The most Frequently Asked Questions about Magnets

I don’t know which magnet to choose for my application, is there someone I can talk to?
Answer: Yes, please feel free to telephone 0144 287 5081 and ask to speak to someone in technical sales. Our friendly staff are trained engineers with extensive product and application knowledge and they are waiting for your call anytime between 08.30 and 17.00.

What is the difference between the different types of magnet materials?
Answer: There are 5 main types of magnetic materials as follows ;
1 – Alnico
2 – Ferrite
3 – Neodymium Iron Boron
4 – Samarium Cobalt
5 – Magnetic rubber

Within each type of material, there are many grades and variations to provide a variety of different magnetic properties.

How permanent is a magnets strength?
Answer: If a magnet is stored away from power lines, other magnets, high temperatures and other factors that adversely affect the magnet, it will retain its magnetism essentially forever.

What might affect a magnets strength?
Answer: Heat/Radiation/Strong electrical currents in close proximity/Other magnets in close proximity to the magnet/Neo magnets will corrode in high humidity enviroments unless they have a protective coating.

Can a magnet that has lost its magnetism be re-magnetized?
Answer: Provided that the material has not been damaged by extreme heat, the magnet can be re-magnetized back to its original strength.

Can I make a magnet that I already have stronger?
Answer: Once a magnet is fully magnetized, it cannot be made any stronger – it is “saturated”.

How do you measure the strength of a magnet?
Answer: Most commonly Gaussmeters which measure the strength in Gauss or Pull-Testers which measure in kgs or pounds.

What are magnetic Poles?
Answer: They are the surfaces from which the invisible lines of magnetic flux emanate and connect on return to the magnet.

What are the different types of magnets available?
Answer: Two types – permanent and electro magnets. Permanent magnets emit a magnetic field without the need for any external source of power. Electro Magnets require electricity in order to behave as a magnet.

What are Rare Earth magnets?
Answer: Rare earth magnets those that are made out of the rare earth group of elements. The most common are Neodymium-Iron-Boron and Samarium Cobalt types.

Which are the strongest magnets?
Answer: Neodymium-Iron-Boron types are the strongest. However at 150 degrees and above Samarium Cobalt can be stronger.

Got another question? Please call us on 0144 287 5081 or e-mail us.