This post is not about company turnover, it is about retaining particles! “Retention” in filtration referrs to a specific particle size selected for removal. For example, a “100 Micron” bag is capable of capturing particles that are at least 100 microns across.
Retention is not a cut-and-dry subject. Filter media tends to fall within two categories of retention: “Nominal” and “Absolute”.
Using our 100 micron example, Nominal filter media is able to retain 60-70% of particles that are 100 microns across or larger. Nominal media tends to be a single, or thin layer of construction and are generally cost-effective. It is normally used at the beginning or middle of a filtration process.
An Absolute filter media is engineered to remove 99% or more particles at the stated retention. Such precision is common in retentions 25 microns and smaller. This is because the media is multi-layered or a more precise grade for the sake of performance. Absolute filter media is normally used at the end of a filtration process for final quality assurance.
This post can be considered a “nominal” view of retention. Contact Findlow Filtration today to learn more about filter retention and what will work best for your process!