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Sun protection factor for cell phones

Bayer MaterialScience AG : 13 October, 2004  (Company News)
Sun, sea and sand. A beach beauty is happily sunning herself safe in the knowledge that her sun cream or even total sun block will protect her skin, but what about her cell phone gently frying away on the towel beside her?
The possible effects of UV radiation range from yellowing through to changes in the material that can adversely affect the mechanical properties. Consequently there's a growing trend toward UV-resistant plastics even for applications that are not constantly exposed to direct sunlight. Now Bayer MaterialScience AG has developed Makrofol® TP 244, a polycarbonate film that is made resistant to UV radiation by an external protective layer.

Hans Braun, an expert in films at Bayer MaterialScience, explains: “The requirements for color fastness in many areas are extremely high and customers are therefore increasingly demanding UV-resistant surfaces for cell phone housings, labels, front panels, applications in car interiors and even illuminated advertising boards. As a UV protective polycarbonate film, the newly developed Makrofol® TP 244 meets their requirements.”

The Bayer MaterialScience experts relied on their expertise gathered over many years in the field of polycarbonate sheets to develop the product. Makrolon® sheets are specially designed for exterior applications and can withstand weathering for decades. The tried-and-tested UV protective layer used on the sheets is also applied to Makrofol® TP 244 film by coextrusion.

Thanks to this structure, the film far exceeds the requirements of tests such as SAE-J 1885, which simulates the effects of weathering using artificial radiation. Additional tests for exterior applications have already begun. As the protective layer is also based on polycarbonate, the typical characteristics of this material, such as high transparency, heat resistance and dimensional stability, are retained. What's more, Makrofol® TP 244 is easy to process, impact-resistant and can easily be punched.

Hans Braun continues: “Harnessing the tried-and-tested technology from Makrolon® sheets brings UV protection to where it's most effective, namely the outer layer. Makrofol® TP 244 enables us to offer a solution for all applications where both lightfastness and the typical properties of polycarbonate films are important.”

Makrofol® TP 244 is available in all standard thicknesses over 175 microns.
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