Wanda Polyurethane on Aluminium Caster with our High Quality Poly on Aluminum Wheels are used in many applications where the casters and wheels are exposed to water or chemicals. Aluminum is resistant to rust and provides a very strong core for the liquid cast polyurethane tread. Polyurethane on Aluminum wheels are used in Food Processing Equipment, Food Service, Hospitals, Research Laboratories, Pharmaceutical Laboratories, Bakeries, Schools, Institutional, and industrial applications and environments.