Polyurethane Durometer

A material’s resistance to localized deformation

Why It Matters

Polyurethane delivers excellent performance across a hardness range that spans from approximately athletic shoe sole (low hardness) to bowling ball (high hardness). Polyurethane’s hardness range straddles typical rubber and plastic hardnesses. Many applications – from shock absorbers to wheels to wear pads – take advantage of polyurethane’s unique combinations of performance and hardness. Polyurethane durometer is another way of saying polyurethane hardness.
Hardness is an indicator of a material’s modulus. But hardness alone is not a good specifier of a polyurethane’s overall performance. Different polyurethane formulations can have the same hardness, yet have a very different set of performance properties. So don’t rely on just hardness to specify a polyurethane.
Polyurethane’s durometer is dependent on the specifics of the formulation. We can tailor the polyurethane’s hardness to fit your specific need.


Hardness is a dimensionless quantity. Polyurethane durometer, or hardness, is measured on various overlapping scales. The most popular scales for measuring polyurethane hardness are Shore A and Shore D. Shore OO or Rockwell R scales might be used for very low or very high hardness measurements, respectively. Converting between hardness scales is not recommended.
Shore scales range from 0 (soft) to 100 (hard). An instrument called a durometer measures Shore hardness. It forces a conical-shaped indenter into the surface of the material and then measures the depth of the indentation. The material’s hardness is inversely related to the depth of penetration. ASTM D-2240  Standard Test Method for Rubber Property – Durometer Hardness – further describes the process for measuring hardness.

Typical Values

Urethane’s hardness has a wide range 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.

durometer hardness scale

We collaboratively design, precisely mold, and dependably deliver polyurethane components that improve your product’s performance.

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