where do I buy reef safe magnets?

**rng_pw** · 12-30-2009, 05:52 PM

Im needing to make some frag racks. I have an acrylic tank with 3/4 inch walls and I need a strong reef safe magnet to hold up the racks. What are you guys using and where can I get me some. Thanks.

inactive · 12-30-2009, 06:56 PM

Rare Earth Magents, Ceramics etc...

If you are weary just coat them in plasti-dip or cyanoacrylite.

**damac20** · 12-30-2009, 07:16 PM

http://www.kjmagnetics.com/proddetai...88PC%2DBLK

**rng_pw** · 12-30-2009, 07:43 PM

Does Lowes or Home depot carry ceramic magnets. If not where is the best place to find them?

inactive · 12-30-2009, 07:44 PM

Originally Posted by rng_pw

Does Lowes or Home depot carry ceramic magnets. If not where is the best place to find them?

Harbor Freight, Micheals etc....

**rng_pw** · 12-30-2009, 07:53 PM

thanks alot.

**rng_pw** · 12-30-2009, 08:23 PM

has any one ever tried the neodymium magnets? If so how pull force should I look for if my acrylic is 3/4 inch thick? I do plan on getting plastic coated magnets

**mfinn** · 12-30-2009, 08:35 PM

I made a bunch of frag racks for friends and club members using black eggcrate, neodymium magnets and 2 part epoxy.
I used the 1" dia x 3/8" thick for the inside that was enclosed in epoxy and for people who had 3/4" glass/acrylic, I used the same sized magnet for the outside.

**rng_pw** · 12-30-2009, 08:43 PM

those are some huge magnets. How big of a frag rack will they hold

**mfinn** · 12-30-2009, 08:56 PM

Originally Posted by rng_pw

those are some huge magnets. How big of a frag rack will they hold

I was making them 12" x 5", using 2 on the inside and 2 on the outside.
You could go even a little longer, maybe a inch, inch and a half.
I made some that were 23"x 5-1/2" using 3 sets of magnets.

**mfinn** · 12-30-2009, 09:06 PM

Here is a little more info and a couple pictures.
When I first started this project, I used a polyester casting resin, but a couple people became concerned about the polyester resin becoming brittle and breaking up in about 3-5 months ( I think).
I then switched to a 2 part epoxy.
I recently talked to most of the people that had the racks made from polyester resin and everyone said their frag racks were just fine, after about a year. I have a couple that are a little older.

frag racks - Reef Central Online Community

**rng_pw** · 12-30-2009, 10:21 PM

those are nice frag racks. Thanks for all of the info

**mfinn** · 12-30-2009, 10:22 PM

Originally Posted by rng_pw

those are nice frag racks. Thanks for all of the info

Thanks
If you have any questions on how I made them feel free to ask. It's really pretty easy.

**rng_pw** · 12-30-2009, 10:53 PM

Yeah I will thank again.

**mfinn** · 12-30-2009, 10:58 PM

Originally Posted by rng_pw

has any one ever tried the neodymium magnets? If so how pull force should I look for if my acrylic is 3/4 inch thick? I

These are the ones I used.

Neodymium Magnets N42 Dia 1"X3/8" NdFeB Rare Earth Magnets :: 1/2" < Diameter < = 1.0" :: Discs :: Neodymium Magnets :: Neodymium Magnets || NdFeB Magnets || Rare Earth Magnets - Industrial Magnets & Assemblies, Super Powerful Magnets, Wind Solar Pow

**rng_pw** · 12-31-2009, 01:04 AM

So you used them on the inside and the outside of the tank? If not what do you use on the out side, and how big of a frag rack were you able to make with them? thanks again for all of your help.

Originally Posted by mfinn

These are the ones I used.

Neodymium Magnets N42 Dia 1"X3/8" NdFeB Rare Earth Magnets :: 1/2" < Diameter < = 1.0" :: Discs :: Neodymium Magnets :: Neodymium Magnets || NdFeB Magnets || Rare Earth Magnets - Industrial Magnets & Assemblies, Super Powerful Magnets, Wind Solar Pow

**mfinn** · 12-31-2009, 07:59 AM

Originally Posted by rng_pw

So you used them on the inside and the outside of the tank? If not what do you use on the out side, and how big of a frag rack were you able to make with them? thanks again for all of your help.

I was making them 12" x 5", using 2 on the inside and 2 on the outside.
You could go even a little longer, maybe a inch, inch and a half.
I made some that were 23"x 5-1/2" using 3 sets of magnets.