Extensometers for Tensile Testing of Plastics and Rubbers
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ASTM D638, D882, D412, ISO 527
A2LA Accredited
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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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