How does the resistance to scratching from metal tools vary among these plastics?

The resistance of plastics to scratching from metal tools varies significantly based on polymer composition and surface hardness. High-performance plastics like polycarbonate (PC) and acrylic (PMMA) demonstrate superior scratch resistance due to their rigid molecular structures. Engineering plastics such as nylon (PA) and polyethylene (PE) show moderate resistance, while softer plastics like polypropylene (PP) are more prone to visible marks. Factors like additive coatings and fiber reinforcement can further enhance scratch protection. For applications requiring frequent metal contact, selecting plastics with high Rockwell hardness ratings ensures long-term surface integrity. Laboratory tests using standardized scratch protocols reveal that cross-linked polymers generally outperform thermoplastic varieties in scratch resistance scenarios.