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Impact performance is also commonly oversimplified. Notched Izod or Charpy impact values are often used to represent toughness, yet these tests are highly sensitive to notch geometry and specimen dimensions. In real molded parts, weld lines, fiber orientation, and local stress concentrations are far more complex than standardized notches. Engineering experience shows that a high impact number does not necessarily translate into reliable drop resistance or vibration durability.
From an engineering validation perspective, mature material selection processes are shifting from single-value comparisons toward operating-condition mapping. This approach aligns real service temperature, humidity, and load profiles with corresponding test conditions, and when necessary, includes secondary testing or pilot molding trials. Although this method increases upfront effort, it significantly reduces systemic risk during mass production.
