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Polyurethane (PU) Sealing & Spacer components are engineered as dual-function elastomeric parts, integrating reliable sealing and precise spacing in one unit. Made from high-grade polyurethane (ether/ester-based), they deliver exceptional mechanical strength, wear resistance, and compression recovery, outperforming rubber and plastic in heavy-duty, high-friction, and fluid-exposed environments. Typically manufactured as flat rings, washers, or custom profiles, these parts seal gaps between mating surfaces (static/dynamic sealing) while maintaining consistent spacing, alignment, and load distribution in assemblies. |  |
· Superior Wear Resistance: 5–10× more durable than rubber; resists abrasion in high-friction motion.
· High Elasticity & Recovery: Low compression set; rebounds after long-term clamping/pressure.
· Oil & Chemical Resistance: Tolerates hydraulic oils, greases, fuels, and many industrial chemicals.
· Wide Temperature Range: Standard: -30°C to +80°C; custom grades: -45°C to +120°C.
· Precision Spacing Control: Consistent thickness/tolerance for accurate alignment and load distribution.
· Vibration Damping: Absorbs shock and reduces noise in dynamic assemblies.
· Customizable: Multiple hardness (Shore A 60–95), sizes, colors, and profiles (O-ring, flat, square, custom).
Parameter | Standard Grade (Ether PU) | Premium Grade (Ester PU) | Test Standard |
Material | Polyether Polyurethane | Polyester Polyurethane | — |
Hardness | Shore A 90 | Shore A 70 | ASTM D2240 |
Density | 1.15–1.25 g/cm³ | 1.20–1.30 g/cm³ | ISO 1183 |
Tensile Strength | ≥30 MPa | ≥25 MPa | ASTM D412 |
Elongation at Break | ≥400% | ≥450% | ASTM D412 |
Compression Set (25% defl., 70°C, 24h) | ≤20% | ≤25% | ASTM D395 |
Operating Temperature | -30°C to +80°C | -40°C to +90°C | — |
Color | Natural (translucent), black | Natural, black, custom | — |
Dimension | Range (mm) | Tolerance |
Outer Diameter (OD) | 8–50 | ±0.1 |
Inner Diameter (ID) | 3–30 | ±0.1 |
Thickness (T) | 1–8 | ±0.05 |
Custom sizes and profiles (rectangular, square, irregular) available upon request. |
· Hydraulic & Pneumatic Systems: Cylinder seals, piston rings, valve stem seals.
· Automotive: Suspension spacers, door seals, engine gaskets, bearing isolators.
· Industrial Machinery: Flange gaskets, conveyor spacers, vibration dampers, shaft seals.
· Electronics & Electrical: Enclosure gaskets, insulating spacers, shock-absorbing pads.
· Construction & Marine: Waterproof seals, joint spacers, corrosion-resistant gaskets.
1. Dual-Function Design: Combines sealing and spacing to simplify assembly and reduce part count.
2. Long Service Life: Resists aging, ozone, and hydrolysis; outlasts rubber in harsh conditions.
3. Cost-Effective: Lower total cost than specialty elastomers; easy to machine/cut for low-volume runs.
4. Strict Quality Control: ISO 9001 certified; batch testing for hardness, tensile, and compression set.
· Hardness: Shore A 60/70/80/90/95.
· Size: Custom OD/ID/thickness; die-cut, waterjet, or molded profiles.
· Color: Black, natural, white, or custom colors.
· Form: Flat washers, O-rings, square rings, strips, or 3D profiles.
