Filter element 0990D and other models

Product characteristics

The HYDAC 0990D Series Filter Elementsare high-performance filtration components manufactured from 

premium imported (U.S.-origin) glass fiber and stainless steel mesh media. These elements are engineered to

 deliver reliable contamination control in hydraulic systems, offering an optimal combination of filtration efficiency,

 flow capacity, and durability.

The filter media is supported on both sides with robust, dimensionally stable backing layers, ensuring structural 

integrity under varying operating conditions. This construction complies with ISO 3724/76 hydraulic filter flow fatigue

 characteristics verification, guaranteeing long-term reliability in demanding applications.

Compatible with general hydraulic oils, the 0990D series provides consistent filtration performance across a wide

 range of operating temperatures and pressures.

Technical Specifications

Parameter Specification

Series HYDAC 0990D and related models

Filter media Imported glass fiber, stainless steel mesh, wood pulp filter paper

Filtration precision 1 μm – 100 μm (multiple grades available)

Operating pressure 21 bar – 210 bar (300 – 3,000 psi)

Sealing material Nitrile (NBR) rubber or Fluorocarbon (FKM/Viton) rubber

Working medium General hydraulic oil (mineral-based)

Operating temperature –10°C to +100°C

Media support Solid backing on both sides for enhanced stability

Fatigue compliance ISO 3724/76 – Hydraulic filter flow fatigue characteristics

Key Features

1. Premium Imported Media – Glass fiber and stainless steel mesh sourced from the United States ensure consistent quality,

 uniform fiber structure, and reliable filtration performance.

2. High Flow Capacity – Large circulation area design minimizes pressure loss while maintaining high flow rates, 

reducing energy consumption in the hydraulic system.

3. Excellent Filtration Efficiency – Available in precision grades from 1μm to 100μm to match diverse application requirements, 

from fine filtration to coarse strainer applications.

4. Robust Construction – Filter material is supported on both sides with dimensionally stable backing layers, preventing

 media deformation and ensuring structural integrity under varying flow and pressure conditions.

5. Simple Compact Design – Small volume and light weight simplify handling, installation, and replacement, 

while the straightforward structure ensures reliable operation.

6. Uniform Media Structure – Consistent fiber distribution throughout the media ensures predictable filtration performance

 and reproducible efficiency.

7. Convenient Maintenance – Simple design allows easy cleaning (for stainless steel mesh) or straightforward replacement

 (for glass fiber/paper elements).

8. ISO-Validated Fatigue Performance – Conforms to ISO 3724/76 verification for hydraulic filter flow fatigue characteristics, 

ensuring long-term reliability under cyclic flow conditions.

HYDAC Compliance Standards

All filter elements are manufactured and tested in accordance with internationally recognized ISO standards:

Standard Description

ISO 2491 Filter element – Rupture/burst resistance test

ISO 2492 Filter element – Structural integrity test

ISO 2493 Filter element – Material and fluid compatibility test

ISO 3723 Filter element – End load test method

ISO 3724 Filter element – Determination of flow fatigue characteristics

ISO 3968 Filter element – Determination of differential pressure vs. flow characteristics

Available Media Options

Media Type Characteristics Recommended Application

Glass fiber High efficiency, depth-loading, excellent particle retention Precision hydraulic systems, servo-valve protection

Stainless steel mesh Reusable, washable, high strength, corrosion-resistant Coarse filtration, suction strainers, return-line

 filters

Wood pulp paper Economical, good efficiency, disposable General-purpose hydraulic filtration, lower-cost applications

Applications

· Industrial hydraulic systems (machine tools, injection molding, presses)

· Mobile hydraulics (construction equipment, agricultural machinery)

· Lubrication systems (compressors, gearboxes, turbines)

· Test benches and fluid power laboratories

· Process fluid filtration in manufacturing environments

Maintenance Guidelines

1. Monitor Differential Pressure – Replace or clean the element when the pressure differential reaches the manufacturer's

 recommended change-out value (typically 2–3× initial clean pressure drop).

2. Regular Inspection – Visually inspect seals and media for damage during scheduled maintenance intervals.

3. Proper Handling – Avoid dropping or crushing the element to maintain pleat integrity and sealing effectiveness.

4. Stainless Steel Mesh Elements – Can be cleaned and reused. Use appropriate solvent and compressed air (reverse flow)

to remove trapped contaminants.

5. Glass Fiber & Paper Elements – Disposable. Replace with new elements when clogged or damaged.

6. Seal Replacement – Always replace O-ring seals during element change to ensure leak-free installation.

FAQ (Frequently Asked Questions)

Q1: What is the HYDAC 0990D series and what makes it special?

A: The 0990D series is a comprehensive line of hydraulic filter elements manufactured with premium imported glass fiber

 and stainless steel mesh media. They offer high flow capacity, low pressure loss, and ISO-compliant fatigue performance, 

making them suitable for demanding hydraulic filtration applications.

Q2: What filtration precisions are available for this series?

A: The 0990D series is available in precision grades from 1μm to 100μm. Please specify your required cleanliness level and 

application when ordering to ensure optimal performance.

Q3: What is the maximum operating pressure for these filter elements?

A: The working pressure range is 21 bar to 210 bar (300 to 3,000 psi), accommodating most industrial and mobile hydraulic 

systems. The exact pressure rating depends on the specific filter housing design as well.

Q4: Are stainless steel mesh elements washable and reusable?

A: Yes. Stainless steel mesh elements can be cleaned and reused multiple times. Use an appropriate solvent and reverse-flow 

compressed air (≤0.3 MPa) to remove trapped contaminants. Inspect for damage before reinstalling.

Q5: Can glass fiber elements be cleaned?

A: No. Glass fiber and wood pulp paper elements are disposable and cannot be cleaned. Attempting to clean them will damage

 the media and compromise filtration efficiency. Replace them when clogged.

Q6: What is the difference between nitrile (NBR) and fluorocarbon (FKM) seals?

A: NBR (butadiene rubber) is suitable for general hydraulic oils at standard operating temperatures. FKM (fluorocarbon/Viton)

 offers superior chemical resistance and higher temperature capability, recommended for high-temperature systems,

 aggressive fluids, or extended service intervals.

Q7: What are the ISO standards listed in the compliance table?

A: These ISO standards ensure quality and performance: ISO 2491 (rupture resistance), ISO 2492 (structural integrity), 

ISO 2493 (fluid compatibility), ISO 3723 (end load), ISO 3724 (flow fatigue), and ISO 3968 (pressure-flow characteristics). 

All are critical to ensure reliable filter performance in real-world conditions.

Q8: What hydraulic fluids are compatible with these filters?

A: The 0990D series is designed for general mineral-based hydraulic oils. For synthetic fluids, water-glycol emulsions, 

or fire-resistant fluids, please consult our technical team to verify media and seal compatibility.

Q9: How do I select the correct filtration precision for my system?

A: Selection depends on the sensitivity of your system components. For example: servo/proportional valves require 3–5μm,

 standard directional valves require 10–15μm, and pumps require 20–25μm. We recommend consulting your system 

manufacturer's specifications or our technical team for guidance.

Q10: What is the typical service life of a glass fiber filter element?

A: Service life varies based on system contamination levels, operating hours, and maintenance practices. 

Under normal conditions with proper pre-filtration, glass fiber elements typically last 6–12 months. Regular monitoring 

of the differential pressure indicator is the best way to determine replacement timing.

Q11: Are these filter elements compatible with high-viscosity fluids?

A: Yes, but the initial pressure drop will be higher with increased viscosity. For high-viscosity fluids, we may recommend a 

higher micron rating or increased filtration area. Please consult our technical team for viscosity-specific recommendations.

Q12: Do these elements have a bypass valve integrated?

A: The filter element itself does not include a bypass valve. However, most HYDAC filter housings incorporate an integrated

 bypass valve or clogging indicator. Please verify your housing configuration and ensure the bypass pressure setting matches

 your system requirements.

Q13: Are these genuine HYDAC equivalent elements or OEM original?

A: Our 0990D series elements are manufactured to meet or exceed HYDAC specifications and are fully interchangeable with

 original HYDAC elements. They comply with all relevant ISO standards and are offered as high-quality aftermarket 

alternatives with competitive pricing.

Product characteristics