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Photographer's Note

The abbreviations ADF (Aircraft Deicing Fluid) or AAF (Aircraft Anti-icing Fluid) are commonly used for de-icing fluids used in both commercial and general aviation.The main component of deicing fluid is a freezing point depressant (FPD), usually propylene glycol or ethylene glycol.
Other ingredients vary depending on the manufacturer, but the exact composition of a particular brand of fluid is generally held as confidential proprietary information.

Based on chemical analysis, the U.S. Environmental Protection Agency has identified five main classes of additives widely used among manufacturers:

Benzotriazole and methyl-substituted benzotriazole, used as corrosion inhibitor/flame retardants to reduce flammability resulting from the corrosion of metal components carrying a direct current.
Alkylphenol and alkylphenol ethoxylates, nonionic surfactants used to reduce surface tension.
Triethanolamine, used as a pH buffer.
High molecular weight, nonlinear polymers, used to increase viscoelasticity.
Colored dyes, such as azo, xanthene, triphenyl methane, and anthroquinone, used to aid in identification.

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Additional Photos by Alex Fan Moniz (LondonBoy) Gold Star Critiquer/Gold Note Writer [C: 85 W: 0 N: 392] (1950)
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