Will injection-molded polyurethane casters deform if left stationary for an extended period? What should be considered when selecting them?

Time：May 19,2026

Injection-molded polyurethane casters are widely used in hand trucks, pallet jacks, equipment bases, and other applications thanks to their wear resistance, smooth rolling, and low operating noise. However, in practical use, many people focus primarily on their performance during movement while overlooking a crucial issue: if the equipment remains stationary for extended periods, the polyurethane casters can deform, which may subsequently compromise their functionality.

These issues are not due to “poor product quality,” but rather stem from the inherent properties of polyurethane materials. As an elastic material, polyurethane exhibits a certain degree of stress relaxation and creep under prolonged compressive loading. Simply put, when casters remain pressed against the same contact point for an extended period, the localized area gradually hardens, its resilience diminishes, and the surface may become flattened; in severe cases, cracking or chipping can occur.

From the perspective of usage patterns, injection-molded polyurethane casters are better suited for equipment that is frequently moved. During rolling, the contact point between the wheel surface and the floor continuously shifts, distributing the load more evenly; as a result, wear typically manifests as uniform abrasion rather than localized crushing. This helps maintain the caster’s elasticity and ensures a more consistent service life.

For this very reason, whether the equipment will be frequently moved is a critical factor that must be considered during the selection process.

Why does prolonged standing cause deformation?

When a piece of equipment remains stationary for an extended period, the casters’ wheel faces bear the equipment’s weight at the same location, resulting in sustained localized pressure. Over time, the internal structure of the polyurethane may change, leading to increased hardness and reduced elasticity in that area.

If the dwell time continues to lengthen, localized fatigue will further accumulate, potentially giving rise to microscopic cracks within the material. Once the equipment resumes motion, these damaged areas become more susceptible to cracking, edge chipping, or localized spalling.

Why are injection-molded polyurethane casters more suitable for mobile devices?

For hand trucks, logistics trolleys, and work‑in‑process equipment that requires frequent repositioning, injection‑molded polyurethane casters remain an excellent choice. They offer superior wear resistance, low rolling resistance for effortless movement, and also provide a degree of quiet operation.

Under these operating conditions, the load on the caster wheel surface fluctuates continuously, preventing prolonged pressure at a single point; as a result, the polyurethane material’s advantages in wear resistance and service life are better realized.

How should long-term idle equipment be selected?

If the equipment remains stationary for most of the time—such as on shelves, display racks, workbenches, or on a base that is parked long-term—it is not advisable to rely solely on injection-molded polyurethane casters for sustained heavy loads.

Scenarios like these are better suited to equipment with support feet, or to products like Fuma wheels that feature built-in support. When stationary, Fuma wheels typically rely on a rubber base or supporting structure to bear the load, allowing the wheel body to lift off the ground. This prevents prolonged pressure on the wheel surface, thereby reducing the risk of deformation.

When selecting a model, it’s recommended to pay particular attention to the following points.

First, determine whether the equipment will be “frequently moved” or left in a “fixed position for an extended period.” If mobility is the primary consideration, prioritize injection-molded polyurethane casters; if stability is paramount, opt for support feet or wheels with supporting structures.

Second, risk should be assessed in conjunction with the equipment’s total weight and its downtime. The heavier the equipment and the longer it remains stationary, the greater the likelihood of localized deformation of the polyurethane wheel tread.

Third, select an appropriate solution based on the actual operating environment. If the equipment needs to be moved occasionally but is typically stationary, a combination of casters and support brackets is usually the more reliable choice.

Summary

Injection-molded polyurethane casters perform exceptionally well in mobile applications, but they are not suitable for every operating condition. For equipment that requires frequent movement, they strike a balance between wear resistance, ease of maneuvering, and quiet operation; however, for equipment that remains stationary for extended periods, special attention should be paid to preventing deformation caused by prolonged pressure on the wheel surface.

When selecting casters, don’t rely solely on the material and load‑capacity ratings; consider how the equipment will be used as well. Choosing the right product not only extends the caster’s service life but also reduces future maintenance and replacement costs.