PVC pipes are tested for impact resistance primarily by the falling weight method, which simulates impact loads rather than Charpy or Izod tests. The test conditions vary by temperature (ambient to -20°C), tup weight, and radius, affecting contact pressure and damage likelihood.
Lower temperatures approach the ductile-to-brittle transition, reducing energy absorption capacity. Larger tup radius lowers contact pressure, decreasing initial damage probability. Optimal molecular network formation during processing enhances impact resistance.