|Stainless Steel Caster, Rubber Wheel|
|Zinc Plated Caster, Phenolic Wheel|
Many food, medical and laboratories use stainless steel
casters on their carts, cages and dollies because they are washed down with chemicals regularly and often steam cleaned. These industries can also not afford to have the work place contaminated by the rust. The stainless steel is much more resistant to chemicals and steam cleaning.
In cases like these, with excessive wash downs and heavy chemicals it may be simply cheaper to spend the extra money upfront, than to replace the rusted casters and wheels on a regular basis.
For most cases, zinc plated casters and wheels will be sufficient, even if they get wet on occasion, sit outdoors at times or are indoors. Some applications where stainless may be beneficial would be casters on carts that get cleaned often, or if they sit outside all of the time in inclement weather like snow or excessive rain. In industrial settings the casters and wheels are generally zinc coated for the equipment they use.