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High Permeability Materials (including MuMetal®) for Magnetic Field Shielding, Blocking, Mitigation, and Protection    
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Magnetic Field Shielding
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Download our free Guidelines For Installing Magnetic Shielding
Shielding FAQs More answers to Magnetic Shielding Questions


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)
PaperShield (low performance)
Magnetic Shielding Foil
Mag-Stop Plates (large format)
JointShield (adhesive on one side)
Finemet (kHz range)
CobalTex (MHz range)

GIRON

GIRON

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 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.
GIRON

  • 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 add to cart
GIRON full roll (81 feet) (Cat. #A273-roll) ... $2912.76 per roll add to cart
(Save 20%)



GIRON

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!

Tel: +1-518-608-6479
e-mail: lessemf@lessemf.com

Giron Design & Installation Process:
Example of retrofit Giron Shielding inside a historic building:




Mu metal Magnetic Shielding Foil

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 wide       CAUTION: Foil has sharp edges!

Magnetic Shielding Foil: 15" wide, 0.004" thick (Cat. # A276-15) ..... $24.95/linear ft add to cart

Magnetic Shielding Foil: 15" wide, 0.010" thick (Cat. # A276-10) ..... $31.95/linear ft add to cart

Tin Snips

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 to cart


Click here for Specifications and Installation Notes



How much is a linear foot?

Linear Foot Image

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.


Mag-Stop MuMetal<SUP>®</SUP> Plates

Mag-StopTM Plates

Flat surface magnetic shielding for large or small areas

Mag-Stop Plates 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

or
2] butt joints tightly and cover over the joints with Joint Shield (see diagram at right)
Joint Shield


Mag-StopTM Plates
Cat. #Size
(W x L x T inches)
Approx.
Weight
Anneal
Type
Price
A277-0229
30 x 29 x .020"
6 lbs.
Hydrogen
$548.00 add to cart
A277-0259
30 x 59 x .020"
12 lbs.
$1056.00 add to cart
A277-0429
30 x 29 x .040"
11 lbs.
$1046.00 add to cart
A277-0459
30 x 59 x .040"
23 lbs.
$2011.00 add to cart
A277-0629
30 x 29 x .062"
17 lbs.
$1591.00 add to cart
A277-0659
30 x 59 x .062"
35 lbs.
$3061.00 add to cart
Click here for Specs on Hydrogen Annealed Plates
A277-0224
24 x 120 x .020"
19 lbs.
Stress
$1194.00 add to cart
A277-0424
24 x 120 x .040"
38 lbs.
$2388.00 add to cart
A277-0624
24 x 120 x .062"
57 lbs.
$3583.00 add 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.
See "Foil" at top of this page for Specs for Stress Annealed Plates



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.

Method:

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.




IMPORTANT NOTICE:

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™

Joint-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.

Click here for Specs on Joint Shield

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



FINEMET® Wide Format Film

Finemet

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 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/ft˛. Hitachi Part #MS-FR 470-100M-T0

Specify desired length when ordering.
May have splices. FINEMET (Cat. #A271) ...................... $22.28 per lin foot add to cart

FINEMET Full Roll (100 meters) (Cat. #A271-roll) … $5430.00 (about $16.70 per foot) add to cart



Magnet Shield

MagnetShield

High Saturation Magnetic Alloy

Magnet Shield

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

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 to cart
MagnetShield [250 ft roll] (Cat. #A274-roll) ..... $844.00 add to cart

Also available in larger dimensions:
MagnetShield Plate 36" x 15" x .015" (Cat. #A274-15) ........... $39.00 add to cart

MagnetShield Plate 36" x 120" x .015" (Cat. #A274-36) ....... $259.00 add 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.



PaperSHIELD

PaperSHIELD

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 add to cart
PaperSHIELD 82 ft roll (Cat. #A270-roll) …..….. $875.00 add to cart



MuMETAL® WIRE

MUMETAL WIRE

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

Note:
.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

Mumetal® Wire .005" diam. (Cat. #A275-5) .... Sale! Regularly $75/lb now only $55.00/lb add to cart
Mumetal® Wire .025" diam. (Cat. #A275-25) ….…..... $75.00/ lb add to cart



MµCord™

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
MµCord™
Distance
(cm)
Electric
Field (V/m)
Magnetic
Field (mG)
MµCord™Electric
Field (V/m)
Magnetic
Field (mG)
MµCord™
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. Equivalent to 18/3 SVT, rated for 14 Amps, 300 Volts. Ľ inch outer diameter. Black. Specify length in feet

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


Make Your Own Shielded
Extension Cord or Appliance Cord

Plug Socket 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 to cart
NEMA 5-15R: 3 prong grounded socket (Cat#A224R) ... $5.95 add to cart



3 OUTLET SOCKET ADAPTER

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 add to cart


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