1.1 This test method covers the determination of the linear density of all types of yarn in package form, subject to the limitations of size and stretch given in and . Provision is made for expressing yarn linear density in all the traditional yarn numbering systems.1.2 This method is applicable to yarns that stretch less than 5 % when tension on the yarn is increased from 0.25 to 0.75 cN/tex (0.25 to 0.75 gf/tex). By mutual agreement, and use of a lower than specified reeling tension