With the sample held vertically by the machine and the meter in place to collect data, the tensile grips begin expanding in opposite directions. ![]() ![]() These shapes are all variants on a dumbbell design, with large ends that will be held by the machine while it stretches the piece. To assess plastic tensile strength, you first cut or mold the sample into one of five designated shapes, which you choose based on its thickness and rigidity. The ASTM D638 test method is relatively simple. As plastic is lightweight and resilient, manufacturers use this material to make a wide variety of products with varying requirements and specifications. ![]() ![]() Designed to determine the tensile strength of both reinforced and non-reinforced plastics, ASTM D638 is a common but crucial industrial testing standard for evaluating a material's mechanical strength.
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