It says:
I wonder if that means they trade a bit of stiffness for toughness, in which case it sounds like ePC, which definitely isn't as stiff as PC-Plus but feels like it has better impact resistance.Polymaker PC-Max™ offers the absolute best in toughness that is simply unobtainable from other 3D printing materials of similar stiffness. This makes Polymaker PC-Max an excellent choice for real-world, engineering applications.
~Justine