ARMY TM 9-6115-604-12 NAVY NAVFAC P-8-33-12 Table 3-4.  Freezing Points, Composition, and Specific Gravities of Military Antifreeze PINTS (LITERS) OF LOWEST INHIBITED ETHYLENE GLYCOL EXPECTED GLYCOL PER COOLANT SOLUTION AMBIENT GALLONS (LITERS) OF SPECIFIC GRAVITY TEMPERATURE COOLANT ¹ COMPOUND ANTIFREEZE AT °F   (°C) PINTS  LITERS ARCTIC ², ³ 68F (20C) +20   (-6 7) 1 1/2 (0.7098) Issued full strength and 1.022 ready mixed for 0 to 65°F +10   (-12 2) 2   (0 9464) (-17 8 to 18 3C) tempera- 1.036 tures for both Initial Installa- 0 (-17 8) 2 3/4   (1 3013) tions and replenishment of losses 1.047 -10   (-23 3) 3 1/4   (1 5379) 1 055 -20   (-28 9) 3 1/2   (1 6562) 1.062 -30   (-34 4) 4   (1 6562) 1 067 -40   (-40 0) 4 1/4   (1 8927) 1.073 -50   (-45 6) ARCTIC ANTI-FREEZE DO NOT DILUTE WITH PREFERRED WATER OR ANY OTHER -60   (-51.1) SUBSTANCE -75   (-59.4) 1. Maximum protection is obtained at 60 percent volume (4 8 pints (2 27 liters)) of ethylene glycol per gallon (3.785 liters) of solution. 2. Military Specification MIL-A-11755 Arctic type, nonvolative antifreeze compound Is Intended for use In the cooling system of liquid-cooled internal combustion engines.  It is used for protection against freezing primarily in Arctic regions where the ambient temperature is close to -40F (-40C) for extended periods or drops below, to as low as - 75°F (-59.40C). 3. Fasten a tag near the radiator filler cap indicating the type antifreeze. The test kit indicates DCA concentration by measuring nitrite content of a coolant sample, which provides cylinder liner  cavitation  protection.    Use  of  an  antifreeze  may  contribute  to  nitrite  content.    However,  most  nitrite  protection  is obtained  from  the  DCA  Inhibitor  present  In  the  disposable  water  filter  elements  (Figure  3-3)  or  in  a  pretreated  coolant supply.  In general, a good nitrite reading indicates that the combined inhibitor packages contained in the antifreeze (If used) and in the DCA are sufficient to ensure complete cooling system protection.  Use coolant -rest Kit as follows: (a)   Drain sample of engine coolant and dilute one part with nine parts tap water Mix solution thoroughly. (b)   Fill the mixing vial supplied with kit to the 10 mil scribe mark.  Add two or three drops of nitrite Indicator solution B and swirl to attain a uniform red color. (c)   Add one drop of nitrite test solution A to the vial, being careful to hold the dispenser provided in a vertical position Swirl to mix. (d)   Continue adding drops of nitrite test solution A.  Keep count of the number of drops added and swirl vial between each drop until the liquid color changes from red to a pale grey, green, or blue. (e)   Record the number of drops required for color change and consult Table 3-5 for coolant condition and recommended maintenance. 3-46