Yes. Although they have the highest magnetic field strength and have a higher coercivity (which makes them magnetically stable), neodymium magnets have a lower Curie temperature and are more sensitive to heat and vulnerable to oxidation than samarium-cobalt magnets.
While neodymium magnets have been proven to retain their effectiveness up to 80°C or 176°F, this temperature may vary depending on the grade, shape and application of the particular magnet. High temperature grades of neodymium magnets are available for applications that may expose the magnets to heat above the normal maximum operating temperature.
If a magnet is heated above its maximum operating temperature (176°F/80°C for standard N grades) the magnet will permanently lose a fraction of its magnetic strength. If they are heated above their Curie temperature (590°F/310°C for standard N grades), they will lose all of their magnetic properties.
Corrosion can cause unprotected magnets to shed their coating and crumble into a powder. Use of protective surface treatments such as gold, nickel, zinc and tin plating and epoxy resin coating can provide corrosion protection.
Our magnets are finished with a three-layer nickel/copper/nickel plating, and this coating provides enough protection for most applications. But remember, neodymium magnets are not waterproof. They will rust or corrode in the presence of moisture. If used underwater, outdoors or in a moist environment, they can corrode and lose magnetic strength.
If you need magnets for applications that may expose them to moisture, consider trying our sewing magnets which are encased in PVC to protect them. We also have other coating options available which are weather resistant, contact us for more information.
Fast, professional service
These magnets are so strong that it is difficult to separate them without using some kind of prying tool, my fingers alone are too weak to do it. They will do the job I purchased them for very well.
The magnets I received were shipped quickly and securely, and I had no issues with delivery. They were packed well and in good shape when I received them. I noticed no defect with the magnets and I I was able to use them exactly as I intended on back of a piece of jatoba for a magnetic knife strip. I routed a track to 1/8” and glued and epoxied the magnets in place. The magnets provide sufficient pull strength to hold knives without being too energetic about grabbing them from the hand. These met my need precisely and I would purchase again if I decide to make more of these magnetic knife holders.
I used the magnets on a wooden toy box for my grandson. Easy to install and the perfect strength. I will be buying different sizes for other projects.
Ordered these magnets for a project that I was working on. Received as stated & described, the magnets are what I was looking for. Will order from them again.
Used this for a hobby project I’m working on and the magnets held my project together very well. The finish on them were uniform and packaged them very well. They were shipped and received very timely and will be re-ordering more.
Good customer service, great price & quick to ship
I was hoping to find a strong, low profile magnet to use on my project - which is a restoration of a WWII Army Footlocker. I wanted to attach some old photos and postcards to the underside of the lid, but without using any permanent adhesives which may have affected my paint job. These worked perfectly!
Just what I needed and at the right price.....
Will purchase more when needed.
Have used before & reordered magnets for customized windows alarm contacts. Work fantastic & slim profile allowing no issues opening & closing windows.
me use these to stop 1/24 scale drag racing slot cars !!
1/2 x 1/8 Inch Strong Neodymium Rare Earth Disc Magnets N52 (24 Pack)