How to perform an ASTM D412 rubber elastomer tensile strength test

May 24, 2010 by Debbi Cohen

ASTM D412 covers the tensile properties of thermoset rubbers and thermoplastic elastomers. The specification describes two test methods, A and B. Method A is common and can be performed on a universal testing machine (tensile testing machine). If you are going to perform this test, you should read the entire specification from ASTM. This is a quick summary to decide if this test is right for you and to point out what equipment you need to perform the test.

This video shows the basic steps necessary to perform the ASTM D412 test:

Test Procedure:

1. Cut or injection mold your material into a "dumbbell" shaped specimen.

2. Load the specimen into tensile grips.
3. Attach the optional extensometer to the sample<./li>
4. Begin the test by separating the tensile grips at a speed of 20 inches per minute.
5. End the test after sample break (rupture).

Analysis obtained:

1. Stress at user-specified extension or elongation
2. Tensile Yield Stress
3. Tensile Yield Strain
4. Tensile Strength at Rupture
5. Elongation at Rupture

Equipment required:

1. Universal testing machine (tensile testing machine) with these minimum specifications:
   A. Servo-controlled to keep a constant rate of speed during the test (+/- 2 inches/min)
   B. At least 30 inches of crosshead travel or more for high elongation materials
   C. Most small and common 1kN (225 pound) load capacity machines will work for the loads of the materials tested to this specification

   All of our eXpert 2600 series dual column machines meet these requirements and it is also common to use our single column eXpert 7601 XLT with 53 inches of crosshead travel.

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