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SABIC’s new resin maintains dimensional stability in heat and humidity
Source:Adsale Plastics Network    Editor:JK    Date:04.Oct.2021

SABIC has introduced NORYL GTX 9500 resin, a new addition to a range of unfilled NORYL GTX resin grades. It retains a better balance of mechanical properties when exposed to heat and humidity typical of automotive under-hood environments, than polyamide (PA) resins (PA66 and PA6), as well as comparable high flow and high-temperature performance.

 

Its dimensional stability and mechanical property retention under a wider range of temperatures and humidity – together with high flow performance – can open opportunities for thin-wall designs that reduce weight.

 

Target applications for NORYL GTX 9500 resins include vehicle junction boxes, connectors and other applications requiring dimensional stability. These materials also demonstrate a potential for use as the base resin in carbon fiber-reinforced thermoplastic composites used in structural and body components, and for applications in the industrial, aerospace and marine markets.


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SABIC’s new NORYL GTX resin features very good dimensional stability in hot and humid conditions for automotive applications.


“Our global development teams excel in formulating thermoplastics with targeted properties that resolve longstanding customer challenges such as the propensity of nylon to soften under exposure to moisture,” said Darpan Parikh, global product management Leader, Resins & Compounds, SABIC’s Specialties business.

 

“We designed NORYL GTX 9500 resin to give our customers innovative new material options for applications that must retain their shape and performance in hot, humid environments. The launch of this new grade demonstrates our leadership in materials innovation and our focus on continuously improving and expanding our portfolio,” stated Shinsuke Nakamoto, senior business manager, NORYL Portfolio, Asia Pacific, SABIC’s Specialties business.

 

Specifically, the strong tendency of PA resins to absorb moisture and water, which is exacerbated by elevated temperatures, may cause softening, loss of stiffness and warpage. NORYL GTX 9500 resin offers significantly lower water and moisture uptake than PA, even under high heat conditions, up to 150 degrees Celsius.

 

In fact, SABIC testing demonstrated that NORYL GTX 9500 resin absorbed 21% less moisture at equilibrium than PA66, and 58% less than PA6.


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NORYL GTX 9500 resin shows at equilibrium a 21% moisture uptake reduction compared to PA66 and 58% compared to PA6.


With moisture absorption at equilibrium, SABIC’s NORYL GTX 9500 material surpassed PA in dimensional stability. NORYL GTX 9500 resin had a total dimensional change (flow direction and crossflow direction) at equilibrium of 0.29%, while PA66 has a total change of 84% and PA6 had a total change of 165% higher than NORYL GTX 9500 resin.

 

This improved dimensional stability offers benefits for moisture-sensitive applications, including reducing warpage to minimize scrap rates and enabling designs with thinner walls to support light-weighting.

 

NORYL GTX 9500 resin also demonstrates exceptional retention of mechanical properties – flexural modulus, tensile modulus and flexural strength – under wet conditions compared to PA66 and PA6. Furthermore, this material surpasses incumbent NORYL GTX grades based on PA in terms of water and moisture uptake, dimensional stability and property retention.

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