INTERNORMEN Replacement Filters – Three Temperature Grades, 99.95% Efficiency, Drop-In Fit

1. Application Background & Core Functional Requirements

Aite INTERNORMEN Replacement Filter Elements are high-precision filtration components designed for hydraulic stations serving 

as the power source for heavy machinery, metallurgical rolling equipment, injection molding machines, wind turbine pitch control 

systems, and automated production lines. Circulating hydraulic oil contains multiple contaminant types generated during 

operation – including metal wear debris from pump gears and valve spools, rust particles from pipeline corrosion, thermal oxidation

 sludge and varnish from oil degradation, and rubber fragments from seal wear. Particles below 5 microns can abrade servo valve

 spool surfaces, obstruct throttle orifices, and induce pressure fluctuations, vibration, and elevated system noise.

Aite INTERNORMEN Replacement Filter Elements are installed on main supply, return, and pressure control circuits of medium and 

large hydraulic stations. When original elements reach service limits or are subject to procurement delays, these interchangeable 

replacement filters maintain system operation – matching INTERNORMEN HC, 01E, 3000, and 03E series housings with identical 

dimensional interfaces, bypass valve parameters, temperature ratings, fatigue resistance, and seal integrity.

As a professional manufacturer specializing in import substitution filter consumables (not an authorized INTERNORMEN distributor), 

we deliver Aite INTERNORMEN Replacement Filter Elements with stable filtration performance, significantly shorter delivery cycles, 

and substantially lower procurement costs for industrial facilities worldwide.

2. Filter Media – Three Temperature Grades

Aite INTERNORMEN Replacement Filter Elements use asymmetric multi-layer borosilicate glass fiber composites validated

 per ISO 16889 (multi-pass filtration efficiency) and ISO 3724 (flow cyclic fatigue). The gradient pore structure features an outer 

coarse layer retaining large metal particles and rust, a middle transition layer adsorbing oil sludge and colloidal material, 

and an inner fine layer capturing micron-sized abrasive particles.

Grade 1: Standard Medium-Temperature Media

Applications: Systems with continuous oil temperature ≤100°C (cold rolling auxiliary hydraulics, low-load circuits). Structure:

 Three-layer borosilicate fiber with phenolic resin binder. Key Parameters: Continuous temperature -10°C to +100°C; 

filtration ratings 1, 3, 5, 7μm; Beta ratio βx ≥ 2000; capture efficiency ≥99.95%; dirt capacity 1300–1500 g/m².

 Associated Components: NBR seals, galvanized steel support core, polyurethane end cap adhesive. Compatible Models: 

01E series return filters.

Grade 2: Reinforced High-Temperature Media

Applications: Systems with continuous oil temperature 100°C–120°C (hot rolling mills, thermal power EH hydraulic stations). 

Structure: Four-layer borosilicate fiber with high-crosslink phenolic resin. Key Parameters: Continuous temperature -10°C to +120°C; 

transient peak ≤130°C for ≤30 minutes; tensile strength retention ≥91% after 1000h cyclic testing; dirt capacity 1600–1900 g/m². 

Associated Components: FKM seals, 304 stainless steel core, fluorine-epoxy end cap adhesive. Compatible Models: HC series

 pressure filters, 3000 series return filters.

Grade 3: Ultra-High Temperature Media

Applications: Systems with continuous oil temperature 120°C–140°C (furnace-front heavy-load stations, boiler actuator stations). 

Structure: Fluorinated composite glass fiber with high-temperature binder. Key Parameters: Continuous temperature -10°C to +140°C; 

transient peak up to 150°C. Associated Components: Modified full-fluorine FKM seals, 316L stainless steel support core. Operational 

Requirements: Install auxiliary oil coolers; reduce replacement interval by 30% relative to Grade 2 applications.

3. Component Matching – Dimensional and Material Compatibility

Aite INTERNORMEN Replacement Filter Elements are manufactured to match original INTERNORMEN housings – dimensional 

parameters, thread specifications, and bypass valve opening pressure all matching original settings. No housing modifications 

are required for installation.

Seal Material Media Grade Temperature Range Peak Tolerance Notes

NBR Grade 1 (≤100°C) -40°C to +100°C 110°C Swelling 16%–22% after 500h above 105°C

FKM (Viton) Grade 2 (100–120°C) -20°C to +120°C 130°C Swelling ≤3% after 1000h at 120°C

Modified FKM Grade 3 (120–140°C) -20°C to +140°C 150°C For high-viscosity aged oil and radiant heat

4. Selection by Operating Condition

Condition Oil Temperature Specified Configuration Compatible Models

Cold Rolling Auxiliary ≤100°C continuous; peak ≤105°C Grade 1 media + NBR seals + galvanized steel core 01E series return filters

Hot Rolling / Thermal Power EH 100–120°C continuous; peaks 125–130°C (<30 min) Grade 2 media + FKM seals + 304 stainless steel 

core HC series pressure filters, 3000 series return filters

Furnace-Front Heavy-Load 120–140°C continuous; peaks 140–150°C Grade 3 media + modified FKM seals + 316L core Custom

 configuration for extreme thermal loads

Aite INTERNORMEN Replacement Filter Elements Grade 2 configuration covers more than 90% of steel and power industry main 

hydraulic stations.

5. Operating Limits

Deviation from specified flow velocity, backwash air quality, or differential pressure thresholds reduces service life by 30%–50%.

Media Grade Maximum Velocity Operating Margin

Grade 1 0.8 m/min 20%

Grade 2 0.7 m/min 25%

Grade 3 0.6 m/min 30%

When instantaneous flow exceeds 115% of housing rated capacity, open bypass valve for flow division.

6. Failure Modes – Causes and Corrections

Failure Cause Correction

End Cap Leakage Adhesive temperature rating below operating temperature Use adhesive grade matching actual oil temperature

Rapid Differential Pressure Increase No upstream coarse pre-filter; large particles impact media Install 80–100μm pre-filter at inlet

Filtration Efficiency Below Specification Bypass due to seal swelling or shrinkage Replace with seal material matching temperature

 grade

Thermal Degradation Continuous operation above rated temperature Add cooling capacity; upgrade to Grade 3 media

7. Installation and Maintenance Procedures

Item Procedure

Pre-installation check Verify model number; inspect seal groove and media for damage

Seals Install new seals matching temperature grade; do not reuse

Housing preparation Clean sealing surfaces before installation

Differential pressure Record per shift; replace when alarm threshold is reached

Oil analysis Test acid value, water content, particle count monthly

Storage Store in dry, dustproof location; avoid sunlight

Not permitted Do not clean used elements with solvent, water, or compressed air

8. Frequently Asked Questions (FAQ)

Q1: What is the filtration efficiency of Aite INTERNORMEN Replacement Filter Elements?

A: Aite INTERNORMEN Replacement Filter Elements achieve Beta ratio βx ≥ 2000 per ISO 16889 – with ≥99.95% capture efficiency at 

the rated micron size.

Q2: Can Grade 1 media be used at 110°C?

A: No. Continuous operation above 105°C softens the resin binder and reduces efficiency. Grade 2 media is required for temperatures 

above 100°C in Aite INTERNORMEN Replacement Filter Elements.

Q3: When should Aite INTERNORMEN Replacement Filter Elements be replaced?

A: Replace Aite INTERNORMEN Replacement Filter Elements when differential pressure reaches the alarm value specified for the 

housing. Fixed-interval replacement is not recommended.

Q4: Can new and old elements be used together in the same housing?

A: No. All elements in a single housing of Aite INTERNORMEN Replacement Filter Elements should be replaced simultaneously to 

maintain uniform flow distribution.

Q5: What documentation is supplied with Aite INTERNORMEN Replacement Filter Elements?

A: Each shipment includes EN 10204 material certificates, ISO 16889 performance test reports, and dimensional inspection records.

Q6: Are Aite INTERNORMEN Replacement Filter Elements fully interchangeable with original elements?

A: Yes. Aite INTERNORMEN Replacement Filter Elements match original dimensions, thread specifications, and bypass valve opening 

pressure – enabling direct drop-in installation without housing modifications.

Q7: What seal materials are available for Aite INTERNORMEN Replacement Filter Elements?

A: Aite INTERNORMEN Replacement Filter Elements offer NBR seals for Grade 1, FKM (Viton) seals for Grade 2, and modified FKM 

seals for Grade 3 – matching the temperature grade of the selected media.

Q8: What is the maximum operating temperature for Aite INTERNORMEN Replacement Filter Elements?

A: Aite INTERNORMEN Replacement Filter Elements Grade 3 media supports continuous operation up to 140°C with transient 

peaks up to 150°C.

Q9: Can Aite INTERNORMEN Replacement Filter Elements be cleaned and reused?

A: No. Do not clean used Aite INTERNORMEN Replacement Filter Elements with solvent, water, or compressed air – the gradient 

structure is permanently damaged and efficiency cannot be recovered.

Q10: What oil cleanliness level can Aite INTERNORMEN Replacement Filter Elements achieve?

A: Aite INTERNORMEN Replacement Filter Elements maintain oil cleanliness at NAS 1638 Class 7 or better – protecting servo valves, 

pumps, and precision components from abrasive wear.

Q11: What industries use Aite INTERNORMEN Replacement Filter Elements?

A: Aite INTERNORMEN Replacement Filter Elements are widely used in metallurgy, thermal power, injection molding, wind energy, 

and automated production lines – covering virtually all medium and large hydraulic station applications.

Q12: Can I order samples of Aite INTERNORMEN Replacement Filter Elements before bulk purchase?

A: Yes. We support paid sample orders (1–5 pieces) with production lead time of approximately 5–7 days. Sample costs are fully

 deductible from your first bulk order upon approval.

Aite INTERNORMEN Replacement Filter Elements – three temperature grades, βx ≥ 2000 filtration efficiency, direct interchangeability

 with original housings, ISO 16889 and ISO 3724 validated. Contact us today for a free cross-reference check and competitive 

factory-direct quotation within 24 hours.