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Polyurethane (PU) springs, also known as urethane springs, are high-performance elastomeric components designed to replace traditional metal or rubber springs. Engineered from premium polyether-polyurethane, they deliver superior load capacity, exceptional resilience, outstanding wear resistance, and reliable vibration damping even in harsh industrial environments. Unlike metal springs, PU springs are non-magnetic, corrosion-resistant, and quiet in operation, making them the ideal choice for press tooling, stamping dies, heavy machinery, automotive, and mining applications. |  |
· High Load-Carrying Capacity: Withstand heavy loads up to 55 MPa tensile strength; 100% load-bearing surface for efficient force transfer.
· Exceptional Resilience: Compression set <10%; rebound reliably after repeated compression (up to 15% continuous deflection, 25% intermittent).
· Superior Durability: Resist abrasion, oils, greases, solvents, ozone, and corrosion; service life 3–5x longer than rubber/metal springs.
· Wide Temperature Range: Operate reliably from -40°C to +80°C (standard); special formulations up to +120°C.
· Non-Magnetic & Electrically Insulating: No magnetic interference; safe for electronic/medical equipment.
· Noise & Vibration Reduction: Dampen shocks and vibrations effectively; quiet operation vs. metal springs.
· Customizable: Available in cylindrical, rectangular, tube, bushing, pad, and custom-molded shapes; multiple durometers (Shore A 70–95).
Parameter | Standard Value | Unit |
Material | Polyether-polyurethane elastomer | - |
Hardness (Durometer) | 70 / 80 / 90 / 95 | Shore A |
Tensile Strength | 25–55 | MPa |
Elongation at Break | 300–600 | % |
Compression Set (70°C, 22h) | <10 | % |
Operating Temperature | -40 to +80 (standard); up to +120 (special) | °C |
Density | 1.2–1.3 | g/cm³ |
Size (OD × ID × Free Length) | Load at 10% Deflection | Max Continuous Deflection | Max Intermittent Deflection |
20 × 6 × 20 mm | 1.9 kN | 15% | 25% |
25 × 8 × 25 mm | 2.8 kN | 15% | 25% |
30 × 10 × 30 mm | 3.8 kN | 15% | 25% |
Custom Sizes | Custom Loads | 15% | 25% |
· Max Free Length: 2.5 × Outside Diameter (to avoid buckling).
· Stacking: Can be stacked in series with guide rods and spacers for longer travel.
· Lateral Expansion: Diameter increases ~1:1 with compression; allow clearance in design.
· Press Tooling & Stamping Dies: Punch presses, die sets, blank holders, stripper plates.
· Heavy Machinery & Equipment: Crushers, conveyors, hydraulic presses, machine mounts.
· Automotive: Suspension bumpers, shock absorbers, clutch components, vibration isolators.
· Mining & Construction: Load-bearing pads, shock dampers, vibration isolators for mining equipment.
· General Industrial: Vibration damping, noise reduction, shock absorption, non-magnetic spring solutions.
We offer full custom polyurethane spring solutions tailored to your exact requirements:
· Custom dimensions (OD, ID, free length, shape).
· Custom durometers (Shore A 70–95) for specific load/deflection needs.
· Special formulations for extreme temperatures, chemical resistance, or high-cycle fatigue.
· CAD modeling, prototyping, and low/high-volume production.
· Premium Quality: Made from 100% virgin polyether-polyurethane for consistent performance.
· Strict Quality Control: 100% inspection for dimensions, hardness, and load capacity.
· Competitive Pricing: Cost-effective alternative to imported urethane springs and metal spring replacements.
· Fast Delivery: Stock sizes available for immediate shipping; custom orders in 7–14 days.
