As of April 3, 2017, Castrol® is changing the way particle count (PC) results will be evaluated and communicated in Labcheck used oil analysis reports.
Because more customers are becoming interested in hydraulic fluid cleanliness… driven by tight-tolerance / high-pressure hydraulic systems… the need to monitor particle count has increased. At the same time, the variables affecting acceptable PC levels have also increased.
Some of those variables include:
As a result, fluid-cleanliness demands for in-use oils are different for different systems. A gear pump system operating at pressures <1,500 psi will be much more tolerant to small particles than a variable-displacement pump system operating at >2,500 psi.
The additive composition of the fluid adds another layer of complexity. Certain components of the additive package, defoamants in particular, may be picked up during a lab test and can skew the particle count, which can result in a higher PC.
In other words, PC testing is no longer a “one size fits all” proposition. As a result, the PC evaluation of different hydraulic systems must vary, which creates a myriad of systems that need to be evaluated differently.
For these reasons, Castrol will no longer “flag” PC results on Labcheck reports. The ISO cleanliness code will still be displayed on the report, but that code will no longer receive a severity flag.
Should you have any questions about this change, please contact your Castrol sales representative or field engineer.
Please see below for an ISO Cleanliness Codes for Particle Distribution summary.