Plastics can become subjected to rapid stress or impact loads and it is important to quantify how different plastic materials can withstand such impact loads. Two of the most common methods are the so-called Izod and Charpy (pendulum) impact tests.
ISO 6603-2 - Instrumented Falling weight (IFW)
ISO 179-1 - Charpy Impact strength, unnotched or notch A, B or C
ISO 180 - Izod Impact strength, unnotched or notch A, B