Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site peora.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!vax135!petsd!peora!jer 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 "Zbba Cvr!"