RUST PREVENTING CHARACTERISTIC OF MINERAL OILS: ASTM D665
(Equivalent Test Methods: IP 135, ISO 7120, DIN 51585, JIS K 2510, and AFNOR T60-151)
EXPLANATION
In many instances, such as in the gears of a steam turbine, water can become mixed with the lubricant, and rusting of ferrous parts can occur. This test method indicates how well inhibited mineral oils aid in preventing this type of rusting. This test method is also used for testing hydraulic and circulating oils, including heavier-than-water fluids.
TEST SUMMARY
A mixture of 300 mL of the oil under test is stirred with 30 mL of distilled water or synthetic sea water, as required, at a temperature of 60° C (14° F) with a cylindrical steel specimen completely immersed therein. It is customary to run the test for 24 h; however, the test period may, at the discretion of the contracting parties, be for a shorter or longer period. The specimen is observed for signs of rusting and, if desired, degree of rusting.
TEST PRECISION
Since the results of the test are only intended to give a pass/fail rating to the oil being tested, no statement is made about either the precision or the bias of this test method.
