Hardness (also called Durometer)
A material’s resistance to localized deformation
Why It Matters
Polyurethane has a wide range of hardness from very soft, like a gel bicycle seat (~25 Shore OO), to very hard, like a bowling ball (~75 Shore D). But the sweet spot for many of its performance properties occurs from 55 Shore A to 75 Shore D. This is where we tend to see the most potential for polyurethane.