How to prepare shock cords for long-term storage in humid conditions

Shock cords like the ones we supply here at Ibex Marina Ropes are designed to provide safety, durability and performance as standard, but the way in which they are stored makes a big difference to how well they are able to maintain these qualities. So, if you are preparing to store shock cords for an extended period in a humid environment, it is important to take deliberate steps that safeguard their strength and flexibility. Moisture can shorten the lifespan of cords if it is not controlled, and improper preparation can lead to mildew, weakened fibres, or loss of elasticity. With that in mind, you will want to focus on careful inspection, cleaning, packaging, and monitoring of storage areas, so that you can be sure you are keeping your cords in good condition and avoiding unnecessary waste, replacement costs – or safety risks.

Here is what you need to know!

Inspect your shock cords carefully before long-term storage

It is always best to begin by giving each shock cord a thorough inspection. So, look closely at the outer sheath to see if there are any frays, abrasions, or cuts that may have been caused during use. All of our shock cords are tested extensively against wear and tear, but it is still good practice for you to check them before storing them. Run your fingers along the length of each cord to feel for rough patches or flattened areas that might indicate internal damage. If you see or feel any weak points, set those cords aside rather than placing them in storage.

It is also a good idea to check the hooks, clips, or fasteners attached to the cords. These metal or plastic fittings can corrode or crack over time when exposed to damp conditions. If a cord is brought back into service with compromised fitting, it can potentially fail under strain – which can result in anything from property damage to actual bodily harm. So, if you find any components that are worn or rusted, make sure to replace them before storage or retire the cord completely.

Clean and dry your cords to prevent mould and damage

You will need to clean your cords before you place them into any kind of storage environment. Dirt, salt, and oils from regular use can accelerate deterioration, especially when trapped in a humid atmosphere. It is best to use mild soap and lukewarm water to gently wipe each cord. By the same token, try and avoid using harsh chemicals, as these can break down the elastic fibres and cause premature loss of elasticity. After you have cleaned them, rinse the cords thoroughly with clean water to remove any soap residue that might otherwise cling to the sheath.

Once cleaned, you will then need to allow your cords to dry completely. Humidity already presents a challenge for long-term storage, and adding residual moisture will only increase the risk of mould growth or fibre damage. So, lay the cords out in a well-ventilated area, away from direct sunlight, and give them ample time to air dry. It may take several hours, but it is one of the most important steps you can take to maintain their durability.

Packaging methods that protect cords from humidity

The way you package your cords has a direct impact on how well they withstand long-term storage. You can use resealable plastic bags with silica gel packets inside to absorb excess moisture. This creates a protective barrier around the cords and reduces the risk of mould or mildew developing. Make sure that you do not overcrowd the bags – if the cords are pressed too tightly together, it can lead to kinks and distortions in their shape. Each cord should be loosely coiled, allowing it to retain its flexibility and making it easier for you to retrieve later.

Another effective method is to use airtight plastic storage containers. If you do end up choosing this option, make sure to add moisture-absorbing materials such as silica gel or activated charcoal to regulate the humidity level. Label each container with the date of storage and cord type so you can easily manage your inventory over time.

Monitor your storage areas for signs of excess moisture

Even after you have inspected, cleaned, and packaged your cords, you will need to keep a close eye on the storage environment. Humid conditions can change quickly, and ongoing monitoring can help you keep the storage environment stable and avoid problems. Place a hygrometer in the storage space to measure humidity levels regularly. Aim to keep the relative humidity below 60%, as this significantly reduces the risk of mould and fungal growth. If you notice that humidity levels are consistently higher, you might want to consider using a dehumidifier to stabilise the conditions.

It is also a good idea to periodically check the cords themselves. Open a container or bag every few weeks to make sure that the cords are still in good condition. Look for any signs of condensation inside the packaging, as this indicates that moisture is penetrating the storage barrier. If you find dampness, do not hesitate to remove the cords immediately, dry them again, and replace the moisture-absorbing materials. This can help to catch potential problems early and extend the working life of every cord you store.

These are all the essential points covered – and if you ever need any help or more specific advice on the storage or usage of your shock cords, that is exactly where we can help here at Ibex Marina Ropes. We have unrivalled experience with shock cords, and serve a wide range of sectors across the UK and beyond, including aerospace, military and defence, subsea and offshore, and sport and leisure – just to name a few.