GWP 1 x 600 3 Strand Yellow and Black Polypropylene Rope (12,825 lbs. Tensile Strength). Polypropylene is a lightweight and strong general-purpose rope. It is rot proof and unaffected by water, oil, gasoline, and most chemicals. Polypropylene floats yet it is twice as strong as manila. Our regular film polypropylene rope is made with a medium lay, allowing for easy splicing.