PP High Strength Industrial Bag Closing Thread. These PP Bag Closing threads are widely used to close the mouth of bags and sacks in industries such as Fertilizers, Sugar, Flour Mills and Grains. The PP stitching threads are available in wide colors. The Bag closing Yarns are available in single yarns as well as multiple ply depending on the end use or applications of the client. These industrial POLYPROPYLENE Threads are manufactured following international standards of production, sophisticated machinery and quality control making them exceedingly durable, strong, flexible and of exceptional quality. Min denier : 1200 D Twisted : 2 Ply Strength : 5.5 to 6 kgf Max denier : 1700 D (840/12) Twisted : 2 Ply Strength : 8 to 8.5 kgf