A UV Stabilizer Additive is an important part of plastic formulations designed for products exposed to sunlight. Ultraviolet radiation can trigger photodegradation, leading to colour changes, cracking, chalking and loss of physical properties. However, selecting a stabiliser is not simply about adding a fixed percentage to every polymer. The resin, product thickness, exposure conditions, processing method, expected service life and other ingredients all influence the right choice.
Different polymers respond differently to UV exposure, so a formulation developed for one resin may not deliver the same results in another. Kandui’s UV stabiliser guidance highlights the importance of considering UV intensity, geographical location, article thickness, exposure time and expected life when determining additive type and dosage. Colourants, flame retardants and antioxidants must also be considered because these components can influence the overall formulation.
For processors, the starting point should therefore be the polymer and its end use rather than the additive alone.
Polyolefins such as PP and PE are widely used in outdoor products, films, raffia, pipes, nets and moulded articles. Kandui’s AddKan range includes PE-based HALS UV masterbatches designed for applications such as PP/HDPE raffia, PP/PE pipes, HDPE/PP products, nets, general-purpose films, mulch films, and PP fibres and filaments. The company also lists grades with different active contents and application focuses.
For outdoor PP and polyethylene products, HALS is particularly relevant. Kandui explains that HALS can provide effective protection at relatively low concentrations and has a regeneration property, helping provide longer-lasting stabilisation. The final grade should still be selected according to the application and required service life rather than assuming one formulation fits all PP or PE products.
PET and other engineering polymers require a different evaluation. Product geometry, processing conditions and exposure conditions can affect formulation requirements. Kandui’s portfolio includes Engineering plastic compounds, making polymer compatibility an important part of formulation planning.
The same principle applies to man-made fibres. PP, polyester and nylon fibres may have different requirements because of their processing and end-use conditions. Kandui lists Masterbatches for man-made fibers and UV stabiliser applications covering PP fibres and filaments, among other uses.
A practical formulation review should consider:
UV stabilisers generally fall into two major categories highlighted by Kandui: ultraviolet absorbers (UVA) and hindered amine light stabilisers (HALS). UV absorbers work by absorbing UV radiation, while HALS are designed to protect polymers from light-related degradation through a stabilisation mechanism that allows regeneration.
A UV Stabilizer Additive should therefore be selected according to the polymer and exposure conditions, rather than treated as a universal ingredient. Kandui’s product information identifies PE-based HALS grades for PP/HDPE raffia, pipes, films, nets and fibres. In some cases, combinations of additives can provide a synergistic effect, which is why formulation decisions should consider the complete system rather than one additive in isolation.
Using a masterbatch allows active ingredients to be incorporated into the polymer in a controlled and well-dispersed form. Kandui states that its Additive Masterbatches are designed with well-dispersed active ingredients to achieve desired properties at optimum dosage levels. This can support consistency during processing while allowing the processor to select a grade suited to the application.
UV protection may also need to work alongside colour and other functional properties. Kandui’s Colour Masterbatches portfolio notes that colour solutions can be combined with functional additives such as UV stabilisers, while its Black Masterbatches range includes grades designed around specific polymer and end-use requirements.
A formulation should therefore be assessed as a complete package: resin, stabiliser, colour, other additives, processing conditions and final application.
The best formulation is not necessarily the one with the highest stabiliser concentration. It is the one that matches the polymer, processing conditions and exposure requirements while providing the required level of protection and consistency. A manufacturer should share details such as polymer type, product dimensions, processing method, outdoor exposure, expected service life and other additives when discussing a formulation.
For processors working across films, pipes, raffia, fibres, sheets, moulded components and other plastic applications, this application-led approach can make UV stabilisation more predictable. Kandui’s range of Additive Masterbatches, UV stabiliser masterbatches, Colour Masterbatches, Black Masterbatches, Masterbatches for man-made fibers and Engineering plastic compounds provides a broad base for evaluating compatible solutions.
Selecting the right UV Stabilizer Additive requires more than comparing active content or price. Polymer compatibility, UV exposure, product thickness, processing method, other formulation ingredients, and required service life all need to be considered together. For manufacturers looking for application-focused masterbatch solutions, Kandui is the best option to opt for, with its range of additive masterbatches and polymer-focused solutions supporting different processing and end-use requirements.
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