TPU Hardness Guide: The Shore A Scale

What the numbers mean

• ~50–60A – soft, like a pencil eraser.
• ~70–80A – medium, like a car tire.
• ~85–90A – hard rubber, like a shoe sole.

Flexibility = material + geometry

The same TPU part can be soft or firm depending on wall thickness and lattice structure. MJF and SLS can produce shock-absorbing lattices without supports.