Significance and Use
For Test Method D1578 for testing any spun yarn breaking strength is considered satisfactory for acceptance testing of ltd. shipments since the Method from the then informs the extensively in the trade.
This test method is not suitable for yarns that stretch more than 5% when the force is increased from 2.5 to 7.5 mN/Tex or 0.03 to 0.08 gf/denier, because (a) they require special precautions as to recogniton in reeling, and (b) the users of to yarns are more interested in their elastic behaviors at low forces than in their ultimate product strength.