Urethane Rollers

Urethane & Polyurethane Technical Brief

The Truth About Durometer

Download Urethane Technical Brief

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.

PSI Urethanes’ durometer scales include:

  • 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 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.

Typical Properties of Compound Formulas – Shore OO

Durometer
(ASTM D2240)
25-OO40-OO50-OO
Tensile Modulus, PSI
(ASTM D412)
100%3.059.0614.6
200%7.3315.824.2
300%14.222.735.5
Tensile Strength, PSI
(ASTM D412)
86.5167273
Elongation at Break %
(ASTM D412)
865763706
Tear Resistance (lb/in.)
Die C
(ASTM D624)
8.8717.321.4
Compression Set %
(ASTM D395B)
0.000.000.00
Resilience (Rebound %)
(ASTM D2632)
253039

 

Typical Properties of Compound Formulas – Shore A

Durometer
(ASTM D2240)
40A50A60A70A80A90A
Tensile Modulus, PSI
(ASTM D412)
100%1422162853703751100
200%202297
300%25938143047011202100
Tensile Strength, PSI
(ASTM D412)
469162064320545045004500
Elongation at Break %
(ASTM D412)
692573760700585450
Tear Resistance (lb/in.)
Die C
(ASTM D624)
140159195260345400
Split Tear
(ASTM D470)
2228427010075
Compression Set %
(ASTM D395B)
161751363527
Resilience (Rebound %)
(ASTM D2632)
224322145

 

Typical Properties of Compound Formulas – Shore D

Durometer
(ASTM D2240)
50D60D70D
Tensile Modulus, PSI
(ASTM D412)
100%210033404342
200%39775677
300%4400
Tensile Strength, PSI
(ASTM D412)
680063467391
Elongation at Break %
(ASTM D412)
329262
Tear Resistance (lb/in.)
Die C
(ASTM D624)
785754983
Split Tear
(ASTM D470)
120
Trouser
(ASTM D1938)
314295
Compression Set %
(ASTM D395B)
284145
Resilience (Rebound %)
(ASTM D2632)
424542
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