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DSM Extends Hydrolysis-resistant Bio-based PA Range for Auto Cooling Applications

Published on 2016-07-22. Author : SpecialChem

Royal DSM is extending its portfolio of high performance materials that answer the need in demanding automotive applications for hydrolysis resistance across a wide range of temperatures. The portfolio is targeted at numerous water-cooling related applications under the hood. The company is also announcing a new application for a hydrolysis-resistant grade of its high performance bio-based polyamide, EcoPaXX.

T connector

Polyamide - Inherently Resistant to Hydrolysis


Thomas Selberdinger
Thomas Selberdinger
DSM’s extensive portfolio of materials based on polyamides 410 and 4T (EcoPaXX® and ForTii® respectively) are all inherently resistant to hydrolysis. One particular grade, EcoPaXX Q-HG6/7, is very well suited for applications such as expansion tanks that need to resist coolants at high temperatures. It enables part weight to be cut by as much as 30% compared with polyamide 66.

The connector needs to withstand high internal pressures at temperatures of up to 135°C—something that is not possible with PA66. “EcoPaXX offers strength and reliability even in critical areas like the weld lines (areas where different flow fronts merge) in complex designs,” says Thomas Selberdinger, Sales Manager Automotive, at DSM.

For applications where even higher temperature resistance is required, DSM points to grades of ForTii. These have similar thermal properties as other polyphthalamides (PPAs), but with superior processability.

Now, DSM is adding to its range of high performance materials with compounds based on Xytron™ polyphenylene sulfide (PPS), which is also an inherently hydrolysis resistant polymer; these are intended for applications where very high dimensional stability is part of the requirements. In addition, DSM is introducing a new grade of Akulon® polyamide 66 that has very good resistance to water/glycol mixtures used at elevated temperatures in automotive cooling systems.

Polyamide 66 for Automotive Water Cooling Systems


“With the addition of all these new compounds, DSM now has a product pallet that covers just about every application where hydrolysis resistance is needed, whatever the operating temperature,” says Selberdinger. “We are well known for our strength in high-heat polyamides, but a PA66 grade with very good hydrolysis resistance was something that we lacked. I am proud to say that we have now filled that gap. On top of that, our new Xytron PPS compounds will help us to enter even more demanding applications where extreme stability is called for.”

T Connector in EcoPaXX
T Connector in EcoPaXX
The new Akulon PA66 is available in two versions: HR-HG6 and HR-HG7, containing 30% and 35% glass fiber reinforcement respectively. Both have shown good resistance to an aqueous solution of ethylene glycol under accelerated tests. They comply with OEM requirements to have a high retention of flexural strength after immersion in the solution for 1000h at 135°C. Applications targeted by the new Akulon grades include expansion tanks, air intake manifolds and oil pans with integrated cooling channels, and oil filter/cooler modules.

New Range of Inherently Hydrolysis-resistant PPS Compounds


DSM is currently carrying out final tests on newly developed Xytron PPS compounds in water/glycol solutions. “First results indicate a very promising performance in this field, and also with regard to heat and chemical resistance,” Selberdinger says.

DSM will be offering PPS compound formulations with both glass fiber reinforcement and mineral filler to provide the required characteristics for automotive components, not only in cooling systems, but also ignition, lighting, fuel, drive, and control systems. PPS has sufficient heat resistance for use in components operating in environments with temperatures constantly.

Meet the Extreme with DSM


DSM offers high-performing plastic solutions, technologies and expertise for the extreme demands of next-generation vehicles. These materials are a driving force in light-weighting, downsizing and e-mobility. On the road to zero emissions it’s time to think differently. To think beyond metal.

About DSM – Bright Science. Brighter Living.™


Royal DSM is a global science-based company active in health, nutrition and materials. By connecting its unique competences in life sciences and materials sciences DSM is driving economic prosperity, environmental progress and social advances to create sustainable value for all stakeholders simultaneously. DSM delivers innovative solutions that nourish, protect and improve performance in global markets such as food and dietary supplements, personal care, feed, medical devices, automotive, paints, electrical and electronics, life protection, alternative energy and bio-based materials. DSM and its associated companies deliver annual net sales of about €10 billion with approximately 25,000 employees. The company is listed on Euronext Amsterdam.

Source: DSM

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