MIL-PRF-23699G
4.4 Test methods. All tests shall be performed in accordance with tables I, II, and III.
4.4.1 Low temperature viscosity. For the purposes of determining the percent viscosity
change, the initial viscosity shall be determined 35 ±1 minutes after the viscometer is placed in
the bath maintained at -40 ±1.05 °C and again at 72 hours ±5 minutes after completion of initial
viscosity.
4.4.2 Evaporation loss. Bath temperature shall be maintained at 204 ±1°C, for the 6.5 hour
test period. Air temperature shall be maintained at 204 ±1°C, using a pre-heater, if necessary.
4.4.3 Rubber compatibility. Standard elastomer stocks shall conform to SAE AMS3217/1,
SAE AMS3217/4, SAE AMS3217/5, SAE AMS7276, and SAE AMS R 83485.
4.4.3.1 Rubber swell. SAE AMS3217/1 and SAE AMS3217/4 shall be tested in accordance
with FED-STD-791, method 3604. Standard Silicone Rubber shall be tested in accordance with
FED-STD-791, method 3433.
4.4.4 Expanded rubber compatibility. The expanded rubber compatibility tests performed
using ASTM D471 and SAE ARP6179 test methods are only required for the EE class.
4.4.4.1 SAE AMS3217/5 rubber compatibility. ASTM D471 modified procedure uses eight
specimens, four cut using ASTM Die C (for tensile strength, elongation, and hardness properties)
and four cut to 50 by 25 mm (for swell property). All eight specimens shall be suspended using
stainless steel hangers submerged in 900 mL of oil in a sealed quart glass jar (a screw on lid
lined with aluminum foil may be used). Aging shall be performed in an oven as stated in
ASTM D471 with the single glass jar replacing the multiple test tube arrangement. Eight control
specimens shall be used for baseline tensile strength, elongation, and hardness measurements.
4.4.4.2 SAE AMS7276 rubber compatibility. SAE AMS7276 shall be tested in duplicate
with the EE candidate oil along with a single Reference Oil 300 (RO300 as in accordance with
SAE AMS 3085) test and a single MIL-PRF-23699 STD class test; thus, a total of four cell
assemblies per SAE ARP6179 are needed for one EE class qualification test. The results are
invalid if either the RO300 or the STD tests fail any of their respective elastomer property limits.
The limits for the RO300 control oil for suspended testing are tensile strength loss: 30 percent
minimum, swell increase: 22 percent minimum, and hardness loss: 24 percent minimum. The
limits for the STD control oil for suspended testing are tensile strength loss: 25 percent
maximum, swell increase: 17 percent maximum, and hardness loss: 20 percent maximum. The
limits for the compressed tests for RO300 and STD control oils are a compression set loss of 45
percent minimum and 35 percent maximum, respectively. The combined average of the
duplicate tests for the candidate EE oil shall be reported along with the average of the RO300
and STD class oil tests for each of the listed properties. A single batch of SAE AMS7276
material has been set aside for this testing at the qualification laboratory as suggested in
SAE ARP6179.
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