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PostSubject: Using Magnets   Sun Jun 14, 2009 1:12 pm

I have a product where I have magnets in some parts of it. When I heated the magnets up, they lost their strength. This finding was confirmed this morning when a friend warned me of the same issue if washing magnets in a hot diswasher. The magnets I heated up when first making my prototype were exposed in an oven @ 270 degrees.

If I ensure that these magnets are not exposed, but centered in a blob of plastic, will they be protected enough to be washed in a sink of hot water without losing strength?

Thanks Very Happy
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StephenBozzone

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Location : Research Triangle NC

PostSubject: Re: Using Magnets   Sun Jun 14, 2009 5:43 pm

Great question. See what you can discover when you start to experiment and prototype.

Short answer, washing in a sink of hot water should be OK. Keep away from ovens. Here is a more in depth answer.

I did a bit of research and found this from: http://www.rare-earth-magnets.com/magnet_university/magnets_FAQ.htm

"Will my magnets demagnetize if I heat them?

Yes, if you heat them beyond 170 degrees Fahrenheit (80 degrees Celsius) the magnets will quickly loose their magnetic properties. Sustaining these temperatures for a length of time or heating the magnet significantly higher than this will permanently demagnetize it. Other types of magnets such as Samarium-Cobalt have higher heat resistance. There are also other types of Nd-Fe-B magnets that are not as susceptible to heat induced flux degradation."


I have read that companies do insert mold magnets in an injection molding process. It would depend on what type of plastic you are using and the type of magnet.
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PostSubject: Re: Using Magnets   Sun Jun 14, 2009 10:30 pm

Great!

Thanks so much Stephen! Very Happy
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Troy Robison

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Location : Sunny, Florida

PostSubject: Re: Using Magnets   Mon Jun 15, 2009 7:33 am

Tania, years ago I had the same problem with magnets....I new very little about magnets, guess I missed that part in school.. I ended up talking to some proffessors at the University Of Kentucky to get educated on the magnets.....I needed small magnets that had a lot of power. The University got me tied up with a company "Crumax" I was able to get more educated from them also. Crumax sells all different kinds of magnets, check the out.

One thing I didnt know was anyone that has a heart pacemaker should stay away from any type of magnets.

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Troy Robison

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PostSubject: Re: Using Magnets   Mon Jun 15, 2009 12:32 pm

I'll be reading all about magnets today. These little things are a lot more interesting than I first thought!

Thanks Gizmo!
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