Neodymium (Rare Earth) Magnets

Neodymium magnets are a member of the rare earth magnet family and are the most permanent magnets in the world. They’re composed of Neodymium (Nd), Iron (Fe) and Boron (B), which makes them vulnerable to rust if they’re exposed to the elements. To protect the magnet from corrosion and to strengthen the brittle magnet material, the magnet is usually coated with nickel. Neodymium Magnets, however, will still be brittle and subject to corrosion.

Things to know and Safety.

If left exposed to the elements, the iron in the magnet will rust. To protect the magnet from corrosion and to strengthen the brittle magnet material, they are coated in nickel plating. Other coating options are zinc, tin, copper, epoxy, silver, and gold. Neodymium Magnets, however, will still be brittle..

Neodymium magnets must be handled with care to avoid injury and damage to you and the magnet. Keep the following things in mind when handling neodymium magnets:

• Fingers and hands can get severely pinched between two attracting magnets. It is important that they are kept out of the reach of small children.
• Neodymium magnets are brittle and can peel, crack or shatter if allowed to slam together.
• Eye protection should be worn.
• Neodymium magnets can also damage items such as credit cards, magnetic identification cards, or videotapes.
• Never place neodymium magnets near electronic devices. It is crucial to never allow them near a person with a pacemaker or similar medical aid.
• Neodymium magnets should not be machined. The material is brittle and prone to chipping and cracking, so it does not machine well by conventional methods. Machining the magnets will generate heat, which if not carefully controlled, can demagnetize the magnet or even ignite the material which is toxic when burned.