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Per NASA document: https://history.nasa.gov/conghand/propelnt.htm

Super high-energy bipropellants_______________________ 300 to 385, ISP
Fluorine-Hydrogen
Fluorine-Ammonia
Ozone-Hydrogen
Fluorine-Diborane

But Fl is very difficult to handle. Doing a combustion experiment back in mid 60s, I had a regulator burn up that was apparently not properly passivated that released a whole bottle of flourine to the atmosphere. No injuries, luckily.

From the historical NASA document Space Handbook: Astronautics and Its Applications, by Robert W. Buchheim (1959).

Super high-energy bipropellants

300 to 385, ISP

• Fluorine-Hydrogen
• Fluorine-Ammonia
• Ozone-Hydrogen
• Fluorine-Diborane

But fluorine is very difficult to handle. Doing a combustion experiment back in the mid 1960s, I had a regulator burn up that was apparently not properly passivated that released a whole bottle of fluorine to the atmosphere. No injuries, luckily.

Per NASA document: https://history.nasa.gov/conghand/propelnt.htm

Super high-energy bipropellants_______________________ 300 to 385, ISP
Fluorine-Hydrogen
Fluorine-Ammonia
Ozone-Hydrogen
Fluorine-Diborane

But Fl is very difficult to handle. Doing a combustion experiment back in mid 60s, I had a regulator burn up that was apparently not properly passivated that released a whole bottle of flourine to the atmosphere. No injuries, luckily. tom kosvic

Per NASA document: https://history.nasa.gov/conghand/propelnt.htm

Super high-energy bipropellants_______________________ 300 to 385, ISP
Fluorine-Hydrogen
Fluorine-Ammonia
Ozone-Hydrogen
Fluorine-Diborane

But Fl is very difficult to handle. Doing a combustion experiment back in mid 60s, I had a regulator burn up that was apparently not properly passivated that released a whole bottle of flourine to the atmosphere. No injuries, luckily.

Per NASA document: https://history.nasa.gov/conghand/propelnt.htm

Super high-energy bipropellants_______________________ 300 to 385, ISP Fluorine-Hydrogen Fluorine-Ammonia Ozone-Hydrogen Fluorine-Diborane

But Fl is very difficult to handle. Doing a combustion experiment back in mid 60s, I had a regulator burn up that was apparently not properly passivated that released a whole bottle of flourine to the atmosphere. No injuries, luckily. tom kosvic

Per NASA document: https://history.nasa.gov/conghand/propelnt.htm

Super high-energy bipropellants_______________________ 300 to 385, ISP 
Fluorine-Hydrogen 
Fluorine-Ammonia 
Ozone-Hydrogen 
Fluorine-Diborane

But Fl is very difficult to handle. Doing a combustion experiment back in mid 60s, I had a regulator burn up that was apparently not properly passivated that released a whole bottle of flourine to the atmosphere. No injuries, luckily. tom kosvic