4 Apparatus 4.1 Falling-weight testing machine, incorporating the following basic components {see figure 1). 4.1.1 Main frame, with guide rails or a guiding tube rigidly fixed in the vertical position, to accommodate a striker (4.1.2) and release it to fall vertically and freely. When calibrated, the speed of the striker at the moment of impact … Continue reading ISO 3127 Thermoplastics Pipes – Determination of Resistance to External Blows – Round-the-Clock Method