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Highly reinforced polyamides for ultra-thin wall thicknesses technology

News International-French

16 Oct 2014

Lanxess expands range of high-modulus thermoplastics for injection molding with two polyamide 6 grades with good surface qualities finish.

Polyamides and polybutylene terephthalates reinforced with a glass fiber content of 50 percent and more are ideal for applications in lightweight construction thanks to their strength and stiffness. They frequently are a lightweight and economical alternative to sheet molding compounds (SMC) and other reinforced thermosets, as well as to metals like steel, aluminum and die cast zinc. Lanxess therefore has been regularly adding new variations to its already wide range of injection molding materials in this segment. The latest examples are two new polyamide 6 grades.

Tailored for “ultra-thin-wall technology”
Durethan BKV 60 XF is an advancement of Durethan DP BKV 60 H2.0 EF, which already is established in mass production for articles such as lightweight front ends, spare wheel recesses and large transmission oil pans. The new product is also reinforced with 60 percent glass fibers, but with a comparably high-quality set of mechanical properties, it displays better melt flow by 30 percent. The new polyamide results in smooth surfaces with virtually no protruding glass fibers. This excellent surface quality is based on an optimized crystallization process and higher injection rates, which are possible thanks to the high flowability of the melt. Another advantage of this engineering material – which also permits laser marking – is its improved resistance to thermal aging. For example, the tensile stress at break of test samples was still above 200 MPa after over 3,000 hours of hot-air aging at 180 °C.

Perfectly suited for tablet PC back shells
The second material innovation is a polyamide 6 that is to be marketed under the name Durethan BG 60 X XF. It is reinforced with 60 percent of a special mixture of glass fibers and glass microspheres. Its stiffness and strength are similarly high to those of Durethan DP BKV 60 H2.0 EF. Initial manufacturing trials with mass production molds already have confirmed that the material can deliver these advantages.

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