electrical & electronics | Technology


humidity. Radeck sees potential for the new compounds in conventional electrical appliances and also in photovoltaics. A further strength of the new PBT grades is their


resistance to thermal aging at higher temperatures. Their relative thermal indices (RTI) achieve values to UL 746B of up to 150°C (0.4 mm). “After UV and thermal aging, the greater long-term heat resistance in air also leads to greater colour stability compared to PBTs with halogen-based flame retardance packages,” says Radeck: “This makes the materials ideal for manufac- turing housings for LEDs, for instance.” The new PBT materials are designed to ensure they


have a wide processing window and process in a stable manner. Their shrinkage behaviour is so similar to PBT compounds with halogen-based flame retardants that they can be processed in the same moulds. Their density is up to 8% lower. BASF is expanding its range of engineering plastics


as the trend toward miniaturization persists for electronic components in cars. It says that with a new Ultradur PBT grade, B4340ZG2 HSP (High SPeed), connectors will be more robust against damage such as breaks and cracks. In applications such as wire harnesses, robust and


Below: BASF Ultradur


B4340ZG2 HSP for thin-walled plug-in connectors combines high flowability with very good impact strength


unbreakable plug-in connectors are needed, as replacing broken, individual end sections involves a great deal of work and expenditure. The new PBT grade has optimized product properties specifically for this application, combining the high flowability and very good impact strength necessary for thin-walled plug-in connectors. Ultradur B4340ZG2 HSP also boasts very good


electrical properties. The CTI is 600 V, permitting extremely short distances between the conductor tracks in plug-in connectors.


Lanxess says halogen-free flame-retardant PBT compounds have greater colour stability compared to PBTs with halogen-based retardants


Automotive connectors At last November’s Electronica trade fair in Munich, DSM unveiled ForTii Ace JTX8, which was developed specifically for automotive electronic connectors. This is one of the very few polyamide grades in the world so far to have secured, in all product designs, the JEDEC MSL 1 (moisture sensitivity level 1) rating. This means that parts will not blister during high temperature soldering, even after being stored for long periods (see Injection World December 2016 for more on this). Rui Zhang, Marketing Manager, Connected Car, at DSM says that with other solutions in the market, a connector designer always needs to make a compro- mise to carefully design around the brittleness of the material, the weak weld lines, or the low peak tempera- ture resistance. ForTii Ace JTX8 is also said to be an ideal match for


automotive electronics applications in environments of up to 200°C. It contains copper iodide salt-based stabilizer, which can create corrosion issues on metal contacts. DSM says the new grade can match the thermal stability of a standard copper iodide stabilized PPA. Several other suppliers have introduced “electrically


neutral” grades to combat this corrosion problem. DuPont, for example, has expanded its Electrically Friendly (EF) product line in its Zytel portfolio with the introduction of PA66 15%, 25% and 30% glass reinforced and with PA6 30% glass reinforced grades. Among independent compounders Akro-Plastic has taken a prominent position in development of electrically neutral compounds The increasing number of sensors found on road


vehicles are subject to strict performance require- ments. Protection is particularly important for sensors that are exposed to harsh environments and must stand


32 INJECTION WORLD | March/April 2017 www.injectionworld.com


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