Cable filling thread or PP filler rope is a type of rope made of polypropylene fibers that are twisted together to form a firm and dense rope. It is mainly used in the cable industry as a filling material to fill the gaps between the cables and ensure they are tightly packed together. This helps in improving the overall stability and mechanical strength of the cable. The PP filler rope is resistant to moisture and chemicals, making it suitable for use in harsh environments. Additionally, it is lightweight and easy to handle during cable installation.