Re: D6335 and D7097 Revisions - Sub. 9 Ballot Dear Members: The purpose of this revision ballot is to make editorial changes for better performance and to align both methods. In D6335, three areas are being modified. First, the statement about medical grade nitrous must be changed to 99.6% purity because medical grade is not available in many locations. Second, it has been found that precleaning the filter may cause errors in the results. This is especially true when performing with the vacuum turned off. The hydrocarbon can soak into the polypropylene causing the weights to be off. Therefore, just an inspection is necessary for the filter and then the particulates are filtered and cleaned with the vacuum turned on. Third, some groups are using a plastic syringe for the catalyst and having problems with the syringe degrading. A glass syringe must be used. For D7097, it is only the glass syringe modification that is changing.
Keywordsdeposits; engine oil; oxidation; pyrolysis; TEOST; thermal decomposition; thermal oxidation; Fuel oils; Oxidation testing--petroleum products; Pyrolysis; Simulation testing; TEOST (thermo-oxidation engine oil simulation test); Thermal decomposition; Thermal oxidation stability;