Como Filtration Systems


6534 Filter Element

The 6534 is our most popular filter element. This filter has four segments, and we designed it to fit in our C-1000 series filter housing—as well as equivalent competitive housings. The 6534 is made of cellulose, and excels at petroleum-based fluid filtration. This particular filter has a nominal filtration rating of 1 micron. Typical applications would involve oils with a viscosity ranging from 30 to 100 cSt (100 - 500 SUS) at temperatures up to 270 °F.

Dirt-Holding Capacity

In some applications, the Como 6534 (and other 6500-series filter elements) has demonstrated dirt-holding capacities in excess of forty pounds*. However, in typical applications, you can expect a solid-contaminant loading of several pounds.

Since the solid holding capacity of an element is determined by factors such as the element configuration, fluid flow-rate, particle size distribution, cake porosity, water content, and operating pressure, it is difficult to estimate the ultimate filter-element holding-capacity for a specific application.

Water Absorbency

The COMO 6534 filter element has excellent water absorption qualities, and can keep water contamination to 30 ppm or below*. You can expect the COMO 6534 filter element to remove and retain up to two quarts (½ gallon) of water over its lifetime—even up to one gallon, under the right circumstances*. This property makes COMO filter elements ideal for hydraulic filtration systems, especially for dirt and moisture intolerant servo, precision, and high-reliability hydraulic systems.

Beta Ratio

Filtration beta ratios are calculated by dividing the upstream (unfiltered) particle count for a given micron rating by the downstream (filtered) particle count for that micron rating. This, in effect, shows the filtration efficiency for particles of all different sizes. Beta ratios are standardized, allowing you to compare filtration performance from one manufacturer to another.

However, when using beta ratios to compare filter performance, you must take into consideration the differences between standard filters and depth filters, like the COMO 6534. Standard filters often have high beta ratios; however, they quickly load with contaminant, causing a spike in differential pressure that leads to short element life. On the other hand, depth filters have both high beta ratios and larger dirt holding capacities, which allows for continued performance over a longer period.

Typical beta ratios for a 6534 filter element:

  • .1–1µm    <25
  •  1–2µm    >25
  •  3–5µm    >250
  •  5–10µm   >500
  •  10–25µm  >1000
  •  25–50µm  >5000

Flow Rate

The recommended flow rate for the COMO 6534 filter element is 2.5 GPM in light hydraulic oil. In heavier oils, flow may be 0.5-1.5 GPM. In very light oils, such as fuel oils, the filter may be used at flow rates as high as 5 GPM.

As a general guideline, the flow rate at normal operating temperature should be such that the differential filter pressure on a new element is in the range of 15-30 psi. Selecting a combination of filters and flow rates to yield startup-pressures in this range will result in maximum filter life.


*Ultimate dirt and water holding-capacity changes based upon specific applications, individual results may vary.