Fuel system icing inhibitor  From Wikipedia, the free
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Jump to: navigation, search  Fuel system icing inhibitor (FSII)
is an additive to aviation fuels that prevents the formation of
ice in fuel lines. FSII is sometimes referred to by the
registered, genericized trademark Prist. Jet fuel can contain a
small amount of dissolved water that does not appear in droplet
form. As an aircraft gains altitude, the temperature drops and
Jet fuel's capacity to hold water is diminished. Dissolved water
can separate out and could become a serious problem if it
freezes in fuel lines or filters, blocking the flow of fuel and
shutting down an engine.  Chemical composition[edit]
Chemically, FSII is an almost pure (99.9%) ethylene glycol
monomethyl ether (EGMME, 2-methoxy ethanol, APISOLVE 76, CAS
number 109-86-4), or glycol monomethyl ether since 1994
diethylene glycol monomethyl ether (DEGMME, 2- (2-methoxy
ethoxy) ethanol, APITOL 120, methyl carbitol, CAS number 11