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Phototendering is the process by which organic fibres and textiles lose strength and flexibility due to exposure to sunlight. The ultraviolet component of the sun's spectrum affects fibres, causing chain degradation and, hence, loss of strength. Colour fade is a common problem in phototendering.
Many synthetic polymers are also degraded by Ultraviolet, and polypropylene is especially susceptible. As a result, UV stabilisers are added to many thermoplastics. Ultraviolet absorbers such as carbon black are also effective in protecting products against UV degradation.
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