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From: ark@alice.UucP (Andrew Koenig)
Newsgroups: net.audio
Subject: Re: Deterioration of Compact Discs
Message-ID: <4437@alice.UUCP>
Date: Mon, 14-Oct-85 21:43:19 EDT
Article-I.D.: alice.4437
Posted: Mon Oct 14 21:43:19 1985
Date-Received: Tue, 15-Oct-85 20:37:20 EDT
References: <391@ccice6.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 16

>	What is the material used for the protective coating;
>	how do its physical and optical properties change over
>	time in a "normal" environment?

>	Are there (non-obvious) storage conditions which
>	would hasten deterioration, either physical or optical?

>	Are there methods of storage which would best prevent
>	possible deterioration? 

I think they use polycarbonate plastic.  This is the stuff that is
used, among other things, for windshields of light airplanes and
food processor work bowls.  It is one of the toughest plastics
around at any reasonable cost and should last a very long time indeed.
The only thing I would think might cause trouble over the long
term is UV radiation.  In other words, don't leave them out in the sun.