MIL-PRF-14107D
No. 3603 to determine swelling of the specimen, except test each
rubber specimen in a separate tube.
4.3.2.3 Flash point. The flash point of the oil shall be determined
in accordance with ASTM D92. A flash point at any temperature below
305oF (162.7oC) shall be cause for rejection.
4.3.2.4 Pour point. The pour point of the oil shall be determined in
accordance with ASTM D97. Oil that does not pour at -75oF (59.4oC) or
lower shall be cause for rejection.
4.3.2.5 Neutralization number. The neutralization number maximum
point shall be determined in accordance with ASTM D974. A
neutralization number more than 1 shall be cause for rejection.
4.3.2.6 Viscosity. The viscosity of the oil shall be determined in
accordance with ASTM D445. Viscosity outside the range specified in
3.3.6 shall be cause for rejection.
4.3.2.7 Precipitation. The precipitation number maximum point shall
be determined in accordance with ASTM D91. Precipitation number of
the insoluble materials in excess of 0.05 ml shall be cause for
rejection.
4.3.2.8 Evaporation loss. The evaporation loss shall be conducted in
accordance with ASTM D972. This test shall be conducted at 210oF
(99oC). A loss of more than 10 percent of the volume of the test
sample shall be cause for rejection.
4.3.2.9 Lubricating durability. The lubricating performance of the
oil shall be determined on a 7.62 mm M60 machine gun, air cooled,
link belt fed, and gas operated. The gun shall be disassembled and
cleaned of all traces of lubricant and dirt by washing with a
volatile mineral spirits, such as P-D-680 dry cleaning solvent or TT-
N-95 naphtha. After complete removal of the solvent from all surfaces
of the gun by use of a water free air hose or by air drying, all
components except the barrel shall be coated with the test lubricant
by brushing. The barrel, both in the bore and the external surface,
shall be coated lightly with the lubricant using a clean, lint free
patch. The patch shall be dipped in the oil and then squeezed to
remove excess oil. The gun shall then be reassembled and bench tested
for operational use. The gun shall be test fired for 20 rounds in an
ambient temperature of 50o to 100oF (10o to 37.8oC) and the cyclic rate
of fire recorded. Upon satisfactory completion of the ambient
temperature test, the gun shall be disassembled, cleaned and re-
lubricated for the next phase of the test. With the bolt in the
rearward (firing) position and the selector lever set on "safe" the
weapon shall be loaded with a 50 round belt of ammunition and
conditioned at -70o + 5oF (-56.6o + 2oC) for 16 + 1 hours. The weapon
shall then be placed in the firing fixture, the selector lever set on
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