---
title: "Redefining Electrical Connectors: The Rise of Engineering Plastics"
description: Learn how LEONA™ SN Series and XYRON™ 644Z are redefining electrical connector design with flame retardancy, durability, and sustainability.
image: https://blog.akplastics.com/hubfs/Connector%20Blog%20Photo%20-%209.jpg
---

# Redefining Electrical Connectors: The Rise of Engineering Plastics

![Tom Hanvey](https://blog.akplastics.com/hs-fs/hubfs/1570135534076.jpg?width=40&height=40&name=1570135534076.jpg) [ Tom Hanvey ](https://blog.akplastics.com/author/tom-hanvey) 

 October 29, 2025 

![LEONA and XYRON plastics are perfect for injection molded connectors.](https://blog.akplastics.com/hubfs/Connector%20Blog%20Photo%20-%209.jpg)

 

## Why Connector Material Choice Matters More Than Ever

In today's high-tech world, **electrical connectors** are everywhere—from electric vehicles and solar panels to industrial automation systems. These small components are responsible for reliably transferring power and signals under demanding conditions. But not all connector materials are created equal.

Historically, many manufacturers relied on metals like brass or beryllium copper. While strong and conductive, these materials come with trade-offs: they are prone to corrosion, require complex manufacturing processes, and increase product weight. With modern applications demanding better **performance, safety, and sustainability**, the industry is shifting toward **high-performance engineering plastics**—and for good reason.

### The Rise of Advanced Engineering Plastics for Connectors

**Engineering resins** like **LEONA™ SN Series** and **XYRON™ 644Z**, developed by Asahi Kasei, are reshaping the landscape of electrical connector design. These materials outperform traditional options across nearly every metric:

- **Flame retardancy:** Both LEONA™ SN and XYRON™ 644Z meet or exceed UL94 V-0 standards without relying on halogens or red phosphorus.
- **Weather and chemical resistance:** Excellent durability against moisture, UV exposure, and harsh chemicals ensures performance in tough environments.
- **Electrical insulation:** High CTI and low dielectric loss help protect sensitive electronics from failure.
- **Sustainability:** These halogen-free, recyclable materials contribute to greener, safer product designs.

### LEONA™ SN Series: Built for High-Voltage, High-Safety Applications

Asahi Kasei’s **LEONA™ SN Series** is a **next-generation PA66+6I resin** tailored for high-voltage applications. What makes it a standout?

- Achieves **UL94 V-0 flame retardancy at 0.75 mm**—without halogens or red phosphorus.
- Offers **CTI of 600V** and **GWIT of 750°C**, providing exceptional electrical safety.
- Performs under moisture and chemical exposure, ensuring **long-term mechanical integrity**.
- Optimized for **laser welding and marking**, making it ideal for mass production environments.

**Use cases include**:

- **EV battery connectors**, where safety and flame resistance are critical.
- **Bus bar covers**, which require strong electrical insulation.
- **Rail applications**, where it meets EN 45545-2 HL3 standards for fire safety.

 

### XYRON™ 644Z: The High-Performance mPPE for Next-Gen Connectors

**XYRON™ 644Z** is a modified polyphenylene ether (**mPPE**) resin that provides a unique balance of performance and processability. It's designed for high-voltage connector applications where **lightweight, flame retardant, and UV-resistant** materials are needed.

Key benefits:

- **Inherent flame retardancy**, rated UL94 V-0 and 5VA without additional additives.
- Maintains **dimensional stability** even in humid conditions.
- Excels in **solar power** and **EV battery storage** applications where long-term reliability is crucial.
- **Recyclable and lightweight**, supporting sustainability goals and reducing carbon footprint.

### More Than Just Performance: A Sustainable Choice

Connector manufacturers are under increasing pressure to improve not just product performance, but also **environmental impact**. Both LEONA™ SN Series and XYRON™ 644Z are free from halogens and red phosphorus, helping reduce toxic emissions and comply with global environmental regulations.

These materials also:

- Lower the **carbon footprint** due to more energy-efficient processing.
- Reduce waste by extending product life and minimizing failures.
- Support **closed-loop manufacturing** through recyclability.

### Ready to Upgrade Your Connector Materials?

The future of electrical connectors lies in smarter materials—ones that combine safety, efficiency, and sustainability. **LEONA™ SN Series** and **XYRON™ 644Z** deliver across the board, making them ideal choices for automotive, solar, industrial, and high-voltage electrical systems.

### Interested in testing these materials for your next project?

**Contact our experts today** to request free samples and get technical support tailored to your application.

If you're looking for expert guidance on selecting durable, high-performance materials for connectors, our team is available to help.    [**Contact us today** to learn more about how our engineered plastics can power your next project](https://blog.akplastics.com/contact-materials-expert).

## Help Us. Help You

Superior Performance. White Glove Service. Unrivaled Support. Learn Why Switching to Asahi Kasei Plastics North America's materials is Stress-Free.

[ Talk to a Materials Expert ](https://blog.akplastics.com/contact-materials-expert)

[ Technical Documents ](https://www.asahi-kasei-plastics.com/en/products/gradesearch/)

![Why Purging Page Header Pic-1](https://blog.akplastics.com/hubfs/Why%20Purging%20Page%20Header%20Pic-1.jpg)

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## Tom Hanvey

\  
Tom Hanvey is the Associate Director of Marketing & Sustainability at Plastics North America. Before joining APNA, he worked as the Senior Marketing Manager for Asaclean Purging Compounds. He's worked in the plastics industry for over 10 years and focuses on recyclable resins and on the inbound marketing side, providing easy-to-digest content to Tiers and OEMs looking for an edge on their competition.

[tom.hanvey@akplastics.com](mailto:tom.hanvey@akplastics.com)

 

[Follow us on Facebook ](https://www.asaclean.com/en/apna-plastics-blog-insights-and-solutions-for-manufacturers/www.asaclean.com) [Follow us on LinkedIn ](https://www.linkedin.com/in/thomashanvey/?original_referer=https%3A%2F%2Fwww.asaclean.com%2Fen%2Fapna-plastics-blog-insights-and-solutions-for-manufacturers%2Fthe-vanguard-in-stress-whitening-prevention-for-high-end-furniture)

[Asahi Kasei Plastics](https://blog.akplastics.com/tag/asahi-kasei-plastics), [Connectors](https://blog.akplastics.com/tag/connectors), [XYRON](https://blog.akplastics.com/tag/xyron), [LEONA](https://blog.akplastics.com/tag/leona), [Nylon](https://blog.akplastics.com/tag/nylon)

## Comments

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