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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Mumetal
Message-ID: <1946@kitty.UUCP>
Date: Wed, 19-Aug-87 10:47:19 EDT
Article-I.D.: kitty.1946
Posted: Wed Aug 19 10:47:19 1987
Date-Received: Fri, 21-Aug-87 07:33:47 EDT
References: <3755@watdcsu.waterloo.edu>
Distribution: rec
Organization: Recognition Research Corp., Clarence, NY
Lines: 22
Summary: Alloy with high magnetic permiability
Xref: mnetor rec.audio:2871 sci.electronics:1179

In article <3755@watdcsu.waterloo.edu>, bmaraldo@watdcsu.waterloo.edu (Commander Brett Maraldo) writes:
> 
>   What is it?

	Mumetal (tm) is a registered tradename of Allegheny Ludlum Steel
Corp.
	Mumetal is an alloy consisting of 77% nickel, 5% copper, 1.5%
chromium, with the balance iron.  Mumetal exhibits an extremely high
magnetic permiability, which makes it ideal for magnetic shielding
applications.  Mumetal is also used for cores in inductors and transformers.
	Mumetal has been around since before World War II, and has been
extensively used.  Two other alloys have approximately the same magnetic
permiability as Mumetal: 4-79 Moly Permalloy (tm), and Hymu 80 (tm).  I am
aware of only one alloy with a magnetic permiability higher than Mumetal:
Supermalloy (tm).
	So the point is: Mumetal is pretty good stuff for shielding devices
against stray magnetic fields.

<>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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