High quality hydraulic seal wear-resistant polyurethane PU seal

Hydraulic Polyurethane (PU) Seals: Technical Specifications

1. Material Characteristics

Composition: PU elastomers with customizable formulations, often reinforced
with fiberglass/carbon fibers[3]

Key Properties:

Abrasion Resistance: 3-5x longer service life than NBR rubber

Pressure Tolerance: Maintains sealing at ≤40MPa (enhanced grades)

Temperature Range: -40°C to +100°C (short-term 120°C)

2. Performance Comparison

AdvantageLimitation▶ Extreme wear resistance ▶ Inferior to FKM at >100°C ▶
Excellent dynamic sealing▶ Vulnerable to hydrolysis ▶ Cost-effective for
heavy-duty use▶ Requires precise installation

3. Industrial Applications

Primary Functions:

Prevent fluid leakage in reciprocating systems

Exclude contaminants in construction equipment

Common Configurations:

U-Cups: For piston/piston rod sealing

UN Seals: Bidirectional pressure sealing

UHS Series: High-pressure hydraulic cylinders

4. Selection Guidelines

Dimensional Parameters:

Example: UN 50×60×10 = 50mm ID × 60mm OD × 10mm thickness

Chemical Compatibility:

Avoid ester-based fluids and ketone solvents

Not recommended for water-glycol systems >60°C

Typical Service Life: 2-5 years in mining/construction equipment under proper
maintenance

Minimum Order: 100 pieces

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