Selecting the right thermoplastic for your custom PCB enclosure depends on your environment. **ABS** and **PC/ABS** are industry standards for impact resistance and easy machining. For high-clarity or extreme heat, **Polycarbonate (PC)** is ideal, while **PVC** offers superior chemical resistance and flame retardancy. **HIPS** provides a cost-effective, lightweight solution for prototypes and low-stress applications.