ASTM D7528-22

SIGNIFICANCE AND USE 5.1 This bench test method is intended to produce comparable oil aging characteristics to those obtained with ASTM TMC Sequence IIIGA matrix reference oils 434, 435, and 438 after aging in the Sequence IIIG engine test. 5.2 To the extent that the method generates aged oils comparable to those from the Sequence IIIG engine test, the measured increases in kinematic and MRV viscosity indicate the tendency of an oil to thicken because of volatilization and oxidation, as in the Sequence IIIG and IIIGA (see Appendix X1 in Test Method D7320) engine tests, respectively. 5.3 This bench test procedure has potential use in specifications and classifications of engine lubricating oils, such as Specification D4485. 5.4 The results of this test method are valid when seeking qualification of oils against published specifications only when run on a test stand that has successfully met the calibration requirements specified under the TMC’s ROBO test monitoring program. SCOPE 1.1 This test method describes a bench procedure to simulate the oil aging encountered in Test Method D7320, the Sequence IIIG engine test method. These aged oils are then tested for kinematic viscosity and for low-temperature pumpability properties as described in the Sequence IIIGA engine test, Appendix X1 of Test Method D7320. 1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exceptions—There are no SI equivalents for some apparatus in Section 6, and there are some figures where inch units are to be regarded as standard. 1.3 This test method is arranged as follows: Section Scope 1 Reference Documents 2 Terminology 3 Summary of Test Method 4 Significance and Use 5 Apparatus 6 Reagents and Materials 7 Hazards 8 New and Existing Test Stand Calibration 9 Procedure 10 Cleaning 11 Calculations and Determination of Test Results 12 Report 13 Precision and Bias 14 Keywords 15 Annexes ASTM Test Monitoring Center: Organization Annex A1 ASTM Test Monitoring Center: Calibration Procedures Annex A2 ASTM Test Monitoring Center: Maintenance Activities Annex A3 ASTM Test Monitoring Center: Related Information Annex A4 Reaction Vessel Annex A5 Reaction Vessel Head Annex A6 Reaction Vessel-to-Head Seal Annex A7 Agitator Turbine Blade Annex A8 Agitator Packing Gland Annex A9 Nitrogen Dioxide Graduated Tube Annex A10 Vacuum System Plumbing Annex A11 Vacuum Trap Condensers Annex A12 Setting the Vacuum Control Valve Annex A13 Appendixes Sample Preparation and Addition Appendix X1 Charging the Liquid Nitrogen Dioxide Appendix X2 Nitrogen Dioxide Precision Needle Valve Appendix X3 Example of an Assembled ROBO Apparatus Appendix X4 Information Package to Aid Setting Up a New Robo Apparatus Appendix X5 Dilute Nitrogen Dioxide in Air Option Information Appendix X6 Time-Averaged Subsurface Air Flow Rate Appendix X7 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given in Sections 7 and 8. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.