Some magnet alloys are more susceptible to this. Below is a table that illustrates the general tolerances of the common commercial magnet alloys to corrosion, impacts, and external magnetic fields.
Heat will always have an effect on permanent magnets, but most storage and transportation methods will never reach a sufficient temperature to cause an irreversible loss in a magnet. However, high temperatures will accelerate negative effects from corrosion and demagnetizing fields. It is a good practice to store magnets in an environment that a human would find comfortable. If you have older magnets, or magnets that have had a questionable storage history, steps can be taken to evaluate the inventory.
Please contact a Dura Magnetics Customer Service Representative to discuss your storage options, as well as handing methods, within your supply chain. The maximum operating temperature of a magnet is an important property, but it is simply the point beyond which the magnet will experience an irreversible loss in net magnetization. In actuality, a magnet will lose net magnetization as soon as it starts to heat up.
In sizing and selecting magnets and custom magnetic assemblies, it is important to ask a number of questions about the working area in which the magnet will operate. The answers to these questions help deliver a higher level of success in providing a magnet that meets the fit, form, and function of the application. Learn more. How long does a permanent magnet remain a magnet? Ask Question.
Asked 10 years, 2 months ago. Active 5 years ago. Viewed 45k times. Improve this question. Community Bot 1. Everyone Everyone 4, 5 5 gold badges 35 35 silver badges 66 66 bronze badges. But in terms of this particular question, you probably should be asking something more precise, like what is the timescale associated with the decay of the total magnetic moment of the magnet. Add a comment. The simple answer is, no, there is no shelf life; however, as all things go with magnets, it is not that simple The maximum operating temperature of a magnet is an important property, but it is simply the point beyond which the magnet will experience an irreversible loss in net magnetization.
In actuality, a magnet will lose net magnetization as soon as it starts to heat up. Get all the latest magnetic news, resources and success stories right in your inbox:. Sign Up. This field should be left blank. Search for keywords:. Tech Briefs. Do Magnets Wear Out? Read on to See If Magnets Lose Their Power Over Time In the absence of external influences, a commercially viable magnet alloy should remain magnetic for hundreds of years.
Does Temperature Affect the Strength of a Magnet? Over a longer period of time, random temperature fluctuations, stray magnetic fields and mechanical movement will cause magnetic properties to decay. However, this effect is very slow.
If magnets are handled carefully and stored with metal keepers between their poles to constrain the magnetic fields, they will last for many years. Modern magnets made of rare earth alloys may even last for centuries.
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