Eutectic KNO3-NaNO3-Sorbitol propellant


  • Put 5.4g KNO3 and 4.6g NaNO3 into a beaker (Borosilicate glass!)
  • Mix the two substances
  • Put the beaker with mixture on laboratory heating plate with temperature sensor and thermostat, insert temperature sensor into salt mixture
  • Pre-set the temperature to 220ºC
  • Heat till 220ºC are reached and salt mixture is liquefied (the theoretical melting point of the eutectic mixture is 218ºC but my mixture was already completely liquefied at 180ºC, maybe due to some impurities)
  • Add slowly 5.4g sorbitol, stir with glass rod till the sorbitol is molten and ‘dissolved’ completely in the salt bath. 
  • Pour the solution on a coated baking paper. Be careful, it has a viscosity nearly like water!
  • Let it cool down for 10 minutes
  • Ignite the mixture with a butane torch. The mixture is very difficult to ignite due to its high heat of fusion (nearly like thermite)

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