Improved Strength and Impact Resistance
Local Reinforcement of Thermoplastic Molding Compounds
Engineers are increasingly using Tepex performance composites from Bond-Laminates GmbH, Brilon, Germany, a subsidiary of Lanxess AG, Cologne, Germany, to greatly improve the mechanical strength of components made of fiber-reinforced thermoplastic compression molding compounds. The latest example of this is a cover on the rear muffler of the BMW i8. It is fabricated in a direct long fiber thermoplastic (DLFT) process from a polypropylene (PP) compression molding compound, which has been reinforced with long glass fiber rovings. An insert made of Tepex dynalite 104-RG601 serves as the surface layer. Its stiffness at high temperatures ensures that the cover does not deform or fail in the hot environment of the rear muffler. In addition, the composite improves the strength and impact resistance of the component in freezing temperatures.
The Tepex insert is 0.5 mm thick and consists of a PP matrix incorporating 47 % by volume continuous glass fiber rovings as a single-ply fabric. Thanks to the insert, the stiffness of the cover increases by a factor of four at room temperature and a factor of six at the operating temperature of the muffler. Impact resistance benefits as well. In penetration tests to DIN EN ISO 6603-2, the Tepex dynalite formulation used proved to be eight to nine times more impact resistant at room temperature than DLFT compression molding compound based on PP. At temperatures of -30 °C, the impact resistance is even ten times as high: DLFT based on PP will splinter under conditions in a crash, whereas Tepex will not, according to the company.
Translated from Kunststoffe 5/2015, p. 13.
LANXESS Deutschland GmbH
Patents encourage innovation: Stay on the ball with the latest innovations in the plastics industry in our patents section.
Would you like to subscribe to our Newsletters on plastics technology and profit from the latest information?
You know the trade name but want to know the material manufacturer, type of polymer and delivery form? Search here!