What is the minimum glycol content required for Type 2 deicing/anti-icing fluid?

The minimum glycol content required for Type 2 deicing/anti-icing fluid is 50%. This specific concentration is crucial because it balances effective deicing capabilities with viscosity, allowing for sufficient performance in preventing ice formation on aircraft surfaces during winter operations. Type 2 fluids are designed for situations where aircraft are parked for moderate durations prior to takeoff and are intended to provide a level of anti-ice protection.

Using a glycol concentration of 50% ensures that the fluid has the necessary properties to adhere to the aircraft's surfaces while providing adequate protection against ice accumulation. Lower concentrations may not provide sufficient protection, leading to the risk of ice contamination.

Higher glycol concentrations, like 80% or 100%, could potentially be used but are not necessary and may lead to other operational inefficiencies or increased costs. Therefore, 50% is an industry-standard minimum that provides a solid compromise between performance and practicality.