Polypropylene is the lightest and most economical synthetic rope, with approximately twice the tensile strength of manila. Polypropylene rope will not rot or mildew, is resistant to most chemicals and acids, floats in salt and fresh water, and can be stored wet. Standard color is yellow with a black tracer. Other colors available through special order. Diameters below 1 1/2″ diameter are constructed using a three stage process and 1 1/2″ diameter and above are a four stage plied yarn construction. Premium polypropylene meets or exceeds Cordage Institute specifications.