MATERIALS | HIGH TEMPERATURE PLASTICS


The two graphs demonstrate the performance of the new FZ-2140-T3 PPS material when compared to both standard hydrolysis stabilisation and non-stabilised PPS compounds (tensile strength and knit line tensile strength after 3000 h in G13/water 50/50 mixture at 135°C)


strength, stiffness, and impact resistance similar to standard 40% glass fibre reinforced grades, but with a density 9% lower, he says. EVs are the future, but it should not be forgotten


that there is still plenty of life left in the internal combustion engine. In a recent blog, Russell Bloomfield, General Technical Service Engineer with DSM, discussed challenges for materials used in turbo-charged engines. He notes that some analysts predict the global automotive turbocharge market to reach $24.2bn by 2023 with 7.97% compound annual growth rate. “New materials are needed to meet both fuel


efficiency and under the hood space targets — ma- terials need to have a better chemical resistance, higher peak temperature performance, and long-term heat aging performance at elevated temperatures,” he says. Integrating the charge air cooler (CAC) into the


air intake manifold (AIM) reduces the length of pipe previously needed to reach the air-to-air cooler in the front of the vehicle — this leads to an increase in engine responsiveness, Bloomfield notes. “This drives up the temperature in the AIM (currently up to 230°C) and the mechanical requirements for the materials used.” Bloomfield highlights DSM’s Diablo technology,


improving the long-term temperature resistance of materials such as Stanyl PA46 and also Akulon PA66. “Compared to first generation Diablo offerings,


Stanyl Diablo HDT2700 has an improved Heat Deflection Temperature, which is an indicator of peak temperature capability,” he notes. “Stanyl Diablo HDT2700 also offers best-in-class weld strength and ensures part integrity under pressure pulsation loads. It maintains high stiffness, even


46 INJECTION WORLD | September 2019


Source: Sun Chemical


while exposed to continuous-use temperatures up to 230°C tested up to 3,000 hours.”


For medical Away from industrial applications,Celanese says its evolving portfolio of high-heat polymers and technologies is bringing innovative solutions to customers in healthcare. Its Vectra MT Liquid Crystal Polymer (LCP), for example, is said to be highly beneficial for electrosurgical instruments, thanks to the thermal insulation provided to interior electronics and power supply. “Vectra MT LCP as well as Fortron MT PPS and Celapex PEEK enable a more efficient sterilisation with lower costs and quicker re-utilisation time thanks to the compatibility with high-tempera- ture autoclave sterilisation,” says a representative. Fortron is also claimed to be the material of choice for minimally invasive surgical tools such as forceps, thanks to its high temperature and dimensional stability over repeated cleaning and sterilisation cycles. “Fortron MT PPS has extraordi- nary dielectric and insulation properties which make it an ideal choice for electrosurgical imple- ments as well,” says the representative. Fortron, Vectra and Celapex retain superior mechanical properties after numerous sterilisation cycles, including steam and dry heat sterilisation. PPS and LCP combine heat resistance with a high CTI: around 200°C for Vectra (Class IIIa), and around 150°C for Fortron and Celapex (Class IIIb). This is a particularly important feature in high frequency surgery. Another example cited for Vectra MT is in the internal components in inhaled nicotine devices. “The excellent dimensional stability required by the application in thermal shock and high temperature/


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