The ISO cleanliness code, based on ISO 4406:99, quantifies the level of particulate contamination in fluids like hydraulic oils. It's a crucial metric for maintaining the health and efficiency of machinery. The code is represented by three numbers separated by slashes (e.g., 18/16/13), each signifying the particle count per milliliter exceeding a specific size threshold: 4, 6, and 14 microns, respectively. These numbers represent ranges, not precise counts.
Understanding the ISO Code Numbers
- First Number (4μm): Indicates the particle count larger than 4 microns.
- Second Number (6μm): Represents the particle count larger than 6 microns.
- Third Number (14μm): Shows the particle count larger than 14 microns.
A lower number in each position indicates cleaner fluid. For example, a code of 16/14/11 signifies cleaner fluid than 18/16/13. Several online calculators, such as the one provided by Chevron Lubricants (https://www.chevronlubricants.com/en_us/home/services/self-services/industrial-machinery/isoclean-calculator.html), can assist in determining the ISO cleanliness code based on particle counts.
Importance of ISO Cleanliness Codes
Maintaining optimal cleanliness levels, as indicated by the ISO code, is essential for preventing premature wear and tear of machinery components. Regular testing and monitoring help ensure efficient operation and extend the lifespan of equipment. Industries heavily reliant on hydraulic systems, such as manufacturing and construction, frequently use ISO cleanliness codes for preventative maintenance and quality control.
