The customer has established a new process for treating components on carts in a vacuum plasma system. These systems create a negative pressure in a vacuum chamber to modify the surfaces of the components. A process gas (like O2) is fed into the vacuum chamber at a pressure of approximately 0.1 mbar. When the process is complete, the chamber is ventilated and the modified component is removed. The castors must be capable of withstanding temperatures of up to 212 °F and a maximum load of 375 lbs. per castor. The customer wanted to keep using their existing carts with a wheel diameter of 5 inches, but wanted to ensure that no “external” issues, e.g. a chemical reaction involving the lubricants used for the existing castors, would interfere with the delicate process.