ASTM D3106Standard Test Method for Permanent Deformation of Elastomeric Yarns
This test method covers the determination of the permanent deformation of bare, continuous elastomeric monofilaments and filament yarns made from rubber, spandex, anidex, or other elastomers subjected to prolonged periods of tension. This test method is applicable to elastomeric yarns having a linear density in the range from 4 to 320 tex (36 to 2900 den.)
Before conducting ASTM D3106, it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.