THERMOPLASTIC ELASTOMERS | MATERIALS
hood, RTP Company has released Nylabond 7091, describing it as a unique material formulated specifically for components that are exposed to high temperatures and aggressive fluids, effectively bridging the gap between traditional thermosets and underperforming thermoplastics. “Although engine compartments and components keep getting smaller, exposure to heat and fluids are still issues to mitigate,” it says.
Novel TPV
Nylabond 7091 is a TPV, but differs from traditional types, based on PP and partially vulcanised EPDM rubber. “It uses the highest performing rubber for heat and fluid resistance, vulcanised with a thermo- plastic engineering resin,” says Brian Gumbko, Global TPE Market Manager. He does not identify the rubber, nor the thermoplastic, although it can be assumed from the name that the latter is a polyamide. Historically, thermosets and TPVs capable of withstanding 125° C environments have been specified for automotive under-hood parts, Gumb- ko says. “However, many of these same compo- nents are now required to withstand long-term exposure to 150 °C in air and fluid immersion for the life of the vehicle or component. As a result, many part specifications have been written to require materials to withstand 2,000 hours or longer continuous exposure to 150°C hot air and oil. Spike temperatures of up to 175 °C can also be experi- enced in extreme under-hood conditions.” He says: “For applications with 150 °C exposure,
like air/fluid transport systems, vibration/isolation dampening, and sealing, thermosets such as vinyl methyl silicone (VMQ), polyacrylate (ACM), and ethylene acrylates (AEM) were traditionally used due to their cost-performance balance; but their performance was lacking. VMQ cannot be consid- ered an oil-resistant material; ACM and AEM suffer from long overall cure cycle and high specific gravity after compounding. Finally, thermoset elastomers are not readily recyclable.” Gumbko says: “Nylabond 7091 series materials can mimic thermoset properties and withstand long-term exposure to the most aggressive automotive fluids – engine oil, transmission fluid, and lubricating greases – for the life of the vehicle, even when those fluids are hot, making it one of the world’s highest performing thermoplastic elastomers.”
Nylabond 7091 materials, which can also be blow moulded, suit a wide range of applications, including automotive boots, transmission compo- nents, exclusion seals, air intake ducts and charge-
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Softening point of a traditional TPV and a copolyester versus RTP’s Nylabond 7091 Source: RTP Company
Long term heat resistance (ultimate tensile strength retention) of RTP’s Nylabond 7091 at various temperatures Source: RTP Company
air cooler ducts, and vibration isolators/mounts. RTP says the Nylabond7091 Series is far superior to conventional TPEs, polyamide elastomers, and copolyesters in applications that require exposure to automotive fluids. “In fact, tests show that components made from Nylabond 7091 far outper- form components made of silicone rubber and copolyester when exposed to oils and lubes at 150°C,” it says.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.unitedsoftplastics.com �
www.hexpol.com �
www.zylogelastocomp.com �
www.kraiburg-tpe.com �
www.avient.com �
www.lubrizol.com �
https://audiaelastomers.com �
www.mocom.eu �
www.kraton.com �
www.rtpcompany.com �
www.benvic.com
May 2021 | INJECTION WORLD 23
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