Polycarbonate is often selected when ABS is not tough enough or when a transparent engineering plastic is needed. It balances impact resistance and heat performance better than many commodity plastics, which makes it useful for covers, machine guards, lenses, and durable technical housings.
For CNC programs, the main question is usually whether the project needs optical clarity, stronger stiffness, or a more forgiving general-purpose machining plastic. That is where standard PC, black PC, and glass-filled variants start to separate.
Polycarbonate's impact resistance is roughly 250× that of glass and 30× that of acrylic, which is why it is the default choice for safety guards and transparent barriers. Its heat deflection temperature (~130 °C for unfilled grades) also exceeds ABS by roughly 35 °C, making it suitable for applications near heat sources. The main trade-off is chemical sensitivity: PC can stress-crack when exposed to certain oils, solvents, and adhesives, so material compatibility should be checked before specifying it for chemically active environments.
