MATERIALS | HIGH TEMPERATURE PLASTICS
ing mechanical and thermal performance require- ments together with maintaining electrical properties. Eurotec has, for example, developed specific grades for electric motor applications. TecotekES20 GR30 NL and TecotekEP20 GR20
NL (20 and 30% glass fibre reinforced, natural PESU grades) are approved by several global OEMs use in rotor end caps. TecotronXS20 GR40 BK009 (40% glass fibre reinforced, black PPS), TecomidNT40 GD40 BK009 XA61 (40% glass fibre reinforced, flame retardant and heat stabilised PPS), and TecomidNT40 GR30 BK009 XA61 (30% glass fibre reinforced, flame retardant and heat stabilised PPA) are said to be suitable for motor brush holders. Some high performance polymers also offer
Temperature performance of Ascend’s Starflam X-Protect FR PA66. Source: Ascend Performance Materials
containing recyclate. “We’ve seen higher demand for sustainable options,” says Weishalla. “Our high temperature product portfolio continues to expand with more options containing recycled content.”
Limiting development According to Buket Turan, Technical Marketing Manager at Turkish compounder Eurotec Engi- neering Plastics, high temperature resistance is one of the key performance parameters that limits use of plastics in sectors such as automotive and electronics. Developing compounds to overcome this limitation is a key part of its business and it currently offers polyphthalamide (PPA), polyphe- nylene sulphide (PPS), polyetheretherketone (PEEK) and polyaryl sulphones (PES, PPSU, PSU) under the Tecomid HT, Tecotron XS, Tecopeek PK and Tecotek ES, Tecotek EP and Tecotek EU brands. PPA, PPS and PEEK are all used in automotive ignition components and underhood sensors, as well as in sockets and coils in electronic systems, where their high continuous use temperatures allow retention of mechanical properties. “Tecomid HT and Tecotron XS can provide continuous use temperatures up to 180°C and 210°C and Eurotec has many ready and proven grades for the automo- tive industry,” says Turan. “Tecomid HT NT40 GD40 BK009 XA61, a 40% glass fibre reinforced, flame retardant and heat stabilised PPA grade, is being currently used by a well-known automotive OEM for an inverter housing application where standard PBT and PET materials cannot provide the required continuous use temperature.” Electric vehicles are providing further opportuni- ties, Turan says, due to the need to meet demand-
36 COMPOUNDING WORLD | August 2023
inherently flame retardant behaviour, allowing them to meet stringent aviation standards such as OSU, NBS and FAR, which require low heat release, and low smoke and toxicity. Turan says Eurotec is one of the raw material suppliers to Turkish airlines and has a large product range intended for aviation industry applications. Polyaryl sulphones are preferable over PEEK due to their cost advan- tage and good flame behaviour. Turan says Eurotec has a number of suitable grades, including Tecotek ES20 WH100 HR 0A (white, low heat release PESU) and TecotekEP20 WH100 HR 0C (white, low heat release PPSU). Both meet OSU heat release requirements with OSU 55/55 and OSU 65/65 ratings, respectively. Where higher service temperatures are required PEEK is the optimal material, withstanding up to 260°C. Tecopeek grades also stand out for their usability in broader metal replacement applications due to their favourable combination of lightness, high thermal resistance and mechanical properties, Turan says. Tecopeek PK40 CR30 BK111 offers the rigidity and tensile strength required for applica- tions such as gears, bearing rings and pump components. Tecopeek PK40 CR30 BK111 RT 0D, with a tensile strength of 23,500 MPa and 215 MPa, is tailored to high temperature duties involving exposure to constant wear, such as chain bushings in a textile machine.
Safer performance Performance polyamide producer Ascend Perfor- mance Materials’ Starflam X-Protect is a flame retardant PA66 designed to help automotive engineers advance both safety and performance, says the company. Typical applications include modules, barriers, high-voltage insulators, struc- tural elements, vents and pressure relief valves. Starflam X-Protect parts offer extreme heat resist- ance well beyond that of conventional flame-re-
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