How to Choose High-Quality Polyurethane Casters?

How to Choose High-Quality Polyurethane Casters
To select reliable polyurethane casters, it's important to focus on four core aspects: material performance, structural design, parameter compatibility, and regulatory compliance. This can prevent quality issues from shortening the product's service life or causing safety hazards. Specific methods are as follows:

1. Prioritize the quality of the polyurethane wheel core.
The wheel core is the core load-bearing component, and its quality should be determined by inspection, touch, and testing. Check the wheel surface for smoothness, free of bubbles or cracks. High-quality polyurethane wheels have an even, flawless surface, while low-quality wheels are prone to dents or impurities. Check the wheel surface for hardness by lightly pressing with your fingernail. Good elasticity and no noticeable indentations are preferred (typical hardness is 65-95 Shore A; request a hardness test report from the manufacturer). Test wear resistance by lightly rubbing the wheel surface with sandpaper. High-quality wheels only show minor wear, while low-quality ones tend to chip or fuzz. Also, confirm that the wheel core is solid. Hollow wheels have poor load-bearing properties and are prone to deformation. Solid wheels are more durable and are particularly suitable for heavy-duty applications.

2. Check the structural strength of the bracket and bearings.
The bracket and bearings determine the stability of the caster. Key considerations include: Preferable bracket materials include SUS304 stainless steel or thickened cold-rolled steel (thickness ≥ 3mm). Use magnets for attachment. Stainless steel brackets are non-magnetic (SUS304), while cold-rolled steel brackets have strong attachment. Avoid thin sheet metal brackets (which are prone to bending). Choose sealed bearings (such as 2RS rubber seals). Manually rotate the wheel; it should be smooth, without sticking or noise. Shake the wheel; there should be no noticeable play (≤0.5mm). Poor-quality bearings have high rotational resistance and are prone to making a clicking sound.

3. Key Parameters to Match Actual Requirements
Mismatched parameters can easily lead to caster failure, so precise verification is essential. The load capacity is calculated as "total equipment weight / number of casters × 1.2" (allowing a 20% safety margin). For example, for equipment weighing 800kg, select four casters with a rated load capacity of at least 240kg. The wheel diameter is selected based on the flatness of the floor: 50-100mm for flat surfaces and 100-200mm for uneven surfaces (larger wheel diameters make it easier to navigate obstacles). The braking system (if any) must be tested for sensitivity; the wheels should fully lock when the brakes are applied, with no slippage or looseness.

4. Confirm Compliance and Brand Assurance
Prioritize branded and certified products. For food/pharmaceutical applications, confirm that the wheel body complies with food-grade certifications such as FDA and EU 10/2011 to avoid material migration and contamination. Request a quality inspection report from the supplier, including oil, acid, and alkali resistance test data (high-quality wheels should withstand 72 hours of oil immersion without deformation). Choose brands with comprehensive after-sales service. If problems such as wheel cracking or bearing failure occur, timely returns or repairs are provided to avoid after-sales service issues.