ASTM D2731Standard Test Method for Elastic Properties of Elastomeric Yarns (CRE Type Tensile Testing Machines)
ASTM D2731 is a test method for determining the elastic properties of elastomeric yarns made from rubber, spandex or other elastomers. Elastic properties include force at specified elongations, permanent deformation and stress decay. Other hysteresis related properties can be calculated.
Before conducting ASTM D2731, it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.