Coolanol 25R Replacement for Military Aircraft Radar Cooling Systems

Silicate-ester-based fluids have found extensive use as dielectric coolants in military applications, such as aircraft radar systems. However, the ease of hydrolysis of these fluids results in the formation of a flammable alcohol and, in the more advanced stages, a gelatinous precipitate that causes component malfunctions. While a PAO coolant meets current requirements, advanced systems require improved performance in heat flux removal rate, heat capacity, thermal and hydrolytic stability, and low wear in pumps. To meet these requirements, METSS will focus on combining hydrolytically stable basestocks and additives to produce a new class of dielectric fluids. Under the Phase I program, METSS investigated the technical feasibility of using a variety of basestocks and basestock combinations to provide superior performance. As a result, METSS has identified materials that could serve as direct replacement fluids for existing coolants. Under the proposed Phase II program, METSS will optimize the performance of these new materials through further investigation of basestock combinations and the use of performance enhancing additives. The proposed program will also address material compatibility, safety, environmental impact and use costs. This approach will utilize existing commercial technology, solicit commercial support and provide an effective plan to supply the product to the AF.