Multifilament Braided Rope
Durarope is a new generation, high performance, light weight, multifilament braided rope.
- Soft – easy to handle and store.
- Excellent knot retention.
- Not damaged by diesel fuel, petrol, battery acid, grease, or oil.
- Unaffected by water – can be stored wet or dry.
- Long lasting – with UV protection against sunlight degradation.
- Resistant to fungus & mildew.
Durarope is made of 100% polypropylene Duralene yarns. These yarns are made from a polyolefin of non-polar nature comprising of high molecular paraffinic hydrocarbons; it has a very high chemical resistance compared to other synthetics. It is stable towards inorganic salts and to almost all inorganic acids and alkalis even at high concentrations and at temperatures above 60c° centigrade.
The water absorption of Durarope is extremely low, both at room temperature and at 100c° centigrade. The physical properties and dimensional stability of the yarns is independent of environmental humidity.
Durarope is available from 5mm to 20mm diameters.
Durarope Climbing Ropes
Durarope climbing ropes utilize a kernmantle construction consisting of a core (kern) covered by a sheath (mantle). The core is the main load-bearing element and largely determines a rope’s characteristics, such as static elongation, maximum impact force, and strength. The sheath is braided tightly around the core and its primary purpose is to protect the core against abrasion, but the relationship between the core and sheath also helps determine a ropes handling characteristics.
Prior to World War II, all ropes were made of natural fibers, including jute, sisal, cotton, and manila. Today, all mountaineering and rappelling ropes are made of 100% nylon, or with a polypropylene core with a nylon sheath. Nylon offers the closest thing to an ideal combination of strength, resiliency, elasticity, and abrasion resistance, and is hence ideally suited for mountaineering use.
Dynamic
Ropes used for climbing are normally dynamic. They are designed to stretch when fallen on, absorbing shock and dissipating the energy generated when arresting a fall. Dynamic ropes are made of nylon, and where required the core is shrunk and stabilized by steam to increase the elongation under load and to reduce changes after becoming wet. Typical sizes range from 8 to 11mm diameter.
Static
Static ropes have relatively less extensibility. When new, the elongation at 10% of breaking strength is approximately 5%. Static ropes are used for rescue work and other applications which do not require high energy absorption.