ASTM D5763 Standard Test Method for Oxidation and Thermal Stability Characteristics of Gear Oils Using Universal Glassware
8. Sampling
8.1 Samples for this test method can come from tanks, drums, small containers, or operating equipment. Therefore, use the applicable apparatus and techniques described in Practice D4057 to obtain suitable samples.
8.2 Special precautions to preserve the integrity of a sample will not normally be required. It is good practice to avoid undue exposure of samples to heat, sunlight, or strong direct light. Visibly heterogeneous samples should not be used.
8.3 It is recommended that a 200-mL representative be obtained. To ensure the aliquot being tested is representative of the sample, agitation; for example, stirring or shaking of the oil prior to obtaining an aliquot, is recommended.
9. Preparation of Apparatus
9.1 Cleaning Glassware:
9.1.1 Clean new glassware by washing with a hot detergent solution (using a bristle brush) and rinse thoroughly with tap water. When any visible deposits remain, soaking with a hot detergent solution can be helpful. After final cleaning by soaking with a suitable cleaning solution rinse thoroughly with tap water and then distilled water, and allow to dry at room temperature or in an oven.
9.1.2 Used glassware should be cleaned immediately following the end of a test. When additional cleaning is necessary, use a non-chromic acid containing cleaning solution.
9.2 Heating Block or Bath - Ensure that the heating block or bath is able to heat the oxidation cell at the control temperature of 120°C.
9.3 Flowmeter - Ensure that the flowmeter is capable of delivering the desired flow rate of 3.0 L of air per hour.
