What is the main characteristic of Type I de-icing fluid?

The main characteristic of Type I de-icing fluid is that it is heated and has a low viscosity, which makes it effective for ice removal. This type of fluid is designed to quickly melt ice and snow upon application, ensuring that aircraft surfaces are cleared of contaminants that could impact safety and performance. The heat enhances its melting capabilities, while its low viscosity allows it to flow and spread easily across the aircraft surface, effectively penetrating and removing ice.

In contrast, other types of de-icing fluids have different purposes. For example, Type IV fluid is typically thicker and designed to provide anti-icing protection, rather than immediate de-icing. It is not primarily formulated to be heated for effective ice removal as Type I is. The option mentioning anti-corrosive agents addresses a feature found in some de-icing fluids, but it does not distinguish Type I since not only Type I but also other types may include such additives.