GE Plastics has introduced a new grade of Lexan polycarbonate (PC) sheet that is specifically designed to boost the visibility and attractiveness of illuminated signage.

Lexan SG305-OB sheet, unlike conventional sheet products, offers both uniform light diffusion to eliminate light emitting diode (LED) “pinholes” and a view of light sources, and superior light transmission for exceptional optical brightness at lower energy costs. In fact, the 2 mm and 5 mm thickness of Lexan SG305-OB sheet boosts light transmission to more than 50 per cent, vs competitive materials like polymethyl methacrylate (PMMA) that allow only about 25 per cent. The new white sheet grade, which has a matte finish on its outward-facing surface to reduce reflections, also provides excellent UV protection as well as the renowned impact resistance of tough, virtually unbreakable Lexan resin.
The outstanding aesthetics, performance, and formability of GE’s new Lexan SG305-OB sheet are spurring innovative new lighting solutions, such as the ADDscreen illuminated roll-down security shutters offered by Euroll and ADDscreen, both of The Netherlands. These unique shutters, which protect stores, ticket windows, and other spaces after hours, feature computer-generated advertising that is beamed onto the reverse side. The GE material’s superior optical brightness and diffusion capabilities present the projected graphics with optimal visibility, while its impact resistance enhances security. The product’s easy fabrication enables complex designs.
Joanna Wolska, global clear sheet product manager, GE Plastics, said, “Until now, sign manufacturers have been forced to choose between optimal diffusion and optimal brightness. Now, with our Lexan SG305-OB sheet, they get both – plus great performance and fabrication ease. This new material opens up many new design opportunities for illuminated signage. For example, the SeaCloud Hotel in Busan city, South Korea, is using Lexan SG305-OB sheet for its main exterior sign and others are following suite.”
The SeaCloud hotel sign utilises a colour-changing system, which occurs when Lexan SG305-OB sheet is installed with a grey-colored film. As a result, the material shows as grey during the day and white at night when displayed with LED lamps. This gray colour film has many small holes which allow lamp light to pass through when it is dark.
The material is commercially available worldwide.