MIL-PRF-23699G
4.4.4.3 SAE AMS R 83485 Rubber Compatibility. SAE AMS R 83485 shall be tested in
duplicate with the EE candidate oil per SAE ARP6179. The combined average of the duplicate
tests for the candidate EE oil shall be reported.
4.4.5 Compatibility. The compatibility test shall be performed in accordance with
FED-STD-791, method 3403 with the following exception: petroleum ether, with a boiling
range of 30 to 60 °C, n-heptane, or hexane, shall be used in place of 1,1,1-trichloroethane
(O-T-620). Upon completion of the l68 hour oven period, the test flasks shall be stored in the
dark at room temperature 24 ±5 °C for 21 days before visual inspection for turbidity. Sediment
shall be determined in accordance with FED-STD-791, method 3010. If the amount of sediment
collected after the exposure period is greater than the limit specified in table I additional testing
may be performed on the mixture to determine that its performance meets the requirements of
this specification. The additional testing may include all of the tests specified in this
specification. Referee lubricating oils shall consist of selected oils qualified under this
specification, MIL-PRF-7808 and DOD-PRF-85734.
4.4.6 Low temperature storage. Three one quart samples of oil shall be stored in a cold
chamber maintained at -18 ±2.5 °C for 6 weeks. At the end of the storage period, the oil shall be
visually inspected for evidence of crystallization, additive separation, and gelling.
4.4.7 Stability testing of first production run. Five cases of one quart containers (120
containers) from the first production batch of the tentatively qualified oil procured for U.S.
government use (original qualification, reblend, or rebrand) shall be stored at a temperature of
not lower than -40 °C and not greater than 60 °C for l2 months. At the end of the l2 month
storage period the samples shall be examined for conformance to the inspection requirements of
conformance inspection (see 4.3).
4.4.7.1 Tentative qualification approval. Tentative qualification approval is given to
products meeting the qualification inspection (see 4.2). Final qualification approval shall be
awarded upon successful completion of the stability testing of first production run. Failure to
pass this test shall be cause for withdrawal of approval.
4.4.8 Thermal stability and corrosivity. Post test oil viscosity sample shall be compared
with viscosity of new oil samples tested at 40 °C. Post test oil total acid number is compared
to the total acid number of the new oil sample. The viscosity shall be determined in accordance
with ASTM D445. The total acid number shall be determined in accordance with
SAE ARP5088.
4.4.9 Sediment. Sediment measurement may be made using a silver membrane filter. If the
total sediment does not exceed 1 mg/l, the ash content does not need to be determined.
4.4.10 Shear stability. Use an irradiation period of 30 minutes on a 30 mL oil sample at a
power setting which causes 11.5 ±0.5 percent viscosity loss to a 30 mL sample of ASTM
Reference Fluid, when irradiated for five minutes. ASTM Reference Fluid A is a petroleum oil
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