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05-22-2015

Improved Strength and Impact Resistance

Local Reinforcement of Thermoplastic Molding Compounds

The stiffness of Tepex performance composite at high temperatures ensures that the cover does not deform or fail in the hot environment of the rear muffler (figure: Lanxess)

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.

Company profile

Bond-Laminates GmbH

Am Patbergschen Dorn 9
DE 59929 Brilon
Tel.: 02961 96628-0
Fax: 02961 96628-500

LANXESS Deutschland GmbH

Gebäude G17
DE 51369 Leverkusen

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