish with a nice perimeter detail. Solid metal (shielding alloy) and durable. Includes mounting screw(s). Two sizes: oversize (3˝x5˝”) and super jumbo (5˝x7˝”) for maximum protection. Make sure you have enough room between outlet and nearby moldings for these larger than standard covers. Very economical!
Super Jumbo (Cat. #A723) ........................ $29.95 each Super Jumbo, 10 pack (Cat. #A723-10) ........ $250.00
Breakthrough In Magnetic Shielding Flexibility
GIRON Magnetic Shielding Film, which does not contain Nickel, is unlike any other magnetic shielding material available on the market today. 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.
GIRON is a woven, laminated material. Cuts neatly with snips or sheet metal tools, and can be used either flat or molded into shapes for best performance.
Suitable for small shields on magnets, motors, speakers and appliances such as refrigerators, vacuum cleaners etc. Also great for lining car floor or firewall. Perfect for full or partial wall / floor shielding in rooms too! Can be glued, taped, nailed, screwed or riveted into place. Could even be used to make a (heavy weight) vest to shield a person's torso! Works with AC or DC magnetic fields (0-1000 Hz), and will tolerate temperatures from 32° to 122°F. Laminated with a 0.005 inch glass reinforced polypropylene tape which is UV sensitive, cover if installation is exposed to direct sunlight.
Initial permeability: 500
Relative permeability: 7000
Saturation induction: 2,0 T
Curie Temp.: 740°C (1364°F)
Weight is approx 1 lb per square foot
25.5 inch wide, 1 mm thick. Weighs 3.5 Kg/m˛ (about 15 pounds per 10 foot length). Edges are sharp!
GIRON (Cat. #A273) ............................... $44.95 per linear foot GIRON full roll (81 feet) (Cat. #A273-roll) ... $2912.76 per roll (Save 20%)
Need a Turn-Key Magnetic Shield Solution?
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.
We can work with you to...
- clarify the baseline information needed
- design and quote the shielding job
- install, test and certify the finished shield
Enjoy the confidence of an experienced team to obtain excellent results, lowest cost, and on-time delivery. Whether you need one room shielded, a whole floor, or complete building, we can help.
We can also design and fabricate custom Giron shields for smaller production pieces. If you are a manufacturer, and need shielding built into your product, call us. We'll help you find the right solution, saving time, money, and creating satisfied customers!
Giron Design & Installation Process:
Example of retrofit Giron Shielding inside a historic building:
MAGNETIC SHIELDING FOIL
"The Best Material Available for Shielding DC, ELF & VLF Magnetic Fields"
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. The thinner (0.004" thick) material is easy to trim with scissors and shape by hand. Thicker material offers better shielding performance but requires snips to cut. Can be formed into magnetic barriers on cellular phones, microwave ovens, doorbell transformers, VDTs, buried wiring, and more. With snug fitting shapes, get as much as 75% attenuation of the magnetic field with one thickness. Use multiple layers for even greater reduction. Foil is available in two thicknesses and can be ordered in any length. (We recommend the use of a gaussmeter to determine the proper shape and positioning of the magnetic shield, and to confirm that the fields have been adequately reduced.) 15 inches wideCAUTION: Foil has sharp edges!
Magnetic Shielding Foil: 15" wide, 0.004" thick (Cat. # A276-15) ..... $24.95/linear ft
Magnetic Shielding Foil: 15" wide, 0.010" thick (Cat. # A276-10) ..... $31.95/linear ft
"Great for Cutting Magnetic Shielding Materials"
10 inch long and heavy duty. Drop forged carbon steel, straight cutting. Double dipped soft comfort grip. Just right when you need to cut magnetic shielding materials including Giron, MagnetShield , and Magnetic Shielding Foil.
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. We describe the length of the material purchased in linear feet. 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. The width of each material is listed near the end of the product description.
Flat surface magnetic shielding for large or small areas
Now achieve excellent and affordable magnetic shielding in difficult situations! Mag-
Stop Plates are extra thick high-efficiency magnetic alloy (Mumetal®) plates, specially designed to
provide superior shielding for electric circuit boxes, side by side computer users, and any
situation where you need a flat shielding material on a wall, floor, or ceiling. Can be
mounted with ordinary nails or screws, or sandwiched between the studs and dry-wall.
Use zinc chromate primer before painting. In one application, we were able to achieve almost 95% attenuation of a
200 mG field!
The 24" wide "stress annealed" plates offer good magnetic shielding and are also well-suited
for forming into complicated shapes. 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. Hydrogen annealed plates have 2 small holes pre-drilled near one end which may be used for mounting.
Because of size and weight, additional shipping charges apply.
Application Note for Joining Plates:
There are two effective ways to achieve shielding continuity between multiple plates:
1] overlap 2" at the joints, ensuring good metal-to-metal contact
2] butt joints tightly and cover over the joints with Joint Shield (see diagram at right)
We can pre-cut plates into 2 or more pieces for you.
Note that these plates are 10 feet long and ship by truck. Online shipping estimator will not be correct. Contact us if you have questions about ship costs.
See "Foil" at top of this page for Specs for Stress Annealed Plates
Application Note: How Much Area Do I need to Cover?
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.
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. 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.
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. Also, note that foils, ribbons and plates, once cut by us to your specifications, are not refundable.
Here are some basic guidelines for shield design on a circuit box to get you started:
1] Naturally, you must first make measurements of the magnetic fields, which are present. 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. Also, find out if there are other sources, such as wiring leading to the circuit box, nearby fluorescent lights, etc.
2] Determine how much attenuation (reduction) you want. This will influence the choice for thickness of the Mag-Stop Plate shield, or the number of layers used. Most would recommend that you achieve readings of 2.5 mG or less in areas where people will be spending a lot of time.
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. The distance from the shield to the box will be a factor.
4] Remember that you will end up concentrating the field at the edges of the shield. In other words, the field will be stronger at the edge of the shield as compared to having no shield at all. So think about positioning the edges away from where the people are likely to be.
5] Also remember that you will achieve the greatest % reduction up close to the center of the shield (where the field is strongest anyway). As you back away from the shield, the % reduction decreases.
6] Finally, for large shields, one must take saturation into account. 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.
In the end, some experimenting is often necessary to ensure proper shield thickness and placement.
If you are still not sure how to use these materials, you may call us for suggestions or we may even be able to locate the name of an experienced shielding designer/installer in your area who can assist in designing your shield.
Another format of MuMetal®, great for Magnetic Shield Prototyping and for Joining Mag-Stop Plates
When you need more than one Mag-Stop Plate to cover an area, how do you handle the joints? Joint-Shield is the perfect solution! This is a generous .010" thick, fully hydrogen annealed magnetic shielding alloy with adhesive backing (rated 0 - 200°F) on one side. Simply butt the Mag-Stop plates tightly together, and "tape" over the seam with Joint-Shield high permeabilty alloy. This method offers much less bulk and better appearance than the old overlap technique and provides excellent shielding integrity. Simple to use: just cut to desired length with a heavy scissors, peel the protective backing and press into place!
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!). Joint-Shield can be shaped by hand, without the need for special tools, but watch the sharp edges.
4 inch wide. Specify desired length when ordering. Joint Shield (Cat. #A277) .................................. $39.95/linear foot Joint Shield [100 ft roll] (Cat. #A277-roll) ...................... $3595.50
FINEMET® Wide Format Film
Ultra-Light Weight, Wide Format, Flexible Magnetic Shielding
Combining high performance nanocrystalline magnetic shielding alloy sandwiched between layers of clear PET to achieve good performance and easy handling. 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. Tolerates bending very well.
Stack multiple layers to improve shielding performance. Maximum permeability: 70,000. Maximum flux density: 1.13T.
Only 0.12 mm thick (5 mil) and 470 mm (18.5”) wide. 0.052 lb/ft˛. Hitachi Part #MS-FR 470-100M-T0
Specify desired length when ordering. May have splices.
FINEMET (Cat. #A271) ...................... $22.28 per lin foot
FINEMET Full Roll (100 meters) (Cat. #A271-roll) … $5430.00 (about $16.70 per foot)
High Saturation Magnetic Alloy
First line of defense for shielding strong magnetic fields from magnets, speakers, small transformers and motors. Strong magnetic fields are harder to shield because they tend to "saturate" the shielding material. This 4" wide foil is a hefty .010" thick and has an exceptionally high magnetic saturation of 21400 Gauss and maximum permeability of 4000. Tin plated for excellent corrosion resistance and better conductivity, it can be soldered or painted.
MagnetShield typically reduces fields up to a factor of 2 or 3 depending on size/shape of the shield. Can be used in multiple layers, and/or in combination with a higher permeability alloy such as Joint-Shield for higher attenuation. Annealing is not necessary with this material.
For increased shielding effectiveness, consider the following strategies:
Good: Layer(s) MagnetShield
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.
- The magnets will be attracted to the shield (this is true of ALL magnetic shielding alloys). If you want to shield 2 adjacent magnets from eachother, each magnet should have its own shield.
- The size, shape, and position of the shield all matter in terms of shield performance. For example, larger shields are better than small shields. Closer to the magnet is better than farther from the magnet. And parallel to the magnetic field lines is better than perpendicular to them.
- You will likely need more than one layer of shielding material, depending on the strength of your magnets. More layers = more attenuation.
Our customers are telling us:
"Just wanted to thank you for your advise and product. The magnetic shield was wrapped around the windlass motor about 4 times and with a few tweeks, it totally negated any magnetic influence on the compass. I'm very pleased with the results!"
4 inch wide Ribbon: MagnetShield (Cat. #A274) ........................... $4.50/lin ft MagnetShield [250 ft roll] (Cat. #A274-roll) ..... $844.00
Also available in larger dimensions: MagnetShield Plate 36" x 15" x .015" (Cat. #A274-15) ........... $39.00
MagnetShield Plate 36" x 120" x .015" (Cat. #A274-36) ....... $259.00*
* Note that these plates are 10 feet long and ship by truck. Online shipping estimator will not be correct. Contact us if you have questions about ship costs.
Light Duty Economy Magnetic Shielding
For shielding jobs where you don’t need a high attenuation, this unique material is just the ticket. 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. High saturation and moderate permeability make this ideal for shielding weak magnets, or stronger magnets with many layers of shielding. 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. White paper on one side can be imprinted (by you). Peel and stick adhesive on the other side permits easy and semi-permanent mounting almost anywhere. Magnets will stick to it nicely. Really great for experimenting. 36 inches wide. Made in USA.
PaperSHIELD (Cat. #A270) …....................… $14.22/ lin ft PaperSHIELD 82 ft roll (Cat. #A270-roll) …..….. $875.00
UPPER BODY SHIELD
Magnetic Shielding You Can Wear!
Attention pacemaker wearers, welders and anyone wanting to shield their upper body from magnetic fields! The Upper Body Shield does exactly that. Composed of individual metal links which give good flexibility and plenty of air circulation. Provides about a measurable ~50% reduction of AC and DC magnetic field!
Made with 10mm diameter, shiny galvanized, 16g round mild steel rings which are butted closed. You can easily move/remove links. For example, if you don’t need the head covering, you could move those links to achieve more shoulder or heart coverage. Or you could use removed material to double up the shielding in desired places. Keep it dry as it will rust! You should probably wear a fabric liner under the shield, to minimize direct skin contact. It has some weight to it, just over 6 pounds. One size fits all.
Upper Body Shield (Cat. #A279) ............. $69.95
Unique Shape for Unique Shielding Applications
Do you have an application requiring Mumetal® in un-insulated wire format? We have it in two different diameters! Stress annealed Mumetal® alloy. Wind it, weave it, braid it. Create toroids, coils, chains or simply experiment with its unique properties! Be the first to create a truly magnetic shielded garment! Spool size varies between 1-2 pounds. Click here for Specs on MuMetal® Wire
.005" wire (= 36 gauge = 0.13mm diameter) yields approximately 13400 ft per pound
.025" wire (= 22 gauge = 0.64mm diameter) yields approximately 530 ft per pound
Breakthrough in Low EMF Wiring!! Exclusively from The EMF Safety SuperStore!
At last, we are proud to offer wiring which actually reduces EMF emissions to extremely low levels. Patented design incorporates both of these EMF emission suppression features:
special internal wire configuration to maximize cancellation of magnetic field emissions: 2 hot, 2 neutral, and one ground wire
and shielded wrapping to completely eliminate electric field emissions!
The result is a high quality wire with the lowest possible EMF emissions (over 90% reduction compared to standard wire). Replacing existing wire with MµCord is likely to be much less costly, more effective, and probably more convenient than shielding.
See How MµCord compares to standard ROMEX® carrying 30 Amps at 120V:
Standard ROMEX® Wire
Electric Field (V/m)
Magnetic Field (mG)
Electric Field (V/m)
Magnetic Field (mG)
7.68 (92% reduction)
0.96 (96% reduction)
0.12 (98% reduction)
0.014 (99+% reduction)
0.0019 (99+% reduction)
0.00096 (99+% reduction)
0.00012 (99+% reduction)
Includes ground wire. Note: MµCord will not compensate for unbalanced current. Make sure you correct wiring errors when you re-wire with MµCord. Not UL listed for in-the-wall wiring applications.
MµCord™ flexible “appliance cord style” for re-wiring lights and appliances, making extension cords, etc. 20AWG tinned-copper stranded wire. Rated for 8 Amps, 300 Volts. Ľ inch outer diameter. Black. Specify length in feet
MµCord (Cat. #A223) …..... $1.75 per foot
Make Your Own Shielded Extension Cord or Appliance Cord
MµCord™ can be used to make extension cords and appliance cords. Simply cut wire to desired length and add a plug to one end, or plug one end and socket on the other. Easy to do with a screwdriver, instructions included. Rated for 15A – 125V
These plugs are suitable for North America. Plugs and sockets for other countries can be used, but you must obtain them locally. Color/style may vary.
NEMA 5-15P: 3 prong grounded plug (Cat#A224P) ... $5.95 NEMA 5-15R: 3 prong grounded socket (Cat#A224R) ... $5.95
3 Outlet Socket Adapter
More Outlet Space
Need more room at the end of your cords? This sturdy adapter converts one outlet into three. Uses standard North American 3-prong outlet. Handles up to 15A safely. Color/style may vary.
3 Outlet Socket Adapter (Cat. #A804) .............. $2.95
These additional items can be purchased directly from other websites. Click links below:
Magnetic Field Warning Sign
Bold colored sign leaves no doubt about the danger present. Generous 10x14 inches.