Hengst PureLine Filter Elements – Standard filtration or technical reserve, depending on the application
An incorrectly specified hydraulic filter element rarely reveals itself immediately; instead, the consequences appear as rising maintenance costs, unplanned downtime, or premature wear of hydraulic components. With PureLine, Hengst Filtration therefore offers not a one-size-fits-all solution, but two distinct product lines tailored to different operational realities: PureFunction and PurePower.
Two lines, two application profiles
PureFunction is designed for standard hydraulic applications: machine tools, injection molding machines, presses, and similar industrial systems operating with mineral oil-based fluids under stable, predictable conditions. Here, one thing matters above all: that filtration works effectively without placing an unnecessary burden on operating costs.
PurePower steps in where standard specifications fall short. This applies to scenarios such as offshore applications, where filter changes are complex and access is restricted; steel mills and other critical production systems where unplanned downtime incurs high costs; systems using fire-resistant fluids (such as HFDR) that require specific fluid compatibility; and systems where electrostatic discharge (ESD) must be controlled. The common denominator in these cases is the need for additional technical reserves and safety margins that go beyond standard requirements.
Choosing between the two lines is therefore not a question of quality, but of application—determined by operating conditions, fluid type, maintenance intervals, and the need for technical reserves.
Technical Profile of PureFunction
In terms of design, PureFunction is based on a five-layer media structure made of high-quality glass fiber media, combined with a robust support structure and galvanized components. This combination delivers:
- Retention rate βx(c) ≥ 200 according to ISO 16889 – filtration performance compliant with standards
- Low differential pressure for energy-efficient operation and reduced system load
- Verified pressure stability according to ISO 2941
- Filtration ratings of 6, 10, and 20 µm, selectable according to requirements
In practice, this means a balanced performance combining oil cleanliness and energy efficiency, reliable service life for predictable maintenance intervals, and broad interchangeability that allows for use in many existing systems without modifications.
Technical Profile of PurePower
PurePower filter elements feature a six-layer construction with a core of asymmetrically arranged inorganic glass fiber layers—comprising pre-filtration, intermediate filtration, and main filtration layers—which together achieve a high retention rate and dirt-holding capacity while maintaining low differential pressure. The structure is complemented by support mesh on the inlet and outlet sides, as well as a conductive layer that protects the element against electrostatic charge buildup and discharge; the latter is a standard feature of PurePower.
A distinctive design feature is the flow guidance: instead of striking the filter element directly, the fluid is fed in tangentially and flows downward along the element in a helical motion—a patent-pending process that transports coarse dirt particles outward and downward before they can prematurely clog the filter pores. This extends replacement intervals by 7 to 10 percent compared to the previous design, while the elements capture up to 50 percent more dirt particles—all while maintaining a comparable retention rate and low differential pressure.
In practical operation, this translates to longer service lives, reduced maintenance effort in hard-to-reach locations (e.g., offshore), and standard ESD protection for applications with such requirements.
Industries and Applications
PureFunction is primarily used in general mechanical and plant engineering: machine tool manufacturing, plastics processing (injection molding), press manufacturing, and comparable industrial sectors utilizing mineral oil-based hydraulics.
PurePower is designed for industries with demanding operating conditions or specific fluid requirements:
- Offshore oil and gas extraction: difficult access, requiring long maintenance intervals
- Steel and metallurgical industries: critical production systems; use of fire-resistant fluids (HFDR) in some cases due to elevated fire risk
- Mining: challenging operating environments, fire-resistant hydraulic fluids
- Systems with ESD requirements: e.g., potentially explosive atmospheres where electrostatic discharge must be controlled
Advantages and benefits by series
PureFunction
Advantage Operational benefit
Balanced filtration performance Reliable oil cleanliness without oversizing the filtration systems
Reliable service life Predictable maintenance intervals, reduced personell requirements
Cost-efficient filtration Lower total cost of ownership for standard application
Broad interchangeability Can be used in existing systems without modification
Global availability Short supply routes, including at international locations
PurePower
Advantage Operational benefit
High dirt-holding capacity Longer change intervals (+7-10%), reduced maintenance effort
Patent-pending flow design Delayed pore blocking, stable filtration performance over the service life
Standard ESD protection Reduced risk of discharge at no extra costs or special order
Broad fluid compatibility Suitable for use with fire-resistant / synthetic fluids (e.g. HFDR)
Additional technical reservices Increased operational reliability for critical, hard-to-access systems
Key-Buying-Factors
In practice, the following questions determine which model series is suitable:
1. Accessibility for filter replacement: difficult to access (e.g. offshore) PurePower
easy to maintain on a regular basis PureFunction
2. Cost of unplanned downtime: high (critical production systems) PurePower
moderate PureFunction
3. Fluid type: mineral oil-based PureFunction
fire-resistant / synthetic ´ PurePower
4. ESD requirements: yes, e.g. potentialy explosive atmosphere PurePower (standard feature)
no requirement PureFunction sufficient
5. Cost focus: economical standard operation PureFunction
investment in extended service life and reliability PurePower
Selection criteria at a glance
- Operating conditions: standard vs. demanding
- Fluid type: mineral oil-based vs. fire-resistant/synthetic
- Maintenance interval and accessibility for filter replacement
PureFunction as an alternative to original HYDAC filter elements
Beyond standard applications, PureFunction also excels as a compatible alternative to original HYDAC filter elements. As an official sales partner of Hengst Filtration, FILCOM stocks suitable PureFunction versions for numerous HYDAC sizes—including the 1300R010ON, 2600 R010ON, and 0330R010ON. This shortens procurement times, particularly when a filter change is required on short notice.
Are you looking for a cost-effective alternative to original HYDAC filter elements? In our online shop, you will find a wide range of PureFunction filter elements available as alternatives for HYDAC applications.
Discover our product range and view PureFunction filter elements online now.
FILCOM as a Sales Partner of Hengst Filtration
As an experienced sales partner of Hengst Filtration, FILCOM provides support in selecting the right filter element—offering everything from technical consultation to practical implementation. Extensive stock levels of PureFunction filter elements ensure rapid response times and reliable delivery capabilities, backed by Hengst’s global sales and service network.
Unlock potential together—contact the team at FILCOM GmbH!
We are available for personal consultations, technical inquiries, or to discuss specific applications.
