COMPOUNDS FOR EVs | AUTOMOTIVE
for use as rear sensor housings or behind the radar sensor PCB, they provide water, oil and salt resistance as well as shielding sensitive internal electronics from electromagnetic interference. The different Ultradur RX series products are designed for absorption and reduction of interference radiation in the 76-81 GHz range.
resins combines greater design freedom with expanded processing flexibility so customers can create stunning yet easily manufactured lighting components.”
Structural options Aiming at structural applications, BASF has expanded its polyphthalamide (PPA) Ultramid Advanced portfolio with a line of carbon-fibre reinforced grades with 20, 30 and 40% fibre content. The materials are pitched at structural applications in the body, chassis and powertrain sectors where they can replace aluminium and magnesium without loss of stiffness and strength. The grades are also electrically conductive. According to the company, the new grades offer high dimensional stability due to their low water uptake, along with good chemical and hydrolysis resistance, high strength and modulus. Mechanical performance can be tailored by carbon fibre content and additive technology selection. Ultra- mid Advanced N3HC8 with 40% carbon fibre reinforcement, for example, shows better strength and modulus at 80°C (conditioned) than magne- sium or aluminium while providing a typical part weight reduction of 25-30%. BASF has also developed a new heat stabilised
Ultramid grade that offers heat resistance of up to 190°C in demanding environments. The 30% glass fibre reinforced Ultramid B3PG6 BK23238 PA6 meets requirements for use in hybrid and electric power- trains and is commercially available. In addition to its long term high temperature stability, it prevents galvanic corrosion of electrical components. Ultradur RX is another new addition to the BASF
portfolio and is intended to provide greater clarity in radar sensors for automated driving. The company says the modified polybutylene tereph- thalate (PBT) compounds absorb and reduce signal noise, which improves road traffic safety. Intended
www.compoundingworld.com BASF’s Ultradur RX is claimed
to provide greater clarity in radar sensors for automated driving
April 2021 | COMPOUNDING WORLD 73
Sensor developments Daicel Corporation business Polyplastics has developed a number of new grades for use in sensors for Advanced Driver-Assistance Systems (ADAS). It says its Duranex PBT and Durafide PPS materials are being targeted at sensors in radar and camera bracket systems. Radar housings require materials with low dielectric constant, stable radio wave transmissibil- ity, and low water absorption, the company says. Manufacturers have to date tended to opt for syndiotactic polystyrene (SPS) and polyetherimide (PEI) for dielectric properties and PPS for low water absorption and chemical resistance. However, to meet increasingly tight cost challenges, some are considering PBT in their designs. Polyplastics says it is working on development of new PBT grades with enhanced low-dielectric properties and low water absorption. The company says its electrically conductive
Duracon POM CH-10 and EB-10 POM and Duranex PBT 7300E compounds are being actively consid- ered for radar brackets, where electromagnetic shielding is required, while new PBT grades with stronger electromagnetic shielding properties are under development. For car-mounted sensing camera brackets, low-warpage and high-rigidity materials such as its Duranex PBT 733LD and 7407 are said to be preferred. Polyplastics has also developed a matte technol-
ogy that uses a laser treatment to reduce noise from scattered light. The laser treatment results in good gloss and blackness levels and the company
Left: BASF’s Ultramid Advanced carbon-fibre reinforced PPA can be used for structural automotive applications
IMAGE: BASF
IMAGE: BOREALIS
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