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https://en.wikipedia.org/wiki/Ultraviolet
Other Effects of UV Radiation
Many
polymers used in consumer products are degraded by UV light, and need addition of
UV stabilizers to inhibit attack. Products include thermoplastics, such as
polypropylene and
polyethylene as well as speciality fibres like
aramids. UV absorption leads to chain degradation and loss of strength. In addition, many
pigments and
dyes absorb UV and change colour, so paintings and textiles may need extra protection both from sunlight and fluorescent lamps.
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https://en.wikipedia.org/wiki/Aramid
Aramid fibers are a class of heat-resistant and strong
synthetic fibers. They are used in aerospace and military applications, for ballistic rated
body armor fabric, and as an
asbestos substitute. The name is a shortened form of "
aromatic polyamide". They are fibers in which the chain molecules are highly oriented along the fiber axis, so the strength of the
chemical bond can be exploited.
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