How Long Will Your Magnet Last

So how long should my permanent magnet last?

Your permanent magnet should lose no more than 1% of its magnetic strength over a period of 100 years provided it is 

specified and cared for properly. There are a few things that may cause your magnet to lose its strength:


Heat above the maximum level rated for the magnet material in your separator will decrease the strength of the magnet. 

Standard rare earth material from MPI has a maximum temperature of 176°F and standard ceramic material has a maximum 

temperature of 400°F. Higher temperature materials are available and may have been used in your system. Consult the factory

 if you have questions on what the maximum temperature is for your system.


Sharp impacts to the magnet from physical abuse or handling can result in the decreased magnet strength. The magnet

 material inside your separator is brittle and these impacts can lead to fractures in the material, weakening its strength.



Welding on or around the magnet can lead to decreased magnet performance. This can be a result of the heat or current 

generated from the welding process.


If your magnet housing is compromised, moisture can enter the housing of the magnets. This can lead to oxidation of 

the magnet material which will eventually lead to a weakened magnetic system. If the housing is compromised, the magnet 

should also be replaced for sanitary concerns.



Contact: Daniel Wong

Phone: +86-18072358327

Tel: +86-18072358327


Add: YIWU County, Zhejiang Province, China

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