ASTM D412 and ISO 37 are great tensile test methods to measure stress-strain characteristics of natural rubber, synthetic rubber, silicone rubber, and Thermoplastic Elastomers (TPE’s). Both ASTM D412 and ISO 37 specify the test method details to determine tensile stress strain properties of molded and die cut rubber and elastomers. ASTM D412 has two parts: Method A and Method B. Method A is made for vulcanized rubber and TPE dumbbell-shaped samples. On the other hand, test Method B is made specifically for rubber rings. Rubber and elastomers both feature high extensibility and so extensometers are typically required to accurately measure elongation or stretch while loading is applied. An application engineer can assist in the selection of the best grip and jaw face for rubber tests. Pneumatic air grips with serrated or rubber coated faces are common. A constant gripping force can prevent specimen slippage when specimens elongate. Self tightening grips, such as roller grips are also adequate for rubber tests. TestResources test machines offer high speed servocontrol technology to ensure constant rate of extension (CRE) which is especially important in testing rubber.

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