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Polyurethane Durometer Specifications

Urethane Durometer Specs

The Truth About Durometer

The durometer of urethane, the measurement of its hardness and the range at which it can be produced, is extremely versatile. Did you know that urethane’s durometer can range from as soft as a marshmallow to as hard as a bowling ball?

PSI Urethanes’ custom formulations span three different durometer scales, offering a full range of hardness not available from most urethane suppliers. View our polyurethane durometer specs below.

Polyurethane Properties & Technical Specs

Durometer Scales

  • Shore OO – Used for extremely soft materials
  • Shore A – Used for most rubbers and other elastomers (most common scale)
  • Shore D – Used for harder materials including many rigid plastics

Although a durometer is a general indicator of other physical properties, it by no means reflects the amazing versatility of urethane. Physical properties such as rebound, shock absorption, temperature resistance, chemical/water resistance, flex strength, and stretchability may be more important than hardness.

Let PSI custom formulate your product so it has the right physical properties for the job.

Durometer Reference Calculator
Durometer Chart
Select Durometer
Select Hardness
shoe icon

For reference, this hardness is as soft as a Gel Shoe Insole

rubber band

For reference, this hardness is as soft as a Rubber Band

eraser icon

For reference, this hardness is as soft as a Pencil Eraser


For reference, this hardness is as soft as a Tire Tread

shopping cart icon

For reference, this hardness is as soft as a Shopping Cart Wheel

hard hat icon

For reference, this hardness is as soft as a Hard Hat

Typical Properties of Compound Formulas – Shore OO

Durometer (ASTM D2240)25-OO40-OO50-OO
Tensile Modulus, PSI (ASTM D412)
Tensile Strength, PSI (ASTM D412)4099198
Elongation at Break % (ASTM D412)791627688
Tear Resistance (lb/in.)
Die C (ASTM D624)61321
Split Tear (ASTM D470)233
Compression Set % (ASTM D395B)412
Resilience (Rebound %) (ASTM D2632)202632

Typical Properties of Compound Formulas – Shore A

Durometer (ASTM D2240)40A50A60A70A80A90A
Tensile Modulus, PSI (ASTM D412)
Tensile Strength, PSI (ASTM D412)408352872466467141405192
Elongation at Break % (ASTM D412)655620835720637405
Tear Resistance (lb/in.)
Die C (ASTM D624)211228219386484670
Split Tear (ASTM D470)24375311513785
Compression Set % (ASTM D395B)5451354527
Resilience (Rebound %) (ASTM D2632)7440393146

Typical Properties of Compound Formulas – Shore D

Durometer (ASTM D2240)50D60D70D
Tensile Modulus, PSI (ASTM D412)
Tensile Strength, PSI (ASTM D412)460151496799
Elongation at Break % (ASTM D412)502261205
Tear Resistance (lb/in.)
Die C (ASTM D624)84010881349
Split Tear (ASTM D470)197201207
Compression Set % (ASTM D395B)433850
Resilience (Rebound %) (ASTM D2632)433742

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