Fiat has adopted Sabic's clear Lexan GLX resin (polycarbonate) and black Cycoloy resin (polycarbonate and ABS) for the rear windows of 500L. Compared to glass, these materials reduce weight by about 35%, improve aerodynamic efficiency and achieve the desired styling. The rear windows of Fiat 500L are produced with a double-shot injection compression moulding process allowing for the seamless integration of an aerodynamic spoiler.
The selected materials enabled Fiat to overcome the key challenges involved in designing a rear window adjacent to an aerodynamic spoiler, including the gap between the two parts, different colour tones and assembly issues. The crystal clear Lexan GLX resin provides optimal visibility, while the black Cycoloy XCM resin serves as a fade-out band, ensures uniform colour across the window and spoiler, provides structural functions and contributes to superior dimensional stability.