What should not be used in non-precipitation conditions to avoid higher freezing points?

Pure ethylene glycol is an effective deicing agent due to its ability to lower the freezing point of water; however, when used in non-precipitation conditions, it can lead to higher freezing points than desired. In such situations, diluted versions or other alternatives are more appropriate since they have a lower viscosity and are less likely to become re-frozen on aircraft surfaces.

Using diluted ethylene glycol, heated propylene glycol, or green deicing fluid in non-precipitation conditions offers better performance by ensuring that the deicing fluid remains in a usable state and does not freeze again quickly, which could create safety hazards. These options are designed to provide optimal conditions for preventing ice formation without risking higher freezing points that might compromise the effectiveness of the deicing process. Therefore, pure ethylene glycol is not recommended for non-precipitation applications due to its tendency to create higher freezing points.