Lexan Exell D, Marlon fsx longlife and Arla Makrolife are suitable for out door use. These grades are slightly more expensive than the standard but have warranties (normally 10 years) against discolouration.
Although Polycarbonate is very strong in terms of impact, it will scratch easily! Grades of polycarbonate with a hard coat surface are available (Lexan Margard MR-5E , Marlon fs Hard, and Arla Saphir) which improves resistance to abrasion. It should be noted that no hard coat plastic is designed to with stand deliberate attacks with sharp objects. These standard "hard coat" grades are only suitable for flat glazing applications.
Margard FMR-5E is also available which is scratch resistant and can be cold curved. The scratch resistant grades normally carry a 10 year limited warranty against breaking due to loss of impact strength through weathering and a 5 year limited warranty against excessive yellowing and loss of light transmission due to weathering.
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