From: jfindley@cinci.nospam.rr.com   
      
   In article ,   
   jfindley@cinci.nospam.rr.com says...   
   >   
   > In article ,   
   > jfmezei.spamnot@vaxination.ca says...   
   > >   
   > > On 2021-07-21 17:29, Jeff Findley wrote:   
   > >   
   > > > US.  The Titan II missile, Titan II launch vehicle, Titan III launch   
   > > > vehicle, and Titan IV launch vehicle all used hypergolic propellants in   
   > > > their liquid fueled stages.  But the US doesn't use them anymore.   
   > >   
   > > Looking at how Soyuz had been certified for max 6 months, do the   
   > > hypergolics have a "best before" sticker on the gallons that you buy at   
   > > tye local hardware store?  If you're using them for missile that remain   
   > > idle all their life, just curiious how they handle this.  De-fuel   
   > > missile and put in new hypergolics every 6 months?   
   >   
   > Soyuz doesn't use hypergolic propellants.  It uses nearly pure hydrogen   
   > peroxide mono-propellant.  Nearly pure hydrogen peroxide will decompose   
   > over time, which is why Soyuz is limited to about six months in space.   
      
   I should have been more clear.  The six month endurance of Soyuz is   
   limited by the hydrogen peroxide propellant for the reaction control   
   system of the DM (descent module).  The SM (service module) uses   
   hypergolic propellants.   
      
   Jeff   
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