Sheet piles are driven by vibratory hammer blows, the impact of debris, and other stray blows
from miscellaneous incidents. Impact strengths are quantified by assessing the material's
resistance to a swinging hammer blow (ASTM D 256 or Izod test) or a weight drop test (ASTM
D 4226 or Drop dart test). The measure of energy indicates the resistance of the material to the
impact force. Currently there exists no standard on any acceptable minimum values for the impact
strength. User experience with PVC in resisting impact sheet piling applications for over ten
years remains satisfactory.