Mobil COOLANOL 25R Heat Transfer Fluid, 1 gal | ExxonMobil Corp

COOLANOL silicate ester synthetic dielectric heat transfer fluids are designed to meet the special needs of sensitive electronic components and environmental control systems in aircraft, missiles and spacecraft. The proven quality and reliability of COOLANOL is an important additional safeguard against costly and potentially catastrophic failure of critical airborne electrical equipment. COOLANOL is specifically intended for liquid circulating systems (dynamic liquid phase) found in high-density electronic packages in aerospace and military applications. Such systems are in wide use because of their excellent heat transfer efficiency. COOLANOL should not be used in vaporizing (boiling liquid) systems. COOLANOL meets MIL-C-47220B. Though inactive, it distinguishes five fluid types; I through IV. Type I is sold as COOLANOL35R, Type II is COOLANOL45R, Type III is COOLANOL OS59, and Type IV is COOLANOL 25R. COOLANOL20 is the lowest viscosity, but does not meet the Mil-Spec. COOLANOL 25 meets Boeing (McDonnell-Douglas) MMS-652, Rev. A., and Grumman GM 6003A, Amendment-No 1 for Type 1, and Hughes Aircraft HMS 20-1458 Rev E, and Northrop MS-138, Rev A.