FED-STD-791D
Method 3457.2
September 30, 1986
HYDROLYTIC STABILITY
1. SCOPE
1.1 This method is used for determining the resistance of a finished oil to reaction
when in contact with water.
2. SUMMARY
2.1 The test consists of tumbling under specified conditions, a mixture of the oil
and water in a bottle containing a copper strip, and then testing for changes in the oil,
water, and copper.
3. SAMPLE SIZE
3.1 Approximately 125 g of the oil to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Standards.
4.1.1 ASTM D 445 - Kinematic Viscosity of Transparent and Opaque Liquids.
4.1.2 ASTM D 974 - Neutralization Number by Color - Indicator Titration.
4.1.3 ASTM D 1500 - ASTM Color of Petroleum Products.
4.2 Oven, convection, air; controllable to 0.5C (1F) in temperature range of
66 and 93C (150 and 200F).
4.3 Fluid container (carbonated beverage bottle), 210 mL (7 oz), capable of being
sealed with a cork-lined steel cap.
4.4 Tumbling mechanism (for rotating the fluid container end-over-end at 5 rpm,
inside the oven).
4.5 Brush, short-bristled, stiff (typewriter cleaning brush, or equal).
4.6 Gooch crucible.
4.7 Centrifuse, 1500 rpm.
4.8 Centrifuge tubes, cone-shaped, 100 mL.
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