FED-STD-791D
Method 5308.7
September 30, 1986
CORROSIVENESS AND OXIDATION STABILITY OF LIGHT OILS (METAL
SQUARES)
1. SCOPE
1.1 This method is used for testing hydraulic oils (spindle oils), and similar,
highly refined, light oils to determine their ability to resist oxidation and their tendency to
corrode various metals.
2. SUMMARY
2.1 Metal specimens are suspended in a measured amount of lubricant. The oil,
at an elevated temperature, is blown with air for a period of time. When the test is
completed, the oil is tested to determine the extent of degradation. The metal specimens
are examined for corrosion.
3. SAMPLE SIZE
3.1 Approximately 225 mL of oil to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Test tube, borosilicate, standard-wall; 5.0 0.3 cm O.D., 50.0 1 cm long;
with open end formed as a male ground-glass joint, joint is Ts 71/60.
4.2 Condenser, Allihn type. Borosilicate, 3.5 cm O.D. (min.) by 300 2.0 cm
long jacket, with the lower end formed as a female ground-glass joint to mate with the
test tube; joint is Ts 71/60; drip tip in Ts joint, 60 cm, min length; tabulations are parallel
at opposite sides of the condenser, they are about 1.0 cm O.D.; open end has an I.D. of
approximately 2.2 cm.
The test tube (4.5.1) and condenser (4.5.2) may be obtained from:
NOTE 1:
John A. Glover
8225 Parkview Avenue
Munster, Indiana
4.3 Air tube, borosilicate, standard wall; 0.6 to 0.8 cm O.D., length at least 5.0
cm greater than combined length of assembled test tube and condenser, about 94.0 cm,
with one end drawn to a 0.16 0.04 cm (l/16 1/64 in) diameter orifice. A capillary
tube with a 0.16 0.04 cm (1/16 1/64 in) bore may be used.
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