The amount of fiber collected after its elasticity and elasticity is stretched. To measure the ability to stretch the fibers, they drag it down to the size of the two sides and let it go back to the initial situation. The difference between the length of the tar stretched and the collected blur is called the “the remaining discovery” of some fibers as follows: 1 x 35 to 45 percent. 6 to 7 percent. 3.6%.