--- title: "Ditch the Die-Cast: Why Leading Engineers Are Replacing Aluminum in Structural Parts" description: Replace die-cast aluminum with Leona™ SG for 30% weight savings, lower costs, and high stiffness in brackets, pedals, seat frames, and more. image: https://blog.akplastics.com/hubfs/SG%20Blog%201%20Mirror%20Bracket.jpg --- # Ditch the Die-Cast: Why Leading Engineers Are Replacing Aluminum in Structural Parts ![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) February 11, 2026 ![Asahi Kasei's LEONA SG is perfect for metal replacement applications, like automotive mirror brackets.](https://blog.akplastics.com/hubfs/SG%20Blog%201%20Mirror%20Bracket.jpg) In the race to improve fuel efficiency, meet sustainability targets, and reduce manufacturing costs, every gram matters. For decades, die-cast aluminum has been the go-to material for structural vehicle components—from cross-members and brackets to seat frames and pedal arms. But now, innovative engineering resins like **LEONA™ SG** Nylon are changing the game. Engineers across the automotive, powersports, and heavy equipment industries are discovering they can achieve comparable strength to metal while shaving weight, simplifying production, and slashing costs by switching to advanced polyamide-based resins. #### **Why Aluminum Isn’t Always the Answer** Aluminum alloys have long been valued for their light weight and decent strength, but they come with serious limitations: These drawbacks make aluminum expensive and inflexible—especially when production volumes grow or part designs become more complex. #### **Enter LEONA™ SG: Lightweight Strength Without the Headaches** LEONA™ SG Nylon grades are semi-aromatic polyamide resins reinforced with 40–60% glass fiber, specifically engineered for metal replacement. These high-stiffness grades deliver **comparable mechanical performance to aluminum and magnesium**, but with significant manufacturing and design advantages: #### **Application Spotlight: Structural Brackets, Pedals &More** LEONA™ SG materials have proven success in replacing metal in a wide range of critical parts: #### **Beyond Weight Savings: What the Numbers Don’t Show** While weight reduction alone is a compelling reason to ditch die-cast, the **total cost of ownership** is where LEONA™ SG really shines.  Switching to injection-molded resins: This makes Leona™ SG a win for **both product engineering and operations teams**. #### **Ready to Rethink Metal?** If your team is exploring ways to optimize design, reduce weight, and eliminate costly metal processing steps, Leona™ SG is worth a closer look. Whether you’re developing EV platforms, upgrading off-road vehicles, or looking for alternatives to magnesium and aluminum, this high-performance resin can help you deliver lighter, stronger, and more cost-efficient parts. Ready to switch from heavy and costly metal to a better alternative? [Contact our technical experts today to request a sample or discuss how our formulations can meet your design requirements.](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) **Share:** [![Share on facebook](https://7528309.fs1.hubspotusercontent-na1.net/hub/7528309/hubfs/raw_assets/public/mV0_d-web-default-modules_hubspot/img/facebook-color.png?width=24&name=facebook-color.png) ](https://www.facebook.com/share.php?u=https%3A%2F%2Fblog.akplastics.com%2Fditch-the-die-cast-why-leading-engineers-are-replacing-aluminum-in-structural-parts%3Futm_medium%3Dsocial%26utm_source%3Dfacebook) [![Share on linkedin](https://7528302.fs1.hubspotusercontent-na1.net/hub/7528302/hubfs/raw_assets/public/mV0_d-web-default-modules_hubspot/img/linkedin-color.png?width=24&name=linkedin-color.png) ](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fblog.akplastics.com%2Fditch-the-die-cast-why-leading-engineers-are-replacing-aluminum-in-structural-parts%3Futm_medium%3Dsocial%26utm_source%3Dlinkedin) [![Share on twitter](https://7528304.fs1.hubspotusercontent-na1.net/hub/7528304/hubfs/raw_assets/public/mV0_d-web-default-modules_hubspot/img/twitter-color.png?width=24&name=twitter-color.png) ](https://twitter.com/intent/tweet?original_referer=https%3A%2F%2Fblog.akplastics.com%2Fditch-the-die-cast-why-leading-engineers-are-replacing-aluminum-in-structural-parts%3Futm_medium%3Dsocial%26utm_source%3Dtwitter&url=https%3A%2F%2Fblog.akplastics.com%2Fditch-the-die-cast-why-leading-engineers-are-replacing-aluminum-in-structural-parts%3Futm_medium%3Dsocial%26utm_source%3Dtwitter&source=tweetbutton&text=) ## 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) [Injection Molding](https://blog.akplastics.com/tag/injection-molding), [automotive](https://blog.akplastics.com/tag/automotive), [Asahi Kasei Plastics](https://blog.akplastics.com/tag/asahi-kasei-plastics), [Metal Replacement](https://blog.akplastics.com/tag/metal-replacement), [LEONA](https://blog.akplastics.com/tag/leona) ## Comments \ ## Related Posts \ [![Flame-retardant engineering plastic components used in automotive, electrical, and industrial applications comparing halogenated and non-halogenated material systems.](https://blog.akplastics.com/hubfs/Halogenated%20Blog.png) ](https://blog.akplastics.com/halogenated-vs.-non-halogenated-flame-retardants-understanding-the-tradeoffs) ### [Halogenated vs. Non-Halogenated Flame Retardants: Understanding the Tradeoffs](https://blog.akplastics.com/halogenated-vs.-non-halogenated-flame-retardants-understanding-the-tradeoffs) July 01, 2026 [![Solar junction box mounted on a photovoltaic panel using durable XYRON™ resin for weather resistance and electrical safety.](https://blog.akplastics.com/hubfs/Solar%20Blog%201.png) ](https://blog.akplastics.com/how-xyron-resins-enhance-solar-junction-box-efficiency-durability) ### [How XYRON™ Resins Enhance Solar Junction Box Efficiency & Durability](https://blog.akplastics.com/how-xyron-resins-enhance-solar-junction-box-efficiency-durability) June 24, 2026 [![Off-road vehicle driving over rugged terrain with lightweight structural components made from high-performance polyamide.](https://blog.akplastics.com/hubfs/Power%20Sports%20Blog%201.png) ](https://blog.akplastics.com/leona-sg-off-road-vehicle-metal-replacement) ### [Built for the Trail: How LEONA™ SG Supports Metal Replacement in Off-Road Vehicles](https://blog.akplastics.com/leona-sg-off-road-vehicle-metal-replacement) June 17, 2026 ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Tom Hanvey", "url" : "https://blog.akplastics.com/author/tom-hanvey" }, "dateModified" : "2026-02-11T15:15:03.397Z", "datePublished" : "2026-02-11T15:15:03.000Z", "headline" : "Ditch the Die-Cast: Why Leading Engineers Are Replacing Aluminum in Structural Parts", "image" : [ "https://blog.akplastics.com/hubfs/SG%20Blog%201%20Mirror%20Bracket.jpg" ], "mainEntityOfPage" : { "@id" : "https://blog.akplastics.com/ditch-the-die-cast-why-leading-engineers-are-replacing-aluminum-in-structural-parts", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.akplastics.com/hubfs/Asaclean%20Logo%20TM.jpg" }, "name" : "Asahi Kasei Plastics North America" } } ```