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Polypropylene


Monofilament Polypropylene is the lightest, most widely used, and most economical rope on the market.  Next to polyethylene it is the weakest of the common synthetic fibers, though it is still much greater than the natural fibers, such as Manila or Sisal. Other beneficial characteristics are long life, ease of handling, flexibility in cold temperatures, excellent resistance to most acids and alkalis, and good impact loading. Polypropylene has the tendency to degrade quite rapidly when exposed to sunlight, thought the addition of UV stabilizers can retard this degradation. Polypropylene’s specific gravity is below one (0.91), allowing it to float. The low melting point of Polyethylene, around 166 C (330 F) makes it an unsuitable rope for high temperature applications. The rope should not be used in applications where the temperature gets above 120 C (250 F).

Polypropylene fibers used in ropes come in two distinct types, monofilament and multi-filament. These names refer to the diameter of the fibers or denierMono-filament are those fibers above 50 denier, and multifilament for those below.