ISO 4406: cleanliness codes explained
How to read the three numbers in a cleanliness code, and which classes a hydraulic, gear or diesel system typically needs to hold.
Knowledge: written for operations staff
Technical articles without the sales talk: on cleanliness classes, offline filtration, water in oil and the other factors that decide whether a system runs reliably. New articles are published on an ongoing basis.
Available now
How to choose filter paperSystem type, material and grammage, with a recommendation table, full specifications and FAQ.DatasheetsTechnical data for all filter paper series as a web page and PDF.How offline filtration worksThe Delta Xero principle: a kidney loop that cleans the oil down to 0.1 µm while the equipment is running.
Coming soon
Offline filtration in practice
Why a kidney loop cleans the oil better than the system's own filters alone, and how it is sized.
Water in oil: free, emulsified and dissolved
What the ppm figure covers, why emulsified water is the most harmful, and how it is removed during operation.
Diesel bug in stored fuel tanks
Microbial growth at the interface between water and diesel: symptoms, consequences and what actually works.
Varnish and lacquer formation
When oil degrades, the degradation products settle as varnish on valves and bearings. How to detect and remove it.
Can't wait for the article?
Then ask us directly. It is quicker, and we are happy to answer for your specific system rather than the general principle.