Often dubbed the “strongest magnet in the world”, it’s clear to see why Neodymium magnets are so popular. But aside from their strength, what else is there to know about these powerful magnets? Our experts have answered an extensive list of the most frequently asked Neodymium questions and compiled them into this handy guide, perfect for beginners and pros alike.
What are Neodymium magnets made of?
Neodymium magnets (NdFeB) are made up of alloys of rare Earth elements, specifically Neodymium (Nd), Iron (Fe) and Boron (B).
How are Neodymium magnets made?
The raw, rare Earth materials are melted down and cast within a mould to form ingots when cooled. These ingots are then ground to create a powder, which is then sintered into condensed blocks. The blocks are heat treated, cut to shape, surface treated and, finally, magnetised.
Why are Neodymium magnets so strong?
Neodymium magnets are the strongest permanent magnets commercially available - this is due to a number of factors.
The high levels of magnetic saturation within Neodymium magnets allows them to generate large magnetic fields, whilst simultaneously having a high resistance to demagnetisation (also known as coercivity).
What strengths do Neodymium magnets come in?
Neodymium magnets are categorised by the material they are made of, which determines the strength of the magnet and its maximum operating temperature.
A magnet's strength is measured in Mega-Gauss Oersteds (MGOe). The most common strengths are N35, N38, N40, N42, N45, N48, N50, N52 and N55.
The maximum operating temperature of a magnet is defined by letters, and is as follows:
- N – up to 80°C (176°F) operating temperature
- M – up to 100°C (212°F) operating temperature
- H – up to 120°C (248°F) operating temperature
- SH – up to 150°C (302°F) operating temperature
- UH – up to 180°C (356°F) operating temperature
- EH – up to 200°C (392°F) operating temperature
- AH – up to 230°C (446°F) operating temperature
For example, a grade N35AH magnet would have a pull strength of 35 MGOe and a maximum operating temperature of 230°C (446°F). It is worth noting that neodymium magnets can still work well in temperatures of up to -130°C (-202°F) - after which performance begins to reduce. However, if you are planning on using neodymium magnets in extreme temperatures, we would always recommend speaking to one of our team first.
What shapes/forms do Neodymium magnets come in?
Commercially, Neodymium magnets come readily available in discs, blocks, rings, bars, balls/spheres and rods. Get in touch for more information on our bespoke services.
What can Neodymium magnets be used for?
Neodymium magnets are used in many everyday applications from mobile phones and box closures to automotives and aerospace – you’d be surprised what you can find them in! To find out more about magnet uses and applications, visit our applications page.
What are the benefits of Neodymium magnets?
- Due to their rare Earth elements, they are cleaner than alternative magnets
- They are the strongest permanent magnets available on the market
- Due to their strong magnetic force, smaller sizes can be easily hidden or disguised within visual applications
- They can be manufactured to a huge range of shapes and sizes
- Depending on the grade, they are resistant to temperatures up to 220 degrees
If you’ve got any more questions for our team, don’t hesitate to contact us!