mu-metal discoloration and cleaning

[johnferrier]

So, a few sheets of Ultraperm 80 arrived yesterday and I notice that it's discolored. Not a big deal as it's used inside an enclosure, but it's still unattractive. It appears as a rust color film across ~ 30% of the surface.

An externally hosted image should be here but it was not working when we last tested it.

Although the color appears embedded, I may just clean the surface for a coat of silver color paint. I wonder if anyone has experience cleaning mu metal.


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[DF96]

I think mu-metal is best left as it is. Even bending it reduces its properties, so I can imagine that sanding the surface could disrupt things too.

 

[johnferrier]

I think mu-metal is best left as it is. Even bending it reduces its properties, so I can imagine that sanding the surface could disrupt things too.

I'll simply clean it with a degreaser and use it flat. Thanks.


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[rfj5106]

ultraperm 80--is it effective?

I have seen this stuff advertised but have wondered about its effectiveness. 😕 😕I am about to build an op-amp pre-amp with a phono section. How would I use this stuff in this application? Any advice would be appreciated! Thanks. 😀