A highly thermally insulating as well as cost-effective window system has been introduced using specially developed Ultradur® High Speed (PBT) by BASF. This glass fiber-reinforced thermoplastic replaces the steel that is normally used for window frame profiles, thus providing much better heat-insulating features without changing the mechanical properties of the windows. The new profiles do not only save time-consuming and costly work steps for window manufacturers but also weigh 60% less than their metal counterparts. The new window profiles can be processed on conventional production lines. Thermal insulation improved by 20% - thanks to plastic. Window manufacturers can process the new profiles on their current equipment without the need to make additional investments.
Two flat strips made of Ultradur are extruded into the new window profile, replacing the metal profile that is usually heavy and difficult to install. The U-value (formerly "k-value": heat transfer coefficient, thus a parameter for thermal-insulation capacity) of the window frame profiles using the flat Ultradur strips is improved by about 20%, namely, to 1.1 W/(m² . K), in comparison to the standard versions that contain a steel profile.