How is lubricant particle count measured in the lab? 

I’ve been doing this analysis for almost 2 years. Finally a proper explanation!! Thank you very much

Hello. I've been getting a 4 code difference between ISO 11500 and ISO 4407 for hydraulic oils. Which method would you consider more reliable?

Very informative. Thank you.

Very informative and great explanation. Is there any guideline describing selection criteria between ISO 4407 and ISO 11500 ?

My lab said they cannot do particle count analysis on used engine oils. They said it is more designed for "clearer" hydraulic oils. Is this normal? I wanted to see how effective my reusable stainless steel mesh oil filter was working. I was very disappointed to hear this. I am assuming they use the laser test method, then correct?

do you have an info the ASTM D7647 test? currently i run an LNF spectro system and would love to learn more

useful