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Magnetic Sheet Material

10/24/2011 12:20 PM

Dear Friends and Associates,

I am looking for a magnetic sheet material.

Several months ago, someone sent me a piece of magnetic material, about 1/8-inch in thickness. It was rubber-like in consistency, fairly flexible, and easy to cut with a good pair of scissors.

When I first received it, I thought it just the typical 'refrigerator magnet' material, but was amazed by a couple of it's properties: It was magnetic only on one face, and it was amazingly strong ... much more tenacious than I expected. A piece about the size of a post-card, put to the side of a filing cabinet, couldn't be moved except by pealing off.

I have searched for this material, and did find something similar with a company called XCEL Products, but the samples from them are not as strong.

I am not aware at all of the base magnetic material used in the sample I first saw, but it presented 'silver-gray' stripes (one side) in a dark gray substrate. The material from XCEL was all dark gray with no visual evidence of the magnetic material. It was however, magnetic on one side only.

The geometry seems clear as sketched here ... basically just and extruded series of 'U' shapes, thus very low stray field on the back side.

Does anyone have any idea of this material? Any information will help.

Kind regards ...

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#1

Re: Magnetic Sheet Material

10/24/2011 12:54 PM

Armstrong Magnetics.

There may be probably are others. This is one I am familiar with.

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#2

Re: Magnetic Sheet Material

10/24/2011 3:34 PM

This is my supplier.

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#3

Re: Magnetic Sheet Material

10/24/2011 11:05 PM

AFAIK it is extruded first, then magnetised later.

http://www.alibaba.com/trade/search?SearchText=strong+plastic+magnet&Country=&CatId=0&IndexArea=product_en&fsb=y&viewAllCategory=

may be of help.

P.S. Keep it away from your credit cards, or yer'll be sorry!

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#4

Re: Magnetic Sheet Material

10/25/2011 5:49 AM

This was discussed a while back. It's called a Halbach array.

http://cr4.globalspec.com/thread/73200/Magnetic-Sheet-Material?frmtrk=cr4digest

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#6
In reply to #4

Re: Magnetic Sheet Material

10/25/2011 11:02 AM

Sorry, I messed up pasting the link.

Should be:

http://en.wikipedia.org/wiki/Halbach_array

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#5

Re: Magnetic Sheet Material

10/25/2011 6:18 AM

The fridge magnetic tends to be .5mm maximum, the stuff for vehicle signs is .9/.85mm thick. It's native colour is brown/black, but it is usually faced with an adhesive vinyl. If you have a local signmaker he/she will have some.

It does not all have the same power of attraction. I have a roll here that won't even stay rolled up without tape on it, and a roll that you have to get your nails under to pull it open.

Although if yours was 1/8th it wasn't this stuff.

CNC

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#8
In reply to #5

Re: Magnetic Sheet Material

10/25/2011 5:08 PM

CJ,

Do you have any sourcing info or specifications on the stuff you describe as "a roll that you have to get your nails under to pull it open" ... this sounds like something I could use.

Kind regards ...

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#10
In reply to #8

Re: Magnetic Sheet Material

10/26/2011 5:45 AM

It's the product you have discounted, the ordinary vehicle magnetic sheet. It sounds like, as you say, the material you are looking for is in a different league. I have never seen any with the stripes on the back.

CNC

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#7

Re: Magnetic Sheet Material

10/25/2011 5:06 PM

Thanks to all, so far, for their input, but so far, I haven't found what I am looking for.

The material I had seemed much more than just signage-type material, and definitely more than the run-of-the-mill 'refrigerator' magnet material. I have nothing to play with at the moment, but what I recall was something that had a remarkable strength.

I work in design and manufacturing, and often, we 'attach' things magnetically. Until several months ago, the system of choice was small Neodymium magnets ... anywhere from the size of a dime or smaller, to maybe the size of a nickel. But, the cost of Neo has skyrocketed to the point that a piece that used to cost $0.05 each, is now closer to $0.40 each. It doesn't sound like much of an increase, but in some designs I am using 6 or 8 pieces.

I really believe this material I reviewed several months ago could take the place of Neo slugs in some of these applications ... if only I could find the same or similar material.

Kind regards ...

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#9

Re: Magnetic Sheet Material

10/25/2011 6:08 PM

Hi

I can't help but am fascinated by what you are looking for or seen in the past. I will just follow this thread for a while and see what comes up. I too have an application for such a material but it is not as urgent.

Good luck, Ky.

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cnc jim (2); DCaD (2); Doorman (1); ky (1); Rixter (2); Stuart21 (1); WJMFIRE (1)

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