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MATERIALS | PPS COMPOUNDS


Wear rate @ 25N / 10^6


(mm3


/N.m)


Dynamic coefficient of friction €25N


Table 3: Wear and dynamic friction coefficient of Eurostar’s Star L PPS 30Y D51F grade, which contains carbon fibre and PTFE, compared to a reference grade


compounds in collaboration with global automotive parts supplier Hyundai Mobis. It says Ecotran – a special glass fibre reinforced PPS – is the first material in the global auto industry that addresses the problem of headlamp haze, which it says is a chronic headlight issue. The company attributes this to the generation of volatiles when the temperature inside the headlamp space rises to more than 200°C. On cooling, the gas condenses and adheres to the interior surfaces, forming a thin film layer that interferes with light projection. Meanwhile, in early 2018 Teijin launched the Solfiga PPS compounds, which are based on Initz’s resin technology. Production takes place at Teijin’s Mihara Plant in Hiroshima Prefecture. Teijin is expecting Solfiga sales to reach around $260m by 2025. It also plans to produce Solfiga products in China and Thailand. The full Solfiga line-up incorporates a variety of


Teijin high-performance reinforcements, as well as a specialised polycarbonate (PC) resin. The product portfolio includes a carbon fibre/PPS grade that offers high strength, high tenacity and conductivity for structural parts, as well as an aramid fibre/PPS grade providing resistance to abrasion, wear and shock in gear and sliding parts.


Managing wear


Independent compounders are also upping their game in PPS. “Brittleness and wear are two aspects where many standard grades of PPS fail to deliver. Techmer PM has developed several grades of PPS which have better impact and wear properties over traditional off the shelf grades of PPS,” says Techmer PM Director of Application Development Jack Chiang. “Recently a customer in the oil services industry came to us to help them improve the drop strength of oil well plugs; which were continuously being damaged before installation during shipping and


36 COMPOUNDING WORLD | April 2019


Source: Eurostar Engineering Plastics


the installation process. The customer used our Hifill PPS IM to improve the impact strength, and they have since seen a drastic drop in damaged returns,” he says. “Techmer PM can modify PPS with reinforcements, custom colours, and other specialty products to fit specific applications and design goals.” As part of its Star L product line, Eurostar Engineering Plastics has co-developed with CETIM (the technology institute of mechanics based at Senlis in France ) a number of self- lubricated PPS grades for highly demanding applications. These have been benchmarked against a best-in-class semi-finished self-lubricated PPS grade for bearing applications using a Cameron Plint tribometer and procedures described in ASTM G-133. The Star L PPS D93F compound contains aramid


fibre and PTFE; the Star L PPS 30Y D51F also contains PTFE but is reinforced with carbon fibre. Both are said to have shown a wear rate to the limit of measurable value of the tribometer. “These grades found application for bearing running at elevated temperatures. They were also found to be very insensitive to moisture,” says Alexis Chopin, Head of Technology at the company.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.dic-global.com � www.solvay.com � www.celanese.com � www.toray.com � www.tosoh.com � www.polyplastics.com � www.radicigroup.com � www.dsmep.com � www.initzpps.com � www.teijin.com � www.techmerpm.com � www.eurostar-ep.com


www.compoundingworld.com


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