What 2 properties of Teflon make it valuable in the construction of artificial joints for human limbs?

Teflon, or polytetrafluoroethylene (PTFE), is valuable in the construction of artificial joints due to its exceptional low friction properties and biocompatibility. The low friction reduces wear and tear on the joint surfaces, enhancing durability and function. Additionally, its biocompatibility minimizes the risk of adverse reactions in the body, making it suitable for long-term implantation in human limbs.