Before we jump into the impact testing experiment, lets start by defining “youghness” as the impact testing is the only means of measuring materials property. Toughness is the amount of energy required to cause a material or test piece to fracture or fail. More the energy required, the tougher the material is. The area under the stress-strain curve from a tensile test is the measure of toughness of our test piece in slow loading conditions. However, in context of an impact testing, we will be looking at notch toughness (a measure of materials to brittle or fast fracture in presence of a flaw and fast loading conditions). Impact testing techniques were established to determine the fracture characteristics of materials. From the laboratory results of tensile tests, it was hard to extrapolate those results and determine or predict the fracture behavior. For example, under some circumstances, ductile materials fracture abruptly and with little plastic deformation. Impact test conditions were chosen to represent those most severe relative to the potential for fracture, namely, deformation at low temperature and the high strain rate i.e the rate of deformation. This impact lab experiment is conducted using the Charpy technique to measure the impact energy of the specimen, the relative susceptibility of plastic and metallic materials to fracture by sudden flexural stress. By using a standard pendulum, we are going to break the specimen in a single impact. If the sample breaks, the change in energy of the pendulum is the measure of the energy needed to break the specimen which is noted down. 1. Swinging pendulum rigidly attached to a solid metal base which is, in turn, firmly mounted on a bench top. This is shown in figure 1. 2. Hounsfield Plastic Impact Machine. This is shown in figure 2. 3. Specimens of PVC, HDPE and metals that are at different temperatures. Our impact testing has two procedures. We are going to conduct experiment