MIL-DTL-3918B
4.4.2. Oil test methods. The tests listed in Table IV shall be performed in accordance
with the applicable method.
TABLE IV. Test methods for oil properties.
Requirement
FED-STD-791
ASTM
Paragraph
Method Title
Paragraph
Method No.
Method No.
herein
3.2
Viscosity
D445
3.3
Acid Number
D974
3.4
Evaporation Loss
D972
Copper Corrosion by Petroleum
3.5
D130
Products
Corrosiveness and Oxidation
3.6
Stability of Light Oils (Metal
5308
Strip)
3.7
Spreading of Oil
4.4.2.1
3.8
Low Temperature Stability
3459
3.9
Workmanship
4.4.2.2
4.4.2.1 Spreading on metal.
4.4.2.1.1 Preparation of metal surface. A steel surface with a minimum area of 0.25
square inches shall be polished with metallographic papers Nos. 0, 2/0, 3/0, and 4/0 in that order
and finally with Fisher's "Gamal" or equivalent polishing alumina on a wheel covered with
heavy broadcloth. After the surface has been polished, it shall be washed with water, swabbed
with wet absorbent cotton, and rinsed thoroughly with distilled water. The surface shall then be
rinsed with reagent grade 99 percent methanol and dried for 15 minutes in an oven at 221°F
(105°C). The specimen shall then be allowed to cool to room temperature in a desiccator.
4.4.2.1.2 Procedure. Three drops of oil shall be placed on the metal surface with a clean
platinum wire. The drops shall be between 1.0 and 2.0 mm in diameter. (A platinum wire 0.005
inches in diameter is suitable for depositing a drop this size.) After the wire has been recleaned,
two drops of reagent grade orthotricresyl phosphate shall be placed on the metal surface in a
similar manner. The metal and the drops shall be covered to keep out dust and allowed to stand
for 15 minutes. The diameters of each of the five drops shall be measured with a measuring
apparatus having an accuracy of one percent and the values recorded. The metal shall be
carefully transferred to an air bath maintained at 113 ± 3°F (45 ± 2°C) and allowed to remain for
24 hours. The drops shall be measured. If both the oil and the orthotricresyl phosphate appear to
be spreading, the test should be repeated on a freshly prepared surface. If no evidence of
spreading is observed the test is continued for an additional 144 hours (6 days). After the 168
hours (7days), the diameter of the oil drops is measured and any increase in diameter calculated.
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