ELECTRICAL AND ELECTRONIC | MATERIALS
New Ultradur B4440 PBT from BASF has excellent colour stability at high temperatures
and EMI/RF shielding properties to avoid any safety issue. “With its vast knowledge in electrically conductive plastics, Eurotec provides electrically conductive and structural materials that are especially suited to sensor components,” it says. Ruediger Bluhm, Group Leader Technical Development EP Industrial, says BASF has been putting a strong emphasis on development of flame retardant materials for E&E applications, most of them using halogen-free systems. The company is getting an increasing number of requests from the transportation sector, as it moves in the direction of e-mobility, for such products. One new development is an HFFR unreinforced
Ultradur PBT, B4440. This is suitable for a wide range of products, including connectors, as well as extruded products such as filaments and optical cables. CTI value is 600V. RTI values are also very good, indicating high resistance to heat ageing. RTIElec
and RTIStr are both 155°C.
Ultradur B4440 has an elongation at break of over 20%, which BASF calls a “quantum leap” in performance. Tsunenobu Sato, in the Sales Planning Depart-
ment at Polyplastics, also points to trends in automotive that are influencing plastics develop- ment. He says reliability requirements of compo- nents in electrical systems continue to increase, including resistance to harsh in-vehicle environ- ments for a long period of time. “If the parts are damaged or their insulation and airtightness cannot be maintained, there is a risk that the system will break down or fail, causing an accident,” he says. Polyplastics is developing and commercialising various PBT grades for diverse electrical compo- nents and situations. For example, for automotive connectors that meet USCAR requirements, unreinforced Duranex 201HR and glass fibre-rein- forced, tracking-resistant Duranex CG7030 are employed; both are hydrolysis resistant (HR). Meanwhile, for ADAS sensors, glass fibre-rein- forced, hydrolysis resistant Duranex 330HR, and
www.injectionworld.com
reinforced, low warpage, Duranex 733LD or 7407 can be selected to achieve both radio wave characteristics and durability. For xEV applications (xEV is a term used in Japan to cover various types of fully electric and hybrid vehicles), in order to improve the reliability of over-moulded products, another set of PBTs are used, and there are yet more for applications that require flame resistance. Duranex 201HR was launched in the last few
weeks. Polyplastics says it delivers “significant” improvements in hydrolysis resistance and thermal shock resistance for a range of applications. The supplier says it is particularly well-suited for automotive connectors located in harsh operating environments. Duranex 201HR complements Polyplastics’ Duranex LT Series which also has high thermal shock resistance. Lanxess says Pocan XHR (Xtreme Hydrolysis-
Resistant) product range, launched at K2019, has outstanding resistance to hydrolytic degradation in very hot and humid conditions. In internal testing with standardised test specimens based on the Society of Automotive Engineers’ SAE/USCAR2 Rev. 6 long-term hydrolysis tests, the compounds reached Class 4 or Class 5 – the top two ratings. Rapid and extreme changes in temperature
often cause stress cracks in components with over-moulded metal areas because of the differ-
Source: BASF
Below: Polyplastics is aiming at high-voltage applications with various PBTs
October 2020 | INJECTION WORLD 53
IMAGE: POLYPLASTICS
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62
