How does the coefficient of friction of polyethylene compare to other plastics?

Polyethylene is widely recognized for its low coefficient of friction, making it a preferred choice for applications requiring smooth sliding or reduced wear. Compared to other common plastics like PVC, nylon, or PTFE (Teflon), polyethylene typically exhibits a lower static and dynamic friction coefficient, especially in its high-density (HDPE) and ultra-high-molecular-weight (UHMWPE) forms.

For instance, UHMWPE has a coefficient of friction as low as 0.10–0.20, which is comparable to PTFE but with better wear resistance. In contrast, materials like nylon or PVC often have higher friction values (0.25–0.50), making them less ideal for low-friction uses. Polyethylene's self-lubricating properties further enhance its performance in mechanical parts, conveyor systems, and medical implants.

However, PTFE still outperforms polyethylene in extremely low-friction scenarios, though it lacks polyethylene's durability. Understanding these differences helps engineers select the right plastic for specific friction-sensitive applications.