When it comes to choosing the right strapping for your application, colour is often selected based on operational requirements, branding, or product differentiation. However, one important factor that should not be overlooked—especially for outdoor storage or transportation—is how different colours of strapping perform under prolonged exposure to ultraviolet (UV) rays.
At Gordian Strapping, we’re committed to helping our customers make informed choices. This article outlines the technical considerations of UV exposure on strapping colours—without discouraging the use of non-standard options, which remain entirely valid in many use cases.
The science behind UV degradation
UV rays, a component of natural sunlight, can cause photodegradation—a process where the polymer chains in plastic materials begin to break down. This can lead to a gradual reduction in the tensile strength, flexibility, and appearance of the strap over time.
However, modern strapping materials, particularly polypropylene (PP) and polyester (PET), are typically stabilised with UV inhibitors and additives to significantly delay this degradation process. The degree of protection can vary depending on the formulation, exposure time, strap thickness and—importantly—strap colour.
How strap colour affects UV resistance
Different colours absorb and reflect UV rays to varying degrees:
Black strap
Black is the most UV-resistant colour due to the inclusion of carbon black pigment. Carbon black acts as a highly effective UV stabiliser, providing superior resistance to degradation. As a result, black strapping is generally recommended for long-term outdoor storage or transport.
Natural/Clear strap
This type lacks pigments that could block or absorb UV radiation, making it more susceptible to photodegradation. Natural strap is best suited to indoor applications or environments where UV exposure is minimal.
Coloured straps (Blue, Green, Red, Yellow, etc.)
Non-standard colours are absolutely viable and often used for product identification, branding, or safety coding. However, their UV resistance depends on the specific pigments used. While some colours may offer moderate UV protection, others may fade more quickly or become brittle over extended exposure.
To account for this, Gordian can offer UV-stabilised formulations across a wide range of colours, helping to prolong performance in outdoor conditions. If your operation relies on coloured strap and outdoor exposure is a factor, our team can advise on enhanced UV options tailored to your requirements.
Practical considerations for customers
Indoor vs. Outdoor Use: If your strapped loads are stored indoors or in transit for short periods, UV exposure is unlikely to be a concern for any colour.
Exposure Duration: Consider how long your strapped goods are exposed to sunlight. Weeks or months in direct sun will have a greater impact than a few days.
Custom Formulations: Gordian can supply custom-coloured straps with UV protection where required—so you don’t have to compromise between aesthetics and durability.
Shelf Life & Stock Rotation: Even UV-resistant straps benefit from proper stock rotation and indoor storage to maintain peak performance.
In summary
While black strapping remains the best performer in UV-heavy environments, coloured straps continue to be a valuable and effective option—especially when used appropriately. At Gordian Strapping, we support a full spectrum of strap colours and can help ensure the right material specification is used for your application, with UV resistance included where necessary.
If you’d like guidance on choosing the right strap colour and formulation for your operational needs, our technical team is happy to help.
Contact us at sales@gordianstrapping.com, or visit gordianstrapping.co.uk to learn more.
