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Reply to "Ferrography"

Thanks Stevis and mr. Hughes,
We are a big underground mining industry and we are not interested in doing these test on site. We send our sample away for analysis. We have people with pretty good knowledge in other kind of oil and grease analysis but nobody have been trained on ferrography yet. We have been recommended to send our underground ventilation fan's grease for ferrography, we got the results but we don't really know what it means.
We got a report from the analysis company but we are interested to know on what they base these recommendations.
What is a bad number for Normal wear, Severe wear, etc?? What is the signification of these number, are they PPM or??
Thanks
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