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Frequently Asked Neodymium Magnets Questions

Posted by Lance Carlson on Nov 19th 2017

What is Rare Earth?

Rare earth is an ore primarily mined in China. Rare earth is the source of 17 elements listed on the periodic table as Lanthanides. Two of those elements Neodymium and Samarium are the magnets namesakes that are derived from the rare earth ore. Both Neodymium (Nd) and (SM) Samarium are combined other materials as an alloy used to create rare earth magnets.

What is a Rare Earth Magnet?

Rare Earth Magnets are the strongest permanent magnets in the world. There are two types of rare-earth magnetssamarium cobalt (SmCo) and neodymium (NdFeB). SmCo and NdFeB magnets are made from the ore commonly referred to as “rare earth”. Rare earth contains 17 elements listed on the Periodic Table as Lanthanides. You may also hear the terms REE (rare earth elements) & REM (rare earth metals).


What does N52 mean?

Neodymium magnets are measured by grade N35-N52.

N52 Grade neodymium magnets are the strongest permanent magnets currently available. The ”N” is for Neodymium and the number its grade or strength. A grade of Neodymium (N35-N52) means that a specific concentration of neodymium combined with the processes used and the technical capabilities of the factory producing this batch of Neodymium alloy is physically capable of being magnetized to the assigned “N” grade. A gauss meter must measure N52 grade at 49.5-52 MGOe (units of megagauss-oersteds or MGOe) to be classified as N52. An N35 grade must measure 33-35 MGOe.

Do Neodymium magnets rust?

Neodymium magnets are a composition of mostly Neodymium, Iron and Boron. If left exposed to the elements, the iron in the magnet will rust. Typically in 6-8 months the magnet will be useless. To protect the magnet so from corrosion and to strengthen the brittle magnet material, it is usually coated with a Nickel Copper Nickel covering. This helps some. However, if the magnet is going to be outside it is better to use a samarium cobalt magnet.