Iso 4406 table
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What may be confusing about ISO codes is that the ISO code number corresponds to a range, not a volume of fluid contamination particles. An ISO code of 12 expresses a range of particles of 20 to 40 in number. In other words, an ISO code of 11 communicates a range of particles between 10 to 20 in number. Notice as the ISO code number increases by one, the quantity range doubles. The table below is a typical representation of ISO cleanliness codes. The first number represents the total quantity of particles >4 microns, the second >6 microns, and the third >14 microns. The code is a global standard used to report and count the particles in a 1 ml sample measured by laser, and the test result is declared in three-digits. ISO Cleanliness Code is a three-digit value used to communicate particulate contamination in the oil.
#Iso 4406 table how to#
Let’s have a closer look at what ISO 4406 cleanliness means and how to measure it and maintain cleanliness. The ISO 4406 Cleanliness Codes are national standards that provide cleanliness in vehicles, equipment, and machinery.
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In comparison, the human hair diameter is around 70-microns, so you can imagine how small these particles are. All the 6- and 14-micron particles are counted in the 4-micron section, and the 14-micron particles in the 6-micron section. The smaller the number is, the cleaner the oil. Today the ISO code includes gear oils, engine oils, and various other industrial oils. Originally this ISO standard was designed for hydraulic oils to determine if the oil was clean enough to pass through small components and tubes in valves, controllers, and actuators. When the code increases, the quantity range of particles doubles. Each number typifies a contaminant level code for the correlating particle size. The ISO code is expressed in three numbers, for example, 18/16/13. This system rate and quantify the number of particulate contamination levels per milliliter of fluid at three sizes larger than 4-, 6-, and 14 microns. In 1999, The International Organization for Standardization developed a system ISO 4406:1999.
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While working in the hydropower industry, most probably you have stumbled upon the term ISO 4406? What the code is referring to is ISO 4406:1999 standard for oil cleanliness.