ASTM D6335 Determination of High Temperature Deposits by Thermo-Oxidation Engine Oil Simulation Test
1. Scope
1.1 This test method covers the procedure to determine the amount of deposits formed by automotive engine oils utilizing the thermo-oxidation engine oil simulation test (TEOST). An interlaboratory study has determined it to be applicable over the range from 10 to 65 mg total deposits.
NOTE 1 - Operational experience with the test method has shown the test method to be applicable to engine oils having deposits over the range from 2 to 180 mg total deposits.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Terminology
2.1 Definitions of Terms Specific to This Standard:
2.1.1 ceramic isolator - the fitting that compresses the o-ring into the depositor rod casing and isolates the depositor rod casing from the voltage applied to the depositor rod.
2.1.2 depositor rod - the steel rod on which the deposits are collected. It is resistively heated through a temperature cycle during the test.
2.1.3 depositor rod casing - the sleeve that surrounds the depositor rod and allows the flow of specimen around the outside of the rod.
2.1.4 drain tube - the tube connecting the outlet of the depositor rod casing to the reaction chamber.
2.1.5 end cap - the fitting to tighten the ceramic isolators down onto the o-rings at the ends of the depositor rod casing.
2.1.6 pump - the gear pump that controls the flow rate of sample through the depositor rod casing.
2.1.7 pump inlet tube - the tube connecting the reactor chamber to the pump.
2.1.8 pump outlet tube - the tube connecting the pump to the depositor rod casing.
2.1.9 reactor chamber - the reservoir that contains the bulk of the sample throughout the test. It has a drain valve for removing sample at the end of the test and an inlet valve for adding gases to the sample. The chamber contains a magnetic stir bar well in the bottom in which a stir bar is placed to mix the reactor contents.
2.1.10 rod o-rings - the o-rings that seal the outside of the rod and the depositor rod casing to prevent sample leaks.
2.1.11 side nut - the fitting creates a seal to prevent sample leaking from the front holes of the depositor rod casing.
2.1.12 thermocouple lock collar - a fitting that tightens on the thermocouple to ensure the thermocouple is at the correct depth when placed inside the rod.
2.1.13 rod deposits - the mass in mg of the deposits collected on the depositor rod.
2.1.14 filter deposits - the mass in mg of the deposits collected on the filter cartridge.
2.1.15 total deposits - the rod deposits plus the filter deposits.
