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5 Hydraulic Oil Filters
What Beta Numbers Mean
• First number
– Filtration Ratio
• Second Number
– Particle Size
(Micron)
• Example of Beta Rating
particles
Micron particles
/5 = 98.6% of 5
Micron particles
Filtration Ratio
Filtration Ratio / Efficiency Table
1.01 1.0%
1.1 9.0%
1.5 33.3%
2.0 50.0%
5.0 80.0%
10.0 90.0%
20.0 95.0%
75.0 98.6%
100 99.0%
1000 99.9%
Filter Comparison
• Toro Filter
– Beta Rating
– 2/2
– 20/3
– 75/5
• Carquest
Filter
– Beta Rating
– 25/4
– 50/20
– 2/2 = 50% of 2 Micron
– 20/3 = 95% of 3
– 75
The Beta rating will consists of two numbers.
The first number is the filtration ratio.
The second number is the particle size, in
microns.
An example of a typical Beta Rating is:
2/2, That equals 50% of the 2 micron particles
20/3 That equals 95% of the 3 micron particles
75/5 That equals 98.6% of the 5 micron particles
This chart shows the filtration number and the
percentage of particles stopped.
This slide shows the Beta rating for a Toro
Hydraulic filter.
We can see that this filter captures 98.6 percent of
the 5-micron particles.
The competitive filter is not even an absolute 20-
micron filter.
TORO® Service Training