Posted by C.a.b. Johnson on
URL: https://www.es-forum.com/EMF-Blocking-tp3349069p3358163.html


On Tuesday, September 20, 2011 6:46 PM Emil wrote:

There are no fabrics which can shield low frequency magnetic fields. The shielding fabrics will shield radiowaves.

Then

On Tue, 9/20/11, S Andreason <[hidden email]> wrote:

The only way to block magnetic is with Mu-Metal. It is the specific rare  metals in layers that accomplish the blocking, so there is no way to make it into a fabric.

Well, it appears there is some misinformation out there from certain sites that sell RF sheilding fabrics, which has caused me a bit of confusion.  Some of these sites will say something like:  Grounding this fabric gives the added benefit of shielding EMF's as well as RF.   Or, it is not necessary to ground this fabric unless you want to shield EMF's too.  Well, EMF stands for Electro Magnetic Fields.  So if they are only talking about shielding the Electro part of EMF they should not imply that it is shielding the Magnetic part too.

Also,  Less EMF sells several products other than Mu Metal for shielding Magnetic Fields.  Weather they are effective I do not know. 

But I am looking to shield the refrigerator motor, the front floor of my car, and my body parts.   But, Mu Metal is way out of my price range of afordability..

On the bottom of the page at http://www.lessemf.com/fabric.html

there is a discussion of how to make a fabric that could be used to shield magnetic fields by gluing Metglas Magnetic Shielding Film, onto shielding fabric. http://www.lessemf.com/magnetic_shielding.html

It says that Metglas gets saturated easily and is best suited for when the magnetic field is not strong, so obviously it would not work for refrigerator motors, or vacuum or car floor, but I wonder if it would work for a mat under my mattress on the floor to shield from wires in the floor, or to tape onto a chinese 3 panel screen to put up as a barrier in front of my sleeping area, or as a hat?  

And then there is Giron at http://www.lessemf.com/magnetic_shielding.html

GIRON at $44.95 per foot instead of about $225 per sq foot for Mu Metal sounds like a possible alternative. 

It says Giron cuts with snips, can be used flat or molded into shapes. Is 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! 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).

So do you think these materials are an alternative to Mu Metal that would also be affordable and effective for blocking Magnetic Fields? 

Also, do these materials have to be grounded if I wear them or otherwise?

Thanks, I would appreciate any input.

C. Johnson
Superdrove


--- On Wed, 9/21/11, S Andreason <[hidden email]> wrote:


I still find avoidance is easier.



Stewart          
                             
   
 

 
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