basestocks and varnish - again.

[Shannow]

A colleague who recently completed a thesis on Membrane Patch Colorimetry, sent me a message to say that ASTM d7843 has been approved, standardising the test.

http://www.machinerylubrication.com/Read/29206/varnish-testing-standard

http://www.fluitec.com/en/remository/func-startdown/72/

 

[fpracha]

thanks!
so is there a separate std. test for varnish in engine oils, or with the same ASTM test apply ?

 

[Shannow]

I doubt that it's got into IC engines yet...

Have been presenting the stuff here to trigger enquiring minds who may like to start their own tests...

 

[GMorg]

The standard appears to be for turbine oils for now. I thought that it was interesting that the test cannot be run on oils that contain dyes. It sounds like this test can only become accepted for PCMO if the industry stops wasting resources on dyes. What will the marketing people do? Can BITOGers use a colorless oil?

The following abstract mentions the dye issue:
http://www.astm.org/search/sedl-search.html?query=d7843

 

[Shannow]

Yep,
we've been (the young bloke who did it on our turbines and proved that a properly calibrated flat bed scanner can get the job done for quite a reasonable cost) discussing IC engines, and there's way too much "stuff" happening in IC enginges for this emerging technology to be applied...yet.

Turbines are limited number of similar applications, similar basestocks, and add packages, and unless you are getting it really wrong (sparking in filter media or return oil piping, microdieseling in bearings etc.), only a few numbers of degredation mechanisms.