From: Jerry Avins on
Jerry Avins wrote:
> Tim Wescott wrote:
>> On Mon, 23 Nov 2009 13:55:37 -0500, PeterD wrote:
>>
>>> On Mon, 23 Nov 2009 12:41:46 -0600, Tim Wescott <tim(a)seemywebsite.com>
>>> wrote:
>>>
>>>> A long-term back-burner project just got my attention when I found out
>>>> that Home Depot sells magnetic paint.
>>>>
>>>>
>>> Interesting! What is it called, and is there a web reference?
>>
>> Searching on "magnetic paint" on the Home Depot or Rust-Oleum sites
>> should get you there.
>
> It's either soft iron, or it needs a strong field to polarize it. How is
> it used? (IIRC, the permeability of ceramic magnets id low, so they
> support large gaps too.)

From what I found searching, it's soft. that is, magnets are attracted
to it, but it's not attractive on its own.

Jerry
--
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
From: Tim Wescott on
On Mon, 23 Nov 2009 17:50:19 -0500, Jerry Avins wrote:

> Jerry Avins wrote:
>> Tim Wescott wrote:
>>> On Mon, 23 Nov 2009 13:55:37 -0500, PeterD wrote:
>>>
>>>> On Mon, 23 Nov 2009 12:41:46 -0600, Tim Wescott
>>>> <tim(a)seemywebsite.com> wrote:
>>>>
>>>>> A long-term back-burner project just got my attention when I found
>>>>> out that Home Depot sells magnetic paint.
>>>>>
>>>>>
>>>> Interesting! What is it called, and is there a web reference?
>>>
>>> Searching on "magnetic paint" on the Home Depot or Rust-Oleum sites
>>> should get you there.
>>
>> It's either soft iron, or it needs a strong field to polarize it. How
>> is it used? (IIRC, the permeability of ceramic magnets id low, so they
>> support large gaps too.)
>
> From what I found searching, it's soft. that is, magnets are attracted
> to it, but it's not attractive on its own.
>
> Jerry

Right. I'm looking for an armature material for an oddball electromagnet
-- big, light (well, relatively), and capable of supporting a significant
AC component without wasting it all as heat.

--
www.wescottdesign.com
From: PeterD on
On Mon, 23 Nov 2009 13:35:38 -0600, Tim Wescott <tim(a)seemywebsite.com>
wrote:

>On Mon, 23 Nov 2009 13:55:37 -0500, PeterD wrote:
>
>> On Mon, 23 Nov 2009 12:41:46 -0600, Tim Wescott <tim(a)seemywebsite.com>
>> wrote:
>>
>>>A long-term back-burner project just got my attention when I found out
>>>that Home Depot sells magnetic paint.
>>>
>>>
>> Interesting! What is it called, and is there a web reference?
>
>Searching on "magnetic paint" on the Home Depot or Rust-Oleum sites
>should get you there.

http://www.rustoleum.com/CBGProduct.asp?pid=127, nothing came up with
the suggested search terms however.
From: Glen Walpert on
On Mon, 23 Nov 2009 16:32:26 -0600, Tim Wescott <tim(a)seemywebsite.com>
wrote:

>> On Nov 23, 10:41 am, Tim Wescott <t...(a)seemywebsite.com> wrote:
>>> A long-term back-burner project just got my attention when I found out
>>> that Home Depot sells magnetic paint.
>>>
>>> The paint got me thinking -- if they can make latex paint with iron
>>> powder in it, can I buy some sort of plastic resin with iron powder in
>>> it and make my own custom magnetics on the cheap?

Devcon A is the original epoxy filled with a high percentage of
"steel" of some sort. It was around in the 60's and is still
available:

http://www.freemansupply.com/PlasticSteelPuttyD.htm - first source
googled, I never used them.

There are now others, turned up with search on "iron filled epoxy":

http://www.freemansupply.com/IronFilledEpoxyCas.htm

None of which discuss magnetic properties, but you could try calling
the mfgrs.
From: Michael A. Terrell on

Tim Wescott wrote:
>
> If you could give me a list of the brands that you're familiar with I'll
> go check specifications myself, thanks.


http://jbweld.net/products/jbweld.php lists 'liquid steel' as one part
of their epoxy. Who knows what they mean?


--
The movie 'Deliverance' isn't a documentary!
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