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Dried up Ferrofluid?

What causes ferrofluid to dry up?  Heat, usage, age?  Is there a usual shelf life, as in, do most 15-20 year old tweeters that originally used ferrofluid, need new ferrofluid?

How is it checked, where is it bought, is the replacement generally the same from tweeter to tweeter?

Thanks ahead of time for any info regarding this!  I figure that there are quite a few good speakers out there that are getting up there in age so this may be something I’ll want to learn to do!
128x128b_limo
tablejockey
3,771 posts
 
Google is you friendhttps://www.google.com/search?client=firefox-b-1-d&q=ferrofluid+tweeter+repair
You should check the level via the dipstick first, before going thru the hassle.

erik_squires
15,654 posts
 
Not exactly an end of the world skill I was worried about not having! LOL

What makes you think of this right now? Are you going to be buying some used speakers?
b_limo's avatar
b_limo OP
2,271 posts
 
Im a prep’er, lol.  You may have cases of water, I’ll have cases of ferro fluid.

Its just that a bunch of speakers I look at buying are getting up there in age.  Some of them are 20 years old...
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