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  1. ohelbig

    O-ring E515-80 compatibility to N2H4

    Thanks all for the swift answers! @flexibox: Yes the Parker Handbook recommends E540-80, but as btrueblood pointed out its a newer compound and I would like to stick to our flight heritage. I actually phoned the Parker guys in Lexington and they said both are suitable for Hydrazine, "not much...
  2. ohelbig

    O-ring E515-80 compatibility to N2H4

    Hi, I'm looking for any kind of evidence, that o-rings made from Parker EPDM compound E515-80 (formerly known as EPR 515-80) can be used as sealing barriers in a space propulsion valve. The operating media is Hydrazine (N2H4). Eckart Schmidt says in his Hydrazine bible, that it is "one of the...

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