HAN (hydroxylammonium nitrate)
HAN-based monopropellant thruster test at Primex Aerospace. Credit: Primex Aerospace / Aerojet.
HAN (hydroxylammonium nitrate) is a relatively new, synthetic, rocket fuel with the chemical formula NH2OH+NO3. HAN has the potential to be used both as a liquid monopropellant and an ingredient in solid propellants. It has the advantage of being more environmentally friendly than the toxic hydrazine presently used in thrusters on most spacecraft,