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From: hes@ecsvax.UUCP (Henry Schaffer)
Newsgroups: net.micro
Subject: Re: Looking for mu-metal (used in floppy disk containers)
Message-ID: <866@ecsvax.UUCP>
Date: Fri, 6-Dec-85 09:23:02 EST
Article-I.D.: ecsvax.866
Posted: Fri Dec  6 09:23:02 1985
Date-Received: Sun, 8-Dec-85 03:20:19 EST
References: <11153@ucbvax.BERKELEY.EDU>
Organization: NC State Univ.
Lines: 45

> I'm looking for a metal or metal-alloy called `mu-metal' (mu as in the
> greek letter). It is reputed to be a near perfect magnetic insulator or
> shield. It has reportedly been used for making floppy disk containers
> 
> 	Erik E. Fair	ucbvax!fair	fair@ucbarpa.berkeley.edu

  To shield floppies and other magnetic media, one can use standard
magnetic shielding materials.  Mu-metal is one such, but there are
other types.  Some care has to be taken in fabricating carrying
cases, because working with these materials can alter their magnetic
shielding properties (and then you have to re-anneal the metal.)
Magnetic shielding is most commonly used to shield CRT tubes, and
many of the companies which make CRT shields have also started 
producing stock products for carrying magnetic tape, cartridges, etc.
Most of them sell foil shielding material which can be used to
line a carrying case.
Here is a list of some companies:

Ad-vance Magnetics, Inc.     This company sells data media
625 Monroe St.               carrying cases.
Rochester IN  46975
(219)223-3158

amuneal Mfg. Corp
4737 Darrah St
Phila. PA  19124
(215)535-3000

Eagle Magnetic Co., Inc.
PO Box 24283  
Indianapolis, Ind, 46224
(317)297-1030

Magnetic Shield Div
Perfection Mica Co
750 North Thomas Drive
Bensenville, Ill. 60106
(312)766-7800

MuShield Co
121 Madison St. PO Box W
Malden, MA  02148-6890
(617)321-4410

--henry schaffer  n c state univ