Nature, 28 August 2013
http://www.nature.com/news/green-fuels-blast-off-1.13603
Called LMP-103S, the Swedish fuel is based on ammonium dinitramide, a high-energy salt. It made its debut in 2010 aboard PRISMA, a Swedish satellite meant to demonstrate the fuel in precision flying with small thrusters. For comparison, the mission also carried hydrazine. It took 3 people 7 days to load the green propellant on the launch pad, and 5 people and 14 days to load the hydrazine.
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