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TERMS REL RELATING TING TO THE PETROLEUM INDUSTRY A B C D E F G H I j k L M N O P T Tacky A descriptive term applied to lubricating oils and greases which appear particularly sticky or adhesive. Tag Closed-cup Tester An instrument used to determine the flash point of volatile flammable materials flashing below 200°F, as described in ASTM Method D 56. TAN (Total Acid Number) The quantity of base, expressed in terms of the equivalent number of milligrams of potassium hydroxide, that is required to titrate the strong acid constituents present in 1 g of sample (ASTM Method D 664 or D 974). TBN (Total Base Number) The quantity of acid, expressed in terms of the equivalent number of milligrams of potassium hydroxide, that is required to titrate the strong base constituents present in 1 g of sample (ASTM Method D 664 or D 974). Thixotropy The property of a grease, or some gels, to decrease in consistency when subjected to a shear stress and return to original consistency when the stress is removed. Timken EP Test The Timken Extreme Pressure Test is one of many laboratory machines used in determining the load carrying capacities of oils and greases. In this test, a Timken bearing cup is rotated against a steel block. The highest load under which a lubricant prevents scoring of the steel block by the rotating cup is the reported value.
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