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From: serre@tramp.Colorado.EDU (SERRE GLENN)
Newsgroups: sci.space
Subject: Re: Shuttle fuel reserves
Summary: The usual hydrazine fuel is "Aerozine-50"
Message-ID: <15810@boulder.Colorado.EDU>
Date: 18 Jan 90 16:10:07 GMT
References: <1990Jan17.233050.3044@helios.physics.utoronto.ca> <1990Jan18.060556.2168@utzoo.uucp>
Sender: news@boulder.Colorado.EDU
Reply-To: serre@tramp.Colorado.EDU (SERRE GLENN)
Organization: University of Colorado, Boulder
Lines: 9

The type of hydrazine used by most (many?) rockets 
(the ones that use hydrazine, at least) is called "Aerozine-50", 
(this might be a TRW trademark) which is
composed of 50% UDMH (Unsymmetrical DiMethyl Hydrazine) and 50% "regular"
hydrazine (N2H4).  This mix is used because it is more stable and has a larger
liquid temperature range (I think).  

--Glenn Serre
serre@tramp.colorado.edu