TECHNICAL REFERENCE
Media Application Guide and ISO Rating System
The Application Guide for Donaldson Filter Media on page 158 provides a data format for rating fluid contamination level and plotting filter media performance. The vertical numbers on the left side of the chart represent particle counts in a logarithmic progression of ten: .01, .1, 1,10, 102, 103, 104, 105 and 106. (This represents the number of particle in the oil sample at the given size.) The numbers across the bottom of the chart represent particle size in microns. Donaldson media efficiency performance levels are derived from the ISO 16889 test standard with NIST-certified on-line automatic particle counters and ISO medium test dust. The Donaldson media efficiency performance levels shown are based on test averages under steady flow conditions. Actual performance levels may vary by application, viscosity, flow variance and contamination differences. Contact Donaldson or your Donaldson distributor for specific application calculations. The international rating system for fluid contamination levels is called the ISO contamination code and it is detailed in the ISO 4406 document. Most component manufacturers publish filtration level recommendations using the ISO code. The ISO code, located on the right side of the media application guide on page 158, is easy to use if you remember the 4 m, 6 m and 14 m numbers along the bottom of the chart. Manufacturer’s ISO contamination levels are based on controlling the particle counts of 4 m, 6 m and 14 m particles in hydraulic system oil. This level is identified by measuring the number of particles 4 m and greater, 6 m
and greater, and 14 m and greater in one milliliter of the system hydraulic oil sample. How to Use the ISO Rating Example: A cartridge valve manufacturer recommends an ISO cleanliness level of 18/16/13. 1) On the Application Guide for Donaldson Filter Media on page 158, place a dot on the vertical 4 m line, horizontally even with the 18 box of the ISO code. 2) Place a dot on the vertical 6 m line horizontally even with the16 box of the ISO code. 3) Place a dot on the vertical 14 m line horizontally even with the13 box of the ISO code. 4) Connect the dots to get the ISO cleanliness level 18/16/13. As illustrated below, particle counts falling on and above the 18/16/13 line are damaging to the component and exceed the 18/16/13 specification set by the manufacturer. Select a Donaldson media that falls below 18/16/13 to achieve cleanliness level tolerable to the component.
x x x x x x x x x x x x
ISO 18/16/13 PARTICLES HARMFUL TO THE COMPONENT
18
13
Range of number of particles per milliliter: Code More Than Up to & Including 24 80,000 160,000 23 40,000 80,000 22 20,000 40,000 21 10,000 20,000 20 5,000 10,000 19 2,500 5,000 18 1,300 2,500 17 640 1,300 16 320 640 15 160 320 14 80 160 13 40 80 12 20 40 11 10 20 10 5 10 9 2.5 5 8 1.3 2.5 7 .64 1.3 6 .32 .64 ISO 4406 Contamination Code
PARTICLES TOLERABLE TO THE COMPONENT
μm
4 6
14
Hydraulic Filters & Accessories • 29
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