Does an additive exist to decrease the freezing point of jet fuel? I have found an additive that decrease the freezing point generated by drops of water (appears between 0 and -10°C), but I'm needing to reduce the freezing of the fuel (-45°C).


2 Answers 2


There is an additive known as a Fuel System Icing Inhibitor (FSII), it is designed to be mixed with the fuel of non-fuel heated aircraft i.e military. Mixed in at about 0.10-0.15% is optimal to reduce the formation of ice crystals, which will stop it freezing.

Source: http://www.advancepetro.com/fsii.htm

Alternatively, Jet A-1 fuel has a freezing point of -47°C, which is below your threshold and could be useful. Or if Jet A-1 is unavailable you could try Jet B which has a lower freezing point of -60°C, but is more dangerous to handle, and is less prevalent and hence unavailable at many locations.

Sources: http://webarchive.nationalarchives.gov.uk/20100814170713/http%3A//www.dstan.mod.uk/standards/defstans/91/091/00000600.pdf


  • $\begingroup$ Welcome to Av.SE! $\endgroup$
    – Ralph J
    Oct 13, 2018 at 17:40
  • $\begingroup$ anti icing is clearly a different thing. more to prevent the water content from icing, not prevent the fuel content from freezing. $\endgroup$ Oct 13, 2018 at 20:47
  • $\begingroup$ It was also mentioned somewhere around here that some newer engines are not allowed to be used with Jet-B. $\endgroup$
    – Jan Hudec
    Oct 14, 2018 at 9:14
  • $\begingroup$ Welcome to Av.SE. There is also JP-4 that can go down to -57°C. JP-8 is Jet A-1 plus more additives that may have better availability in the US than Jet A-1. $\endgroup$
    – OSUZorba
    Oct 15, 2018 at 1:52

Question to Wehrner von Braun: "Why did you name it Saturn?". Answer: "It was the one after Jupiter!"

The lower freezing jet fuel is Jet B.

Jet fuel (kerosene) is taken from a higher boiling fraction than "naphtha" (gasoline) when refining crude oil. A mixture of kerosene and naphtha will lower the freezing point. This is how Jet B is made.

Before doing this in your garage, make sure there is no water in the mix, as frozen ice crystals will be present at much higher temperatures.

  • 1
    $\begingroup$ Also, don't do this in your garage, as Jet B burns/explodes much more enthusiastically than Jet A-1, and at much lower temperatures. $\endgroup$
    – Vikki
    Sep 7, 2019 at 0:26

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