Fibrillated polypropylene filler yarn is a type of synthetic yarn used in the production of cables and ropes. It is made by fibrillating or splitting polypropylene fibers into smaller, ribbon-like strands that are then twisted together to form a yarn. Fibrillated polypropylene filler yarn is lightweight and strong, and is often used as a filler material in the cores of cables and ropes to provide added strength and support. It is also commonly used in the construction industry as a reinforcing material in concrete and other building materials. Fibrillated polypropylene filler yarn is resistant to moisture, chemicals, and UV radiation, making it a durable and long-lasting material for a variety of applications.