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From: philhowr@unix.cie.rpi.edu (Bob Philhower)
Newsgroups: sci.space.shuttle
Subject: Re:  Hubble Space Telescope
Keywords: clean room HST
Message-ID: <6166@rpi.edu>
Date: 21 Jul 89 18:40:41 GMT
References: <351@aeras.UUCP> <2983@helios.ee.lbl.gov> <23692@prls.UUCP> <1566@bucket.UUCP> <7310@bunny.GTE.COM>
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Reply-To: philhowr@unix.cie.rpi.edu (Bob Philhower)
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In article <7310@bunny.GTE.COM> s914@GTE.COM (Lawrence Bilker) writes:
>
>I read somewhere that it is a class 10,000 clean room.  Which is even more
>expensive than a class 100 clean room!
>

In case this wasn't a joke, the "class" of a clean room refers to the amount
of particles in the air inside.  The number is the nominal count of particles
1 micron and larger in a 1 cubic-meter of space.  Thus a class 100 clean room
is 100 times CLEANER than a class 10,000 clean room.  (Normal air is somewhere
around class 1 million or so.)

Given the size of HST, I would be surprised if they can actually maintain
better than class 10,000 around it.

--
Robert Philhower	Rensselaer Center for Integrated Electronics
  E-Mail: philhowr@unix.cie.rpi.edu
  USMail: CII 6111 / Rensselaer Polytechnic Institute / Troy, NY  12180 / USA