MATERIALS | ELECTRICAL AND ELECTRONIC
toward automation in production at our customers’ plants also means that simple and stable manufac- turing is essential. Ultradur B 4440 and Ultramid B3U42G6 make this possible.” Independent compounder Akro-Plastic says it
is providing a family of products meeting the needs of consumers and industries in the E&E field. It has established a portfolio with materials ranging from unreinforced PA 6 FR to highly reinforced PARA (Polyarylamide) Akroloy GF 35 FR. Small housings for electro-magnetic interference filters can be made with a film hinge that is only 0.4 mm thin but still achieves UL 94 V-0, the supplier says. Akromid C3 GF 25 1 FR, meanwhile, can be used
to produce all the different connectors required to equip two-wheelers with electric drives. “This material is strong but still ductile enough to with- stand the dynamic loads during operation,” says a representative. This material property is essential for snap-fit locks securing the connection in the case of vibration and sudden impact both on and off road. Industrial electric control cabinets can contain massive bus bars, which have to be very firmly mounted inside the cabinet, since they can be loaded with high forces by electromagnetic effects in the event of an electric short circuit. Akro-Plastic says Akromid B3 GF 30 FR is already a successful problem solver in this kind of application, while newer developments will use Akromid B28 GF 35 FR. The latest addition to the portfolio is a flame- retardant PPA, for use in applications where a safe operation of main switches and circuit breakers must be assured even at high surrounding temperatures. Celanese says it is now offering key solutions to
make 5G infrastructure and devices better and more powerful. Many of these solutions are based on liquid crystal plastics, LCPs, with low dielectric constant (Dk) and low dissipation factor (Df), critical for 5G applications.
The 5G technology platform will support services requiring high-speed connectiv- ity with massive capacity and reliability. 5G uses two frequen-
Akromid C3 GF 25 1 FR from Akro-Plastic is suitable for different connectors on two-wheelers with electric drives. This material is said to be strong but still ductile enough to withstand the dynamic loads during
operation 56 INJECTION WORLD | October 2020
cy bands, sub-6GHz and mmWave. Both of these, but especially mmWave, are putting increased demands on components used not only in devices, but the 5G infrastructure as well. “Without the right components, we will suffer from slower-than-ex- pected data transfer, unstable connections, and signal loss,” says Celanese. “So it is clear that there are many challenges to overcome in making 5G infrastructure and 5G-capable devices as efficient and effective as possible.”
LCPs for 5G networks Celanese points to grades of its Vectra and Zenite LCP resins offering lower Dk/Df than rival LCPs and other aromatic thermoplastics such as PPS. These products have been widely used in high-speed communication applications such as connectors for many years, the company says, but 5G demands even better material solutions. Zenite LCP 251 is one example. It has a very low and consistent Dk (~3.0 at 10GHz) and Df (0.003 at 10 GHz) across a wide range of temperatures and electronic frequencies (values are determined by the IEC 61189-2-721 method). The compound has low moisture absorption (around 0.02% in high humidity, determined via ISO 62) and high heat resistance (Heat Deflection Temperature, HDT, under 1.8MPa load, is 290°C (ISO 75-1)). Celanese says that in high-frequency applica-
tions, the low moisture absorption requirement of thermoplastics is becoming increasingly important; this is because moisture uptake by a polymer can result in a substantial increase of Dk value, which can vary widely depending on humidity. This may lead to unexpected noise or malfunction in high-frequency devices. “This is one of the reasons why high temperature-resistant polyamide-based products can be replaced with this new LCP product,” claims the company. Another benefit of this new grade is its high
flow, even in parts with very thin walls (down to around 0.2mm); this is due to its particular shear- thinning effect, which is higher than in other LCPs. This makes it possible, for instance, to create slim, fine-pitch connectors with thin walls. Apart from low-Dk Zenite LCPs, Celanese says it can also tailor the Dk/Df ratio in LCPs, making it possible to have a material with a Dk in the range of 4-25 at 2 GHz while maintaining the Df value as low as possible. The Dk value is closely related to the antenna function of a component. The Df value is directly related to signal loss: signal loss can be improved by maintaining a Df as low as possible. “The problem is that maintaining a low Df while substantially increasing Dk is difficult without
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IMAGE: AKRO-PLASTIC
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