Rubber and Elastomer Tensile Strength Test - ASTM D412

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• published: 16 Apr 2010
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This shows a tensile strength and elongation test appropriate for rubbers, elastomers, and silicones, and performed according to ASTM D412 on an ADMET universal testing machine. For more information on the test and equipment visit http://info.admet.com/specifications/bid/34241/ASTM-D412-Tensile-Strength-Properties-of-Rubber-and-Elastomers Testing the Tensile Properties of Plastics and Elastomers Summary of Test ASTM D412 covers the testing of 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 ASTM D412 is right for you and to point out what equipment you need to perform the test. CLICK TO CONTACT US Or call us at (800) 667-3220 Test Procedure To perform this test, cut your material into a “dogbone” shaped sample. Load the sample into a pair of tensile grips suitable for elastomers and attach your extensometer (if you have one). Begin the test by separating the tensile grips at a rate specified in the standard and run until sample break (rupture). Calculations: Stress at User-Specified Extension or Elongation Tensile Yield Stress Tensile Yield Strain Tensile Strength at Rupture Elongation at Rupture Equipment Required for ASTM D412 A Universal Testing Machine with the following specifications: Servo-control to ensure constant rate of speed during the test (+/- 2 inches per minute) At least 30 inches of crosshead travel or more for higher elongation materials A load capacity of at least 1kN ADMET Recommends: eXpert 2600 Dual Column Testing Machine, eXpert 7600 Single Column Testing Machine An extensometer is optional but recommended. We recommend using an extensometer for two reasons: Dogbone specimens do not have uniform widths which can cause errors when both the wide and narrow sections of the dogbone shaped specimen elongate at different rates Elongation is usually an important design characteristic of rubbers and elastomers so an extensometer can be used to improve accuracy of the measurement ADMET Recommends: Extensometers Software or suitable electronics are required to operate the machine and to take the measurements Basic systems will provide the raw data and stress-strain charts. Using these data, you can determine and calculate all of the analyses listed above. Fully PC-based systems have the capability to calculate all of these automatically. ADMET offers both ADMET Recommends: MTESTQuattro PC-based Controller Tensile grips hold your specimen during the test as it is being pulled apart Elastomers pose a challenge to hold because they thin as they are pulled axially. Therefore, the vast majority of elastomers need to be held with self tightening grips such as wedge, pneumatic, or eccentric roller design. ADMET Recommends: Self-tightening Tensile Grips, Wedge Grips, Pneumatic Grips