MATERIALS | ELECTRICAL AND ELECTRONIC
have high thermal and ignition resistance with good tracking behaviours to avoid any safety failure,” says Eurotec. “In addition, if the plastic materials directly contact with battery, they need to show good resistance against chemicals which comes from battery leakage. Eurotec offers intelligent solutions that meets these strict require- ments in a battery pack.” In electric motor applications, like gears,
Above: DuPont has developed numerous hydrolysis- resistant grades of Crastin PBT for automotive sensors
ductile and so is more suitable for bigger parts needing to withstand high stresses. Over long periods, PBT doesn’t normally retain its dimension- al stability or its elongation properties so well, meaning that the integrity of over-moulded metal conductors may suffer. Electrical properties in PBT are more stable, thanks in part to the fact that PBT does not absorb water. The number of sensors on a car continues to
rise, and they need to work in a wide variety of conditions. DuPont has a range of Crastin grades for these applications. The portfolio includes halogen-free flame retardant (HFFR) PBT grades (FR40 types) as well as one hydrolysis-resistant PBT, Crastin HR5330. Crastin FRHR5325 is flame retardant and hydrolysis resistant. With Industry 4.0, and the high level of automa-
Right: Eurotec offers high hydrolysis resistant grades which comply with OEM specifications including Renault (AS 27), VW (TL 52682) and PSA (B71-6000)
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tion that comes with it, QR codes are becoming a key enabler for identification purposes. “There is a need to look at contrasts obtainable with laser marking,” Parisi says. Laser transparency is also important in some applications, so that it is pos- sible to use laser welding, which is becoming more popular in electronic switches for example, where it is not possible to use vibration welding often used for electro-mechanical components. DuPont has been able to raise transparency levels in some of its grades. For example, in Crastin HR5430, transparency has been raised from 20% to 25% at 1mm thickness. The future of the automotive industry is being shaped by E-mobility, says Eurotec, the producer of PA6, PA66, PBT and many more engineering “plastics for E-mobility with the combination of its deep material knowledge and experience in automotive and E&E industries”. The company’s approach to E-mobility has five target areas; battery pack, electric motor, high voltage connec- tors, thermal management systems and drive assistance sensors. “Plastic materials could be exposed to high currents or sparks in the battery so they need to
INJECTION WORLD | October 2020
bearings, covers, coils, brushes, it is important to choose the right material for due to the high temperature requirement, dimensional stability and friction resistance. For high voltage connectors, it is important that
materials should have a high dielectric strength, creep and tracking resistance for high voltage applications. These materials should also have halogen-free or red phosphorous-free options to meet high CTI demand for these applications, which Eurotec says it offers through the use of highly resistant own masterbatch solutions for orange-coloured compounds. The company says: “Thermally conductive plastic materials increase the performance of electric vehicles due to their lightness in weight compared to metals. In E-mobility applications, components become smaller, require more power and need to have an aesthetic aspect but a new challenge arises at this point, high thermal load. Thus, it is important to dissipate heat to enhance life time and reliable power for the battery.” Eurotec offers high hydrolysis resistant grades which comply with OEM specifications such as Renault (AS 27), VW (TL 52682) and PSA (B71- 6000). It additionally offers thermally conductive grades for thermal management requirement for electric vehicles. In the area of drive assistance sensors, the company says it is important that sensor housing materials should have a good mechanical stiffness, creep and fatigue resistance, dimensional stability
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IMAGE: DUPONT
IMAGE: EUROTEC
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