Quick Reference for Common Issues of Polyurethane Pads in Vertical Jacks
Polyurethane pads in vertical jacks are critical for safe lifting and load distribution. Understanding common problems and their causes helps ensure operational safety and extend pad service life.
1. Deformation and Bulging
Cause: Overloading, uneven load placement, or prolonged compression.
Effect: Uneven support, tilting, and reduced stability.
Prevention: Always operate within rated load limits and center the load on the pad.
2. Cracking and Surface Damage
Cause: Aging, exposure to UV light, extreme temperatures, or chemical contact.
Effect: Reduced load-bearing capacity and potential pad failure.
Prevention: Store pads properly, avoid direct sunlight, and use chemical-resistant grades when necessary.
3. Loss of Elasticity
Cause: Material fatigue from repeated compression or inferior material quality.
Effect: Pads fail to recover shape, leading to permanent deformation.
Prevention: Regular inspection, use of high-quality polyurethane, and proper load management.
4. Delamination or Detachment
Cause: Poor bonding between the pad and metal base, or prolonged mechanical stress.
Effect: Pad separation reduces stability and can cause sudden failure.
Prevention: Use manufacturer-approved pads and replace any showing signs of separation.
5. Oil or Chemical Damage
Cause: Exposure to oils, solvents, or harsh chemicals.
Effect: Swelling, softening, or embrittlement of the pad material.
Prevention: Use oil- and chemical-resistant polyurethane grades and clean pads regularly.
6. Tilt or Instability
Cause: Uneven load, warped pad, or soft/uneven ground.
Effect: Risk of jack slipping or tipping.
Prevention: Ensure level surfaces, rotate pad usage to avoid uneven wear, and use support plates if necessary.
7. Wear and Abrasion
Cause: Frequent use on rough surfaces or improper storage.
Effect: Loss of surface texture, reduced grip, and uneven load distribution.
Prevention: Inspect pads frequently, rotate them, and store on smooth surfaces.
Conclusion
Regular inspection and proper handling of polyurethane pads in vertical jacks are essential to prevent deformation, cracking, delamination, chemical damage, and instability. Using high-quality materials, operating within rated limits, and following maintenance guidelines ensures safe and long-lasting performance.
References
Gent, A. N. Engineering with Rubber: How to Design Rubber Components. Hanser Publishers, 2012.
Lake, G. J. “Fatigue and Fracture of Elastomers.” Rubber Chemistry and Technology, 2000.
ASTM D2240 – Standard Test Method for Rubber Property—Durometer Hardness.
ISO 2230 – Rubber Products—Guidelines for Storage and Maintenance.
ASTM D2000 – Standard Classification System for Rubber Products in Automotive and Industrial Applications.
