How to Read This Guide
Wheel material is the specification that most often gets defaulted rather than decided — and it is the one most responsible for marked floors, premature wheel failure, and excessive push force. This guide compares each material on the four properties that actually matter in a facility: floor compatibility, load capacity, temperature/chemical resistance, and noise. If you are speccing a caster end-to-end, start with the caster buying guide and size the load with the load capacity calculator first.
Polyurethane (PU)
Polyurethane is an elastomer molded — and on quality casters, chemically bonded — to a rigid core. It is the workhorse tread for healthcare, hospitality, and food service because it is non-marking, quiet, durable, and resists oils and many cleaning chemicals. It carries more load than rubber and protects premium flooring. Its main weakness is flat-spotting: left under a heavy static load for days, a soft PU wheel deforms permanently. Specify a higher durometer for equipment that parks.
Thermoplastic Rubber (TPR)
TPR keeps the quiet, floor-protective feel of rubber while being non-marking and more consistent than natural rubber. It is the standard upgrade from black rubber in healthcare and retail. It carries less load than polyurethane, so it suits lighter carts and quiet-zone equipment rather than heavy transport.
Nylon
Nylon is a hard, rigid wheel with very high load capacity and excellent chemical resistance. It rolls with low resistance on smooth concrete and epoxy, which is why it dominates warehouse and industrial use. The trade-off: it is loud and will mark or damage soft floors, so it is wrong for clinical and hospitality spaces.
Phenolic Resin
Phenolic is a resin-and-fiber composite built for temperature extremes — cold storage through high-temperature ovens. It carries high loads and resists most chemicals, but it is very hard, very loud, and damages most floors. It belongs on concrete in industrial and cold-chain environments only.
Standard Rubber, Cast Iron, and Stainless Steel
Standard rubber is quiet and cheap but low-capacity, degrades with oils, and (in black form) marks light floors — fine for light-duty or outdoor use. Cast iron and stainless steel wheels handle extreme loads or fully sanitizable wet/sterile environments respectively; both are very loud and will damage any soft floor, so they are specialized choices, not general-purpose treads.
Polyurethane vs Rubber: Which Should You Choose?
Choose polyurethane for almost all commercial and healthcare work: it carries more load (up to roughly 1,200 lbs per caster vs around 400 for rubber), resists oils and chemicals, and lasts longer. Choose rubber when maximum quiet and shock absorption matter more than load, in light-duty or outdoor settings, or where budget is the deciding constraint. For floor-protection-critical settings, see the floor protection casters guide.
Nylon vs Polyurethane for Industrial Applications
On smooth concrete with very heavy loads, nylon offers the lowest rolling resistance and the highest capacity. But nylon transmits shock and is loud. Polyurethane-on-iron (a PU tread over a cast-iron core) is the common compromise for industrial equipment that also crosses floor joints or operates near staff — high capacity with far better floor protection and noise. See the industrial caster guide for load-class specifics.
Phenolic vs Nylon for High-Temperature Use
Both tolerate heat, but phenolic handles higher sustained temperatures (to roughly 500°F vs around 250°F for nylon) and resists more chemicals. Nylon is quieter and slightly kinder to floors. For oven and autoclave-adjacent equipment, phenolic is usually correct; for warm-but-not-extreme industrial use, nylon is sufficient.
Material Selection by Industry
- Healthcare — polyurethane or TPR (non-marking on LVP is effectively mandatory). See the healthcare caster guide.
- Hospitality — polyurethane or TPR for quiet rolling on marble and tile. See the hospitality caster guide.
- Food service — polyurethane or stainless steel for NSF-compliant, washable, chemical-resistant equipment. See the food service caster guide.
- Industrial — nylon, polyurethane-on-iron, or phenolic depending on load and temperature. See the industrial caster guide.
- Caribbean / coastal — corrosion-resistant polyurethane on stainless hardware. See the Caribbean caster guide.