5 essential tips for properly using shock cords outdoors

Versatility is perhaps one of the single most defining aspects of shock cords like the ones we supply here at Ibex Marina Ropes. Consequently, they are used in some of the most demanding outdoor applications – from securing breathing apparatus in fire and rescue operations, to tethering equipment aboard offshore rigs and submarines. From aerospace cargo management or field-ready military kits, the reliability of shock cord systems is a critical factor under any kind of tension, strain and exposure.

If your intended application for your own shock cords involves using them in outdoor environments, especially for extended lengths of time, then you may well find it helpful to ensure that your team is up to speed on the five most essential tips to help ensure they perform as intended.

Store shock cords correctly between uses

It may seem obvious, but it is still worth saying! Shock cords used in operational environments – such as aerospace hangars or attached to military vehicles – need to be stored with care when not in use. Prolonged exposure to direct sunlight can degrade the outer sheath, particularly when made from UV-sensitive materials like natural rubber. Similarly, cords left damp or coiled in poorly ventilated containers can eventually start to be affected by mould, mildew, or a loss of elasticity.

For best results, cords should ideally be hung or loosely coiled in a dry, shaded area with ambient airflow. Avoid compressing them under heavy objects, as this can deform the cord’s internal structure and weaken the recoil strength over time. Industrial or defence settings may have designated cord storage lockers with ventilation and UV protection, which need to be used wherever possible to protect their material integrity.

Regularly inspect your cords for signs of fatigue or wear

When it comes to assets as safety-critical as shock cords, visual inspections alone are not sufficient – sometimes certain damage is not always evident at a glance, and can even lead to unexpected failure under load.

If your team includes technicians and operators in the aerospace, automotive and rescue sectors, then these teams in particular need to incorporate inspection into their regular maintenance routines. They will need to look for a variety of telltale signs, such as any fraying of the outer braid, stiffness in what should be a flexible core, discolouration from chemical exposure, or small tears that may catch during use.

In offshore applications in particular, salt build-up can also sometimes compromise elasticity. Regular handling and stretching of cords by hand can help detect stiffness or flat spots that indicate internal damage. If cords are used in critical safety roles – such as securing oxygen lines or restraining loose components in environments subject to vibration – they need to be replaced immediately at the first sign of compromise.

Match the cord specifications to outdoor demands

It is crucial to ensure the shock cord used meets the exact performance requirements for its application. For instance, cords used to secure tarpaulin on flatbed transport in high winds will need greater tensile strength than those used inside an aircraft cabin. In the subsea sector, cords often need to be able to avoid degradation and continue to function reliably under extreme pressure.

That means the correct diameter, core composition (e.g. latex or synthetic rubber), and jacket material (such as polyester or Dyneema®) all need to be matched to the expected temperature range, exposure to moisture or chemicals, and the type of load being stabilised. Using an under-rated cord in a critical assembly can result in failure that compromises both safety and performance. Where applicable, cords should meet the relevant BS or ISO standards, and be supplied with traceable technical data sheets to ensure compliance with aerospace, military or OEM specifications.

Anchor your shock cords to stable and appropriate fixtures

Even the most advanced shock cords will only perform reliably when they are anchored correctly. Inconsistent tension or poor fixture points can result in sudden slippage, wear at the connection point, or complete detachment. In automotive trim systems, this may mean securing to reinforced anchor points built into the seating frame.

By the same token, you team should avoid tying cords to sharp edges, narrow posts or untested brackets, as this can cut into the sheath or overstress a single section of the cord. Instead, we would strongly recommend the use of purpose-designed hooks, toggles or load-rated carabiners. You may also need to give consideration to the movement profile of the application – whether it involves vibration, suspension, or cyclic loading – to prevent premature loosening or wear of anchor points.

Avoid prolonged tension under load

While shock cords are engineered to stretch, they are not designed to remain under constant load for extended periods in outdoor environments. Permanent tension, especially under sun or frost, can cause material fatigue and a reduction in recoil force. This is particularly relevant in defence equipment mounted on vehicles, where shock cords may remain in a stretched position for transit.

As well as securing cargo during movement, it is also important to release tension in tied-down cords once the vehicle is stationary. Otherwise, the cord’s cover is continually strained when left fully extended, which can shorten the operational life significantly. This issue can be particularly pronounced in temperature extremes, where rubber cores may become brittle or overly soft. It is vital to make time to enable the cord to return to its relaxed state during downtime, as this will go a long way to preserving its safety characteristics. Where possible, use adjustable fittings that enable the easing of tension without the need for complete disassembly.

These are the essentials covered! If you need any detailed information or specific answers to certain questions regarding the outdoor use of shock cord, feel free to get in touch with our team here at Ibex Marina Ropes. You can reach us through our contact page, or give us a call on 01706 360 363. Our expert team is always happy to help!