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.

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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

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

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

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

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

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

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

Typical Properties of Compound Formulas – Shore OO

Durometer (ASTM D2240)	25-OO	40-OO	50-OO
Tensile Modulus, PSI (ASTM D412)
100%	3	8	13
300%	7	16	27
Tensile Strength, PSI (ASTM D412)	40	99	198
Elongation at Break % (ASTM D412)	791	627	688
Tear Resistance (lb/in.)
Die C (ASTM D624)	6	13	21
Split Tear (ASTM D470)	2	3	3
Compression Set % (ASTM D395B)	4	1	2
Resilience (Rebound %) (ASTM D2632)	20	26	32

Typical Properties of Compound Formulas – Shore A

Durometer (ASTM D2240)	40A	50A	60A	70A	80A	90A
Tensile Modulus, PSI (ASTM D412)
100%	174	221	229	409	654	1236
300%	298	386	321	609	1043	2299
Tensile Strength, PSI (ASTM D412)	4083	5287	2466	4671	4140	5192
Elongation at Break % (ASTM D412)	655	620	835	720	637	405
Tear Resistance (lb/in.)
Die C (ASTM D624)	211	228	219	386	484	670
Split Tear (ASTM D470)	24	37	53	115	137	85
Compression Set % (ASTM D395B)	5	4	51	35	45	27
Resilience (Rebound %) (ASTM D2632)	7	4	40	39	31	46

Typical Properties of Compound Formulas – Shore D

Durometer (ASTM D2240)	50D	60D	70D
Tensile Modulus, PSI (ASTM D412)
100%	1646	3376	4842
300%	2511	N/A	N/A
Tensile Strength, PSI (ASTM D412)	4601	5149	6799
Elongation at Break % (ASTM D412)	502	261	205
Tear Resistance (lb/in.)
Die C (ASTM D624)	840	1088	1349
Split Tear (ASTM D470)	197	201	207
Compression Set % (ASTM D395B)	43	38	50
Resilience (Rebound %) (ASTM D2632)	43	37	42