Tel: +1-518-608-6479          Magnetic Field Shielding  
High Permeability Materials (including MuMetal®) for Magnetic Field Shielding, Blocking, Mitigation, and Protection    
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Magnetic Field Shielding

Learn how to shield magnetic fields. Download our free Guidelines For Installing Magnetic Shielding
Shielding FAQs More answers to Magnetic Shielding Questions
Sorry, no returns on cut goods. See Return Policy

Which magnetic shielding material should I use?

For strong fields
(over 1 Gauss):

high saturation, low permeability alloys
For weak or moderate fields
(milliGauss levels):

low saturation, high permeability alloys
For high frequency fields:
Giron (best performance, large format)
MagnetShield (good performance)
Shieldene® Corrosion Resistant (good performance)
PaperShield (low performance)
Speaker Magnet Shield (small magnets)
Magnetic Shielding Foil
Mag-Stop Plates (large format)
JointShield (adhesive on one side)
MuMetal Rod
Finemet (kHz range)
CobalTex (MHz range)
Still can't decide? Consider our Magnetic Shielding Alloy Sampler


SHIELDENE Corrosion Resistant Magnetic Shield Plate SHIELDENE Magnet Shielding Plate

Perfect Size for Many Projects, Indoors or Outdoors

Need to cover a large area" Worried about rusting" This material is an excellent choice for moderate magnetic shielding (permeability ~1000) when cost is the major consideration. Large 24 x 48 x 0.0293 inch format, weighs about 10 pounds per sheet, and delivers up to 80% magnetic field reduction when size and position are optimized. Magnetic Permeability of ~800. Great for covering a breaker panel, or sliding behind a solar panel inverter or smart meter. Attractive lightly brushed finish is very corrosion resistant, even at the edges. Ships with PVC film on one side to help protect against scratching during fabrication and in-stallation. Can be cut or bent with sheet metal tools, and magnets will stick to it.

SHIELDENE® Corrosion Resistant Magnetic Shield Plate (Cat. #A269) ............. $128.00 add shieldene magnetic shield to cart
For each parcel, a crate charge of $20 will be added. We can put 1-10 plates in a parcel. Ships by UPS as oversize.

Breaker Box shield Magnetic shield for Breaker Box

Circuit Breaker Shield

Decorative Magnetic Shielding

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. NOTE: This is designed for small apartment panles, around 18" x 12" or similar. You may need more material for larger panels.

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 (see this application note to determine how large your shield should be), just contact us, we will be happy to assist you.

Bookmark this page before you begin so you can find your way back.

magnet shielding for Breaker Box Here is how to create your magnetic shield:

Step one:
Purchase Giron, 25.5 inch wide x 24 inch
GIRON for Poster (Cat. #A273-24P) ............... $97.90 add magnetic blocker to cart

Step two:
Get one of the following, at least 24x36 inches:

Picture Frame
Framed Mirror
Dry Erase Board, framed
Cork Bulletin Board, Oak Frame

Obviously, these are just examples. Get something you like.

Step three:
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.

Another alternative is to mount the Giron directly on the wall and cover it with these attractive interior window shutters. Click images below for more information or to order through Amazon:


Affordable window shutters are available in many sizes. A great way to add a decorative touch over Giron shielding material for small areas.

Be sure to order the quantity of Giron that you need before you click the links above: GIRON (Cat. #A273) ............................... $48.95 per linear foot add giron magnetic field shield to cart

Our customers are telling us:

"I just wanted to tell you the terrific results I got from using the Giron on the back of a dry erase board to cover the 2 breaker boxes in my daughter's apartment. In this small narrow kitchen, ( approx. 65 sq. ft.), the readings were originally 15 - 30 mG throughout. After hanging the board, the readings were 2 mG throughout. Quite the reduction! And, in the two bathrooms that are situated behind the opposite wall from the breakers, the readings went from 5 - 15 mG, to 2 - 2.5 mG. I didn't expect this shield's effect to reach so far, considering I had limited space to work with. Thank you for your help."
N.L.; New York NY

GIRON best magnetic shield


Breakthrough In Magnetic Shielding Flexibility

GIRON Magnetic Shielding Metal 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 best magnet shielding 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 140°F. Laminated with a 0.005 inch glass reinforced polypropylene tape which is UV sensitive, cover if installation is exposed to direct sunlight.
GIRON most effective magnetic shield

  • 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
  • Thickness: 0.9 mm (0.034 inch)

25.5 inch wide, 1 mm thick. Weighs 3.5 Kg/m² (about 15 pounds per 10 foot length). Edges are sharp!

GIRON (Cat. #A273) ............................... $48.95 per linear foot add g-iron to cart
GIRON full roll (81 feet) (Cat. #A273-roll) ... $3364.00 per roll add giron to cart
(Save 16%)--->

Tin Snips for magnetic shielding

Tin Snips

"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.

Tin Snips (Cat. # A412) ..... $11.99 add mumetal foil snips to cart


Shielded switch plate 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. For severe cases, you can stack a double layer to achieve even better reduction. 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 (3½x5½") and super jumbo (5½x7½") for maximum protection. Make sure you have enough room between outlet and nearby moldings for these larger than standard covers. Very economical!

shielded outlet cover

Shielded Switch Plate:

Oversize (Cat. #A720) ................................ $9.95 each add shielded switchplate to cart
   Oversize, 10 pack (Cat. #A720-10) ................ $80.00 add magnetic shielded switch plate to cart

Super Jumbo (Cat. #A721) ........................ $29.95 each add magnetic switch plate to cart

Shielded Outlet Cover:

Oversize (Cat. #A722) ................................ $9.95 each add shielded outlet cover to cart
   Oversize, 10 pack (Cat. #A722-10) ................ $80.00 add outlet cover shielding to cart

Oversize Double Duplex shielded outlet cover Oversize Double Duplex (Cat. #A724) .................
         ...................................... $11.95 each
add EMF Shielded Outlet Cover to cart

Mu metal 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.)       CAUTION: Foil has sharp edges!
Thickness = 0.004 inches
Magnetic Shielding Foil: 15" wide, 0.004" thick(Cat. #276-04-15)$31.95/linear ft add mumetal foil to cart
Magnetic Shielding Foil: 12" wide, 0.004" thick(Cat. #276-04-12)$21.95/linear ft add mumetal foil to cart

Thickness = 0.010 inches
Magnetic Shielding Foil: 12" wide, 0.010" thick(Cat. #276-10-12)$31.96/linear ft add mumetal foil to cart

Tin Snips

Tin Snips for magnetic shielding "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.

Tin Snips (Cat. # A412) ..... $11.99 add mumetal foil snips to cart

Magnetic Shielding in car How Can I Test Shielding Performance"

How Can I Shield my Car"

Click here for Specifications and Installation Notes

How much is a linear foot?

magnetic foil Linear Foot Image

Because we offer so many different materials, 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.

Mag-Stop Plates Mag-Stop MuMetal magnetic shielding Plates

Mag-StopTM Plates

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)
Joint Shield magnet shield

Mag-StopTM Plates
Cat. #Size
(W x L x T inches)
30 x 29 x .020"
6 lbs.
$548.00 add magnetic shielding metal to cart
30 x 59 x .020"
12 lbs.
$1056.00 add magnetic field shielding plates to cart
30 x 29 x .040"
11 lbs.
$1046.00 add shielding for magnetic fields to cart
30 x 59 x .040"
23 lbs.
$2011.00 add shield for a magnet to cart
30 x 29 x .062"
17 lbs.
$1591.00 add how to shield a magnet to cart
30 x 59 x .062"
35 lbs.
$3061.00 add how to do magnetic shielding to cart
Click here for Specs on Hydrogen Annealed Plates
24 x 120 x .020"
19 lbs.
$1194.00 add annealed magnetic shield to cart
24 x 120 x .040"
38 lbs.
$2388.00 add stress annealed to cart
24 x 120 x .062"
57 lbs.
$3583.00 add hydrogen annealed to cart
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.

how to shield magnetic field, 2 mG line

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.

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. 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.


Joint-Shield magnetic shielding tape

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.

Click here for Specs on Joint Shield

4 inch wide. Specify desired length when ordering.
Joint Shield (Cat. #A277) .................................. $39.95/linear foot add jointshield magnetic tape to cart
Joint Shield [100 ft roll] (Cat. #A277-roll) ...................... $3595.50 add joint shield magnetic shielding adhesive tape to cart

FINEMET® Wide Format Film

Finemet magnetic shielding 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. Finemet magnetic shield Performance 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/ft². Hitachi Part #MS-FR 470-100M-T0. Please allow 3-5 weeks for delivery of a master roll.

FINEMET (Cat. #A271) ...................... $25.95 per lin foot add finemet to cart

FINEMET Full Roll (100 meters) (Cat. #A271-roll) ... $6500.00 (about $19.81 per foot) add finemet high frequency magnetic shield to cart

Magnet Shield ELF shield


High Saturation Magnetic Alloy

Magnet Shield EMF shielding

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.

Applications Notes:

- 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!"
R.M.; Yorktown VA

"I have a panel volt meter installed next to a Variac. The magnetic field from the Variac was affecting the accuracy of the volt meter. After the MagnetShield was wrapped around volt meter and held in place by a 2" hose clamp, the meter is totally unaffected by the Variac. Thank you for making available small amounts of material for buyers. Most companies don't want to deal with such small amounts."

How do I stop the attraction/repulsion between 2 magnets"

Click here for Specs on Magnet Shield

4 inch wide Ribbon:
MagnetShield (Cat. #A274) ........................... $4.50/lin ft add magnet shield foil to cart
MagnetShield [100 ft roll] (Cat. #A274-100) ..... $382.50.00 add best magnet shield foil to cart

Also available in larger dimensions:
MagnetShield Plate 36" x 15" x .015" (Cat. #A274-15) ........... $39.95 add best magnet shield plate to cart

MagnetShield Plate 36" x 120" x .015" (Cat. #A274-36) ....... $259.00 add large magnetic shielding plate to cart*
* 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.

Speaker Magnet Shield Speaker Magnet Shield Speaker Magnet Shield


Reduces Interference with Nearby Objects

We get a lot of calls from sailors and pilots who have a speaker installed in tight quarters near sensitive equipment like a compass or other electronics. The strong magnetic field from the speaker magnet can create havoc! Shielding a compass is not a good idea as it also shields the Earth's magnetic field.

The Speaker Magnet Shield is designed to attach to the back of the speaker magnet reducing magnetic field emissions by 80-90%. Simple to install. Just place it on the back of the magnet. Magnetic attraction keeps it in place even under moderate vibration. Three layers thick (although the design permits using only one or two layers if desired), corrosion resistant, and only 6.5 ounces. Fits magnets up to 3-1/8 inch diameter. Can also be used to shield other small magnets. Note: The Speaker Magnet Shield can only reduce field strength at the back and sides of the magnet. Because of lack of access, the front of the magnet cannot be shielded. Tools may be required for installation.

Speaker Magnet Shield (Cat. #A932) ............. $9.95 add paper shield to cart


PaperSHIELD thin magnetic shield

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.

Bonus application! In addition to shielding magnetic fields, PaperSHIELD is also quite good at shielding radiowaves (cellphone, wifi, etc). And because of the adhesive backing, it can be adhered to almost any (indoor) surface you need.

PaperSHIELD (Cat. #A270) .......................... $18.00/ lin ft add paper shield to cart
PaperSHIELD 82 ft roll (Cat. #A270-roll) .......... $1150.00 add papershield magnetic shield to cart



Round Bar in Various Sizes

If you require round bar stock for your project, we have it! Material is not annealed should be hydrogen annealed after working for maximum performance. There is a $200 minimum order. Choose from several diameters and specify your length in inches.

Cutting charge may apply.

Cat. # Diameter Price per inch
A278-0.25 0.25" $3.32 add mumetal rod to cart
A278-0.47 0.47" $7.65 add best mumetal rod to cart
A278-0.75 0.75" $16.49 add large mumetal rod to cart
A278-0.98 0.98" $32.23 add magnetic shielding rod to cart
A278-1.73 1.73" $60.27 add mumetal to cart
A278-2.36 2.36" $130.54 add hy mu 80 rod to cart
A278-3.94 3.94" $379.44 add magnetic field shield rod to cart



"Versatile Shield for Both RF and Magnetic Fields"

Homeopathic remedies, credit cards and passports with chips, and electronic equipment can all be compromised by exposure to electromagnetic fields. The EMP Can™ is a great air-tight way to store these items and protect them from outside EMF influences including low grade EMP. Shields both radiofrequency and magnetic fields by 95% or more. All metal construction, nice wide mouth and quick-close latch keep contents secure.

In addition, you can put a radiation source (such as a mobile phone or magnet) inside the EMP Can to contain the field.

3.6" wide x 6.5" high

EMP CAN™ (Cat. #A339) ............ $14.95 add Pocket Sticker to cart


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
Field (V/m)
Field (mG)
MµCord™ low EMF cableElectric
Field (V/m)
Field (mG)
MµCord™ low emf wire
534695.807.68 (92% reduction)
1030024.000.96 (96% reduction)
202406.000.12 (98% reduction)
401551.500.014 (99+% reduction)
8074.3700.0019 (99+% reduction)
10065.2400.00096 (99+% reduction)
20044.0600.00012 (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. ¼ inch outer diameter. Black. Specify length in feet

MµCord (Cat. #A223) ........ $1.75 per foot add mucord wire to cart

Make Your Own Shielded
Extension Cord or Appliance Cord

Plug for shielded extension cord Socket for shielded extension 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 add EMF plug to cart
NEMA 5-15R: 3 prong grounded socket (Cat#A224R) ... $5.95 add EMF socket to cart


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) .............. $4.95 add to cart

Spira-Shield magnetic shielded conduit


Need Magnetic Shielding Conduit Just For Wiring?

Spira-Shield provides high permeability magnetic shielding and physical protection for any ROMEX® electrical wiring. Made of .010" thick Magnetic Shielding Alloy. Slips over standard wiring to provide that peace of mind when it must be near electromagnetically active sources. Also reduces interference in stereo and telephone lines. Ground it for the added benefit of E-Field shielding.

Shielding performance depends on many factors, including field strength and tube diameter.
Here are some examples based on DC field, perpendicular to the THIN tube:

Field outside of tube Field inside tube
5 Gauss........................ 1 mG
1 Gauss........................ 0.2 mG
250 mG........................ less than 0.2 mG
Spira-Shield flexible magnetic shielding tube

For clarification: This item protects the cable inside the shield from magnetic fields originating outside the shield.

Thin is 3/8" ID and 1/2" OD. Wide is 3/4" ID and 7/8" OD. Priced per 10 foot length.

Thin Spira-Shield (Cat. # A275-T).....................$241.00 add spira-shield to cart

Wide Spira-Shield (Cat. # A275-W)...................$291.00 add flexible magnetic condiut to cart

1/2 inch and 1 inch ID also available as a special order. Contact us for details.

Magnetic Shielding Alloy Samples

Magnetic Shielding Alloy Sample Pack

Aids in Deciding Which Material to Use

With so many choices, it can be difficult to decide which shielding material to choose for a specific job. You may wonder: How stiff is it? How heavy is it? How easy is it to cut? What color is it? And so on.
Free Shielding Alloy Samples The Sample Pack includes 6 samples of our most popular materials:

  • .004" Magnetic Shielding Foil
  • JointShield
  • MagnetShield
  • PaperShield
  • Giron
  • Finemet
The samples are big enough (typically about 3*5 inches) to get an understanding of the material characteristics, but probably too small to do a shielding test (unless you are using a small magnet at the test source). Also included are specification sheets and application instructions. Best of all, with each sample set you get a $25 coupon good towards the purchase of your desired magnetic shielding materials.

Magnetic Shielding Alloy Samples (Cat. #MSAS) ...... $25.00 add to cart

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