Introducing the new NBI Specialised Dynamic Rope



We’re excited to share that our NBI Specialised Rope range has expanded! Our latest addition is the 10.5mm dynamic rope, made with a nylon outer and high elongation nylon inner composition.

The rope provides a dynamic elongation of 28.5%, fall arrest impact of 10.7N, and tensile strength of 2152 Kg. These excellent performance capabilities make it the reliable choice.

Our speciality ropes are rigorously tested to ensure they meet the highest safety standards and are suitable for use in a variety of applications. Our dynamic rope is CE certified to meet EN 892:2012 standards.  We are committed to continue providing our customers with the best quality ropes that are reliable, durable and safe. 

For more information, visit our Access Ropes webpage.

NBI Shock cord

Shock Cord

Shock cord is a very
versatile industrial cord with elastic properties, used for various
applications and is also commonly known as bungee cord, bungie cord, elastic
cord, octopus strap, kangaroo straps or occy straps in Australia.
The shock cord is constructed with an inner core of elastic or rubber strands
with an outer braided core of polyester or nylon. Specialised bungee cords like
those used for bungee jumping, are constructed differently.
Shock cords are used to secure objects without tying knots and to absorb shock.
The hooks fastened at the end of the shock cord makes this into a useful
utility item.

The elasticity and hooks are perfect for holding or strapping down small to medium objects, without tying knots. They are perfect shock absorbers and can be used on boats, car boots, trucks, buses, etc

Shock cord uses

  • Tent Pole Shock cord Peg loops
  • Outdoor clothing and sports wear
  • Day sacks
  • Tarpaulin and awning tie downs
  • Covers for trailers, cars, boats and outdoor furniture
  • Canoes, Kayaks and Small Boards
  • Trampolines
  • Indoor or outdoor use

The stretch factor depends on the product. The standard elastic shock cord has a stretch factor of 100 to 125 percent when stretched to it’s ultimate break. Other stretch factors are available in customer specific requirements.

NBI Kernmantle Static Access Rope

Rope Access


Rope access is a safe method of working at height where ropes and specialized equipment and hardware are used to gain access to and from the work area with the proper support structure. The rope access system uses 2 ropes – one is the main working rope and the second is installed parallel to the first, thus making this a committed fail safe rope.
The rope access industry is regulated by Rope Access and Fall Arrest Association (RAFAA) in South Africa and by respective national standards as well as regulation in other countries.

Rope access offers :

  • Great flexibility when using moving platforms
  • Access to otherwise impossible to reach areas
  • Adaptability to heights and tight spaces
  • Less interference with daily operations minimizing downtime
  • Versatility in that rope access can be applied to a variety of environments from confined spaces to massive structures to complicated installations
  • Efficiency as rope access systems can be easily installed and quickly dismantled
  • Cost savings as it involves fewer personnel, faster completion, less equipment and minimum downtime

Rope access is used by :

  • Engineers
  • Maintenance and operation workers
  • Construction workers
  • Painters
  • Cleaners
  • Motion picture and theatrical personnel
  • Climbers
  • Electrical and electronic installation workers

Rope access applications are :

  • Painting and construction work
  • Photography and cinematography
  • Rock scaling and anchoring
  • Geological surveys
  • Instrument installation
  • Repairs and maintenance to buildings
  • Building and structure inspections
  • Cleaning

As in any other method of work, the application of rope access should be regard as a complete system, in which planning, management, competence, ideal safety rope and suitable hardware should be given equal priority as each is dependent on the other to ensure the safety of the entire system.

Dynamic Rope by Arresta


Dynamic Rope

A dynamic rope is especially constructed for greater stretch so that energy can be absorbed from a sudden load. Example to absorb the shock of a falling rock climber. Less pressure is put on the climber and the equipment when dynamic rope is used.

Kernmantle ropes are the most common type of dynamic rope, with two distinct features – an inner core or “kern” with an outer braided “mantle”. The core supplies the key strength factor whilst the outer protects the kern and portrays the stretch factor.
Dynamic ropes are made to be supple and to resist cutting over sharp edges. They vary in width from 10 to 13mm as different widths are used for different applications.

Types of dynamic ropes

Single rope – or full rope used for sport climbing is the term used to indicate that it has the full required strength of a mountaineering rope. This rope needs to be able to withstand 5 successive falls whilst holding 80kg (average weight of a man)

Half rope – or double rope used in trad climbing, mountaineering and ice climbing because 2 ropes are used when lead climbing. The half rope is tested with 55kg mass and must be able to resist 5 successive falls

Twin rope – are thin ropes which when leading, are used as if they were a single rope, mainly for ice climbing and long alpine routes. As in the single rope, the twin rope needs to be able to withstand 5 successive falls whilst holding 80kg (average weight of a man)

Walking rope – this is actually a single twin rope used in low impact situations, for scrambling and short roping

Every dynamic rope needs to conform to specifications standards and carry a quality certification. The most stringent of them is the European standards – the ropes carry a quality certification mark known as the technical reference Standard EN (European Norm) and a CE mark which stands for Conformity to the European Directive.


Dynamic ropes are manufactured with high tenacity polyamide or polyester filament yarn. They are typically bright multi-coloured mantels usually with contrasting markings.

Fall Factor
The fall factor of access rope determines the fall resistance. The higher the fall factor, the harder the fall. The fall factor is determined by dividing the height of the fall by the length of the rope deployed.

The value of the fall factor is between 0 and 2

For dynamic rope the fall factor needs to be <1.77

NBI taking care of your rope

How to Take Care of Rope


National Braiding takes tremendous precision to manufacture rope to exacting standards and specifications. The ropes are made from high quality yarns and therefore new ropes maintain the original specification conformance. Rope can last for a long time and retain its properties should the rope have proper care.  Using a durable fabric bag to store or transport rope, prolongs its lifespan. Damaged rope can fall apart during use and cause untold damage and injury to persons and property alike. Therefore it is important to take note of the various key points required to prevent damage and replacement of rope, in general.

Unreeling new rope

Remove new rope from a reel by pulling the rope from the top of the reel whilst the reel is free to rotate. Never unreel rope from the side as it causes kinks and strand distortion.


Synthetic rope has higher recoil tendencies than natural fibre rope. Never stand in line with rope under tension – if the rope fails it can recoil with lethal force. Reverse rope ends regularly as it permits even wearing and assures a longer, useful life span.


Abrasive conditions should be avoided at all costs for rope applications and storage. Any rope can be severely damages if subjected to abrasion, sharp edges or rough surfaces. Chocks, bits, winches, drums and other surfaces must be kept in good clean condition without burrs or rust. Pulleys must be able to rotate freely and the correct size to avoid excessive wear. Do not drag rope over the ground as dirt and grit picked up by the rope can work into the strand and damage the internal fibres.


Dirt and salt cause premature wear. Frequently wash rope with fresh water and a mild detergent. Rinse thoroughly and hang out to dry.

Tensile strength

The tensile strength is the load at which a new rope, tested under laboratory conditions, can be expected to break. Age, usage, storage conditions and type of terminations (knots) will lower tensile strength

Working load

The working load for most ropes is between 5 and 20% of the listed tensile strength depending on the age and condition of the rope. When you tie a knot, it effectively cuts the tensile strength by half. The knot when tensioned, cuts the line. Whilst certain types of knots damage the line less than others, the 50% loss of tensile strength is a good general rule to adopt.


Extreme temperatures has an effect on tensile strength of the rope. The tensile strength reports are tested under normal room temperatures. Continued exposure to high temperatures can distort synthetic rope fibres and cause permanent damage. Never dry a rope in front of a fire or store the rope near a stove or heat source. The heat weakens the synthetics fibres in the rope, thus reducing the tensile strength.


Rope should be stored in a clean dry place, away from direct sunlight and extreme heat. Some synthetic rope may be severely weakened by prolonged exposure to UV rays. A notable indication of degradation is when the surface is scraped off, it results in a powder residue.


It is generally advisable to prevent exposure to chemicals where possible. Synthetic fibres have a good chemical resistance but exposure to harsh chemicals like acids, alkalis and organic solvents should be avoided. When the surface of the rope rubs off in a powder residue, can be indication of a chemical attack.

Inspection Inspect each line before using. Although it is impossible to always guarantee when the rope has to be replaced, it is imperative to check for frayed strands, broken yarns, mechanical, temperature and chemical damage. Kernmantle ropes will show “boogers” (tufts of white thread peeking through the mantle) which is a clear indication of damage to the core. Regular inspection before use is imperative to ensure that the rope is still serviceable. If there is any doubt as to the safety of the rope, replace it immediately.