*3.1.4 Impact strength*

Impact strength can be defined as the capacity of a test polymer sample to withstand fracture when a sudden force is applied to it. It is the energy absorbed by this sample without breaking. The most frequent tests for plastic materials are the drop-weight test, the Izod Impact Test, and the Charpy Impact Test. Both approaches assess a PE test sample's capacity to absorb energy upon failure. PE's Izod impact resistance values range from 0.534 to 0641kj/m at ordinary room temperature. It determines how brittle or rigid material will be when subjected to a suddenly applied load. It is affected by the volume of the specimen, the presence of a notch, cold working, and water absorption in a polymer [20].
