Plastics Technology Laboratories  
 

Extensometers for Tensile Testing of Plastics and Rubbers

Extensometers for Tensile Testing of Plastics and Rubbers
ASTM D638, D882, D412, ISO 527

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Extensometers for Tensile Testing of Plastics and Rubbers close-up


Scope:
Although standard test equipment allows the use of crosshead displacement to calculate the elongation of a tensile test specimen, much greater accuracy is achieved by direct measurement using an extensometer. In addition, tensile modulus determinations generally require the use of an accurate extensometer. Typical extensometers for plastics mount directly on the test sample, and will record elongation up to various amounts - which is more than enough to accurately determine the yield point and modulus of the material. If the test sample has not failed by the time maximum elongation of the extensometer is reached, the extensometer is removed and the machine uses crosshead movement to continue calculating elongation.

For rubbers and elastomers, accurate measurement of much greater elongations may be necessary and a self-supporting 1000% extensometer is used.

Equipment used at Plastics Technology Laboratories, Inc.:
Universal Tester
Contact Extensometer
Self-supporting Extensometer


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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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