Plastics Technology Laboratories  
 

Tensile Tests of Rubber

ASTM D412

A2LA Accredited
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Scope:
 
Tensile tests measure the force required to break a specimen and the extent to which the specimen stretches or elongates to that breaking point.  The data is often used to specify material, to design parts to withstand application forces and as a quality control check of materials. 

Test Procedure: 
 Place specimens in the grips of the Instron at a specified gage length and pull until failure.  The testing speed is determined by the material specification.  An extensometer can also be attached to test specimen to determine elongation and tensile modulus.  

Specimen Size:
 Dumbbell or ring specimen is required.  It can be either injection molded or cut from a flat sheet. 

Data:
 The following calculations are the most common results given:
     1.     tensile strength (at yield and at break)
     2.     tensile modulus (for elastomers, this is stress at a given % strain)
     3.     strain
     4.     elongation and percent elongation at yield
     5.     elongation and percent elongation at break

There are additional calculations and a variety of units (lbs, psi, MPa, kN, etc.)

Equipment used at Plastics Technology Laboratories, Inc.:
Instron Universal Tester
Pneumatic Grips
1000% Extensometer

**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding.  For more information please contact a PTLI Technical Representative at ptli@ptli.com .  Due to copyright restrictions, we are not able to provide copies of standards.  Standards can be obtained from www.astm.org, www.iso.ch/iso/en, www.sae.org or other appropriate standards authorities.


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**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact a Intertek PTL Technical Representative at . Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

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