TM 9-2320-209-20-3-1 Table 1-3. Guide for Preparation of Antifreeze Solution Ethylene-glycol (-60°F) inhibited (O-A-548, type 1) Lowest expected ambient Pints per gallon Arctic grade anti- temperature of coolant capacity Specific gravity freeze (- 90°F) (°F) (Notes 1, 2) (68°F) MIL-A-11755 +20 0.750 1.022 Freezing point of -90°F +10 1.000 1.036 Issued ready for use and 0 1.375 1.047 must not be mixed with -l0 1.625 1.055 any other liquid -20 1.750 1.062 -30 2.000 1.067 -40 2.125 1.073 -50 2.250 -60 2.375 Below -60 Use arctic grade antifreeze (–90°F) NOTES : 1. Includes heaters. 2. Proportions are in terms of ethylene-glycol per gallon and not pints of ethylene- glycol added to each gallon of water. For example, at -30°F a gallon of coolant contains two pints of ethylene-glycol and six pints of water (2 pints + 6 pints = 8 pints = 1 gallon). 1-12