MIL-DTL-87173B(USAF)
3.2.3 Fuel system icing inhibitor. Fuel system icing inhibitor shall be used only at the request of the
User. If requested by the User, the inhibitor shall conform to MIL-I-85470.
TABLE I. Chemical and physical requirements and test methods.
Priming
ASTM
Fluid
Standards
Property
Minimum
Maximum
4
Color, Saybolt
+25
D156 , D6045
1
Chemical composition, wt, percent
methylcyclohexane
10.0
15.0
exo-
83.5
90.0
tetrahydrodi(cyclopentadiene)
1.5
other hydrocarbons
4
Flash point, °C (°F)
16 (60)
27 (80)
D93 , D3828
D1298, D4052 4
Specific gravity, (60/60F)
0.900
0.930
Freezing point, °C (°F)
-54 (-65)
D2386
Viscosity, centistokes at -54 °C
40
D445
D240, D2382
Net heat of combustion
42.1
MJ/kg (Btu/lb)
(18,100)
D3241 2
Thermal stability change in
pressure drop, mm Hg
10
heater tube deposit visual rating
< Code 3
Existent gum, mg/100 mL
5
D381
Particulate matter, mg/liter
1.0
D2276, D5452
D5006 3
0.10
0.15
Fuel system icing inhibitor, volume
percent
1
Test shall be performed using appendix A or appendix C.
2
See 4.5.3 for ASTM D3241 test conditions and test limits.
3
Use proper scale of refractometer.
4
Referee Test Method
3.3 Performance. The priming fluid shall satisfy the performance requirements as specified in the tests
of section 4, herein.
3.4 Workmanship. The priming fluid shall be visually free from undissolved water, sediment, or
suspended matter and shall be clean and bright at the ambient temperature or at 21°C (70 °F), whichever
is higher.
4
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