Zinc spray

[Guzzi]

I found zinc spray 97%, can i use it as a shield?

regards

Leendert

[simonbaker]

I found zinc spray 97%, can i use it as a shield?

regards

Leendert

I don't know, but sounds interesting. I'll bet you can.

If you have some, spray it on a surface and measure the conductivity and let us know what you find. Try different thicknesses and number of coatings.

How much does it cost?

Regards,

-SB

[Guzzi]

Zinc spray

I do not have the zinc spray yet, but it is not expensive about € 10,-
The brand is MAHOTEC, the say it is conductive.

[homefire]

Lead tape has been used effectively for a shield.

I don't see why Zinc would not work.

Mechanical Contact would be the only way to wire it.

[6666]

I am making enquiries about this product

http://www.eal.com.au/proddetail.php?prod=EAL-ColdGalv

[dfbowers]

Lead tape has been used effectively for a shield.

I don't see why Zinc would not work.

Mechanical Contact would be the only way to wire it.

Here is a way to test the effectiveness of your shield. I got this idea from building an electroscope posted elsewhere on the forum. Actually, a simple spiral wrap of bare wire around your coil can be amazingly effective, even with fairly large gaps between the wraps.

This will test the effectiveness of shielding from static charges and can sense the charge on a plastic cup from several feet away on an unshielded coil.

If the LED toggles from dark to light, it is sensing a positive charge.
If the LED toggles from light to dark, it is sensing a negative charge.

Don

[Dr Vel]

On the subject of shielding I am curious if anyone knows about the material linked below. $30 free S/H for a sheet 60" by 36" of carbon fiber cloth. I am wondering if it is conductive enough to work for coil shielding.

http://www.ebay.com/itm/Carbon-Fiber...item4ab18487c2

[6666]

From post # 5

"Yes, the Bright Gal has a bright silver finish.
Our Cold Gal has a very high content of Zinc in the dry film so it would be
conductive.
We do not have data to say how conductive it would be, but Zinc is not a
highly conductive metal.

Kind regards
Peter Cassidy
Engineering Adhesives & Lubricants (Aust) Pty Ltd
Tel: (07) 5531-4242
Fax: (07) 5531-4243
Email: [email protected]
Visit us on-line: www.eal.com.au "

[Dragon44]

We used to use Nickel spray for RF applications

[dfbowers]

On the subject of shielding I am curious if anyone knows about the material linked below. $30 free S/H for a sheet 60" by 36" of carbon fiber cloth. I am wondering if it is conductive enough to work for coil shielding.

http://www.ebay.com/itm/Carbon-Fiber...item4ab18487c2

I was looking at some carbon fiber rods that I have for filler material in some of my coils. Just as a quick check, I checked them with an ohm meter and consequently did not use them because they were conductive. I would bet that it would work.

I suppose the idea is to find something conductive to use as a sheilding material but cannot be detected by the coil, like a mylar survival blanket.

Don

[golfnut]

Weld thru primer.

Cant recal the brand - that was zinc or nickel I recall.

S

[Tinkerer]

Here is a way to test the effectiveness of your shield. I got this idea from building an electroscope posted elsewhere on the forum. Actually, a simple spiral wrap of bare wire around your coil can be amazingly effective, even with fairly large gaps between the wraps.

This will test the effectiveness of shielding from static charges and can sense the charge on a plastic cup from several feet away on an unshielded coil.

If the LED toggles from dark to light, it is sensing a positive charge.
If the LED toggles from light to dark, it is sensing a negative charge.

Don

Thank you 6666 for posting the link.

I am specially impressed with the following sentence: This will test the effectiveness of shielding from static charges and can sense the charge on a plastic cup from several feet away on an unshielded coil.
We have still not come to a conclusion of how much static and how much EMI are involved with the coil shielding.
We know that submersed in saltwater, no shield is needed.
We know that close to the ocean humidity it is difficult to build a static field.
Do we have any information about static effects on saltwater beaches?
We know that wet grass can be a problem. Is that due to static? or conductivity?

Any opinions? experiences?

[Koala]

I know a coil that tests fine on a nice flat lawn can chatter madly on a farm pasture.

I did fix it by adding some copper slug tape around the edge of the coil so definitely a shield problem.

long wet grass seems to be the worse at causing chatter. Whereas dry sand isn't too bad even with a faulty coil shield.