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From: jer@peora.UUCP (J. Eric Roskos)
Newsgroups: net.columbia
Subject: Re: Columbia's Tiled Damaged by Rain
Message-ID: <1521@peora.UUCP>
Date: Fri, 23-Aug-85 21:51:03 EDT
Article-I.D.: peora.1521
Posted: Fri Aug 23 21:51:03 1985
Date-Received: Sun, 25-Aug-85 00:27:31 EDT
References: <4010@alice.UUCP> <199@mot.UUCP> <521@calmasd.UUCP> <47@darwin.UUCP> <1400@cbosgd.UUCP> <542@calmasd.UUCP> <759@asgb.UUCP>
Organization: Perkin-Elmer SDC, Orlando, Fl.
Lines: 26

> It is interesting to note that eventhough the raw (meaning uncoated...the
> tiles have been "cooked" several times by the time they are ready for the
> final coating processes) tile material may be rubbed off like powder with
> the finger, they required diamond coated end mills to machine them.  Yes...

This sounds like ordinary ceramic glaze, is that the case?  (I.e., ceramic
glazes before you fire them are made up of finely powdered glass, mixed with
a binder and suspended in water; they go on with a texture sort of like
chalk, but then when fired the glass melts together into a solid surface.)
I'm not entirely sure what is meant here; are the tiles like this:

	================== <-powdery before, hard after firing
	oooooooooooooooooo
	oooooooooooooooooo <-polyurethane foam
	oooooooooooooooooo
	****************** <-bonding site ref'd later in article

or is it the polyurethane-foam-like material that rubs off before firing but
is hard after?
-- 
Shyy-Anzr:  J. Eric Roskos
UUCP:       ..!{decvax,ucbvax,ihnp4}!vax135!petsd!peora!jer
US Mail:    MS 795; Perkin-Elmer SDC;
	    2486 Sand Lake Road, Orlando, FL 32809-7642

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