Type 2 de-icing/anti-icing fluids have a significantly longer holdover period compared to which type of fluids?

Type 2 de-icing/anti-icing fluids are specifically designed to be used in conditions where ice and snow are present. They have a longer holdover period compared to Type 1 fluids, which are primarily designed for de-icing and not for anti-icing. Type 1 fluids are heated and typically used for rapid de-icing, but they do not provide prolonged protection against ice and snow accumulation once they cool down, leading to a significantly shorter holdover period.

In contrast, Type 2 fluids function effectively at lower temperatures and are formulated to remain stable on the aircraft's surface for a longer time, providing extended resistance to the formation of ice or snow. This is essential for ensuring safe operations in varying weather conditions.

Type 3 and Type 4 fluids, while also designed for anti-icing, have specific operational contexts and limitations that do not directly compare to the holdover advantages of Type 2 fluids. Type zero fluids are not a standard designation within de-icing/anti-icing classifications relevant to this question.