Which statement best describes Type II anti-icing fluid?

• A. Orange and thin, used for rapid de-icing.
• B. Clear/white fluid that contains a polymer thickening agent and remains in place until about 100 knots.
• C. Green fluid with long holdover time.
• D. Yellow fluid designed for heat transfer surfaces.

Answer: (B)

Type II anti-icing fluid is formulated to cling to the aircraft surface longer than a simple de-icing solution, giving a longer holdover time as the aircraft transitions to takeoff. The defining feature is a polymer thickening agent that makes the fluid more viscous, allowing it to stay in place through initial wind and motion. That’s why the description of a clear/white fluid containing a polymer thickening agent and remaining in place until about 100 knots best matches Type II. By contrast, the orange, thin fluid describes Type I, meant for rapid de-icing; other fluids may be green and associated with longer holdover times (often Type IV) or colored for heat-transfer purposes, which are not characteristics of Type II.