Legacy Molding Blog

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  • Why Phoenix, Arizona Is a Growing Hub for Plastic Injection Molding

    When people think of U.S. manufacturing hubs, cities like Detroit, Chicago, and Los Angeles often come to mind first. But over the past decade, Phoenix, Arizona has quietly emerged as one of the fastest-growing centers for precision manufacturing — and plastic injection molding is leading the charge.

    A Strategic Location for Manufacturing

    Phoenix sits at the crossroads of major freight corridors connecting the West Coast, Texas, and Mexico. This strategic location means shorter shipping times and lower logistics costs for companies serving markets across the western United States and beyond. With two major interstate highways (I-10 and I-17) and proximity to the Port of Los Angeles, Phoenix-based manufacturers can move products efficiently.

    For injection molding customers, this translates directly into faster delivery of finished parts and more responsive supply chains.

    Business-Friendly Climate

    Arizona consistently ranks among the most business-friendly states in the country. Lower corporate tax rates, competitive energy costs, and a regulatory environment that supports manufacturing growth have attracted companies across aerospace, defense, medical devices, and semiconductor industries — all of which rely heavily on precision plastic components.

    This concentration of advanced industries creates a robust local demand for custom injection molding services, from prototype development through full-scale production.

    Access to a Skilled Workforce

    The Phoenix metro area is home to several universities and technical colleges producing graduates in mechanical engineering, materials science, and manufacturing technology. Combined with the region’s growing population, injection molders in Phoenix have access to a deep pool of skilled machinists, mold makers, process engineers, and quality technicians.

    The Semiconductor Effect

    The recent wave of semiconductor fabrication facilities being built in the Phoenix area has created a ripple effect across the entire manufacturing ecosystem. Chip fabs require enormous quantities of precision plastic components — from wafer carriers and chemical delivery systems to cleanroom fixtures and connector housings. This has boosted demand for local injection molding capacity and pushed the region’s manufacturing capabilities forward.

    Legacy Molding: Rooted in Phoenix for Over 40 Years

    At Legacy Molding, we’ve been part of Phoenix’s manufacturing community for more than four decades. We’ve watched the city grow from a regional market into a national manufacturing destination, and we’ve grown with it — investing in modern equipment, expanding our capabilities, and building the expertise to serve industries that demand nothing less than perfection.

    Our 30,000+ square-foot facility houses injection molding presses ranging from 30 to 720 tons, a full mold maintenance shop, and a quality lab equipped for first-article inspections and ongoing statistical process control. Whether you need 500 prototype parts or 5 million production units, we have the capacity and know-how to deliver.

    Partner with a Local Expert

    Choosing a local injection molding partner in Phoenix means faster communication, easier site visits, and the ability to collaborate closely on design optimization and quality control. If you’re looking for a reliable, experienced injection molder in the Phoenix area, Legacy Molding is ready to put our 40+ years of expertise to work for your project.

    Get in touch today to discuss your injection molding needs with our team.

  • 5 Key Factors When Choosing the Right Plastic Resin for Your Injection Molded Parts

    Selecting the right plastic resin is one of the most critical decisions in any injection molding project. The material you choose directly impacts part performance, durability, cost, and manufacturability. With hundreds of thermoplastic options available, narrowing down the best fit for your application can feel overwhelming — but it doesn’t have to be.

    Here are five essential factors to consider when choosing a plastic resin for your next injection molded part.

    1. Mechanical Requirements

    Start by defining the mechanical loads your part needs to withstand. Consider tensile strength, impact resistance, flexural modulus, and fatigue life. A structural bracket exposed to continuous stress requires a very different resin than a decorative cover that simply needs to look good.

    For high-strength applications, engineering resins like nylon (PA6/PA66), polycarbonate (PC), or glass-filled compounds offer excellent mechanical properties. For general-purpose parts, ABS and polypropylene (PP) provide a great balance of strength and cost.

    2. Operating Temperature Range

    Every resin has a heat deflection temperature (HDT) — the point at which it begins to deform under load. If your part lives under the hood of a vehicle or inside an electrical enclosure, you need a material that can handle sustained elevated temperatures without losing dimensional stability.

    PEEK and PPS handle temperatures above 400°F, while standard ABS starts softening around 200°F. Matching your resin’s thermal properties to your application environment prevents premature part failure.

    3. Chemical and Environmental Exposure

    Will your part contact solvents, oils, acids, or UV light? Chemical resistance varies dramatically between resins. Polypropylene and HDPE resist most chemicals but lack the strength of engineering plastics. Acetal (POM) handles fuels and solvents well while maintaining excellent dimensional stability.

    For outdoor applications, UV-stabilized grades or inherently UV-resistant materials like ASA prevent yellowing and brittleness from sun exposure.

    4. Regulatory and Compliance Needs

    Medical, food-contact, and aerospace parts must meet specific regulatory standards. FDA-compliant, USP Class VI, and ISO 10993 certifications narrow your resin options significantly. UL flame ratings (V-0, V-1, V-2) are mandatory for electrical and electronic housings.

    At Legacy Molding, we work with certified material suppliers and can guide you through the compliance landscape to ensure your parts meet all applicable standards.

    5. Cost and Production Volume

    Resin cost can range from under $1 per pound for commodity plastics like polypropylene to over $50 per pound for high-performance polymers like PEEK. When you’re running high volumes, even a small price difference per pound translates into significant savings.

    Often, a more affordable resin with the right additives (glass fiber reinforcement, flame retardants, UV stabilizers) can match the performance of a premium material at a fraction of the cost. Our engineering team specializes in finding these cost-effective alternatives without compromising part quality.

    Let Us Help You Choose

    Material selection doesn’t happen in isolation — it’s deeply connected to part design, mold design, and processing parameters. At Legacy Molding, we provide material selection guidance as part of every project, helping you balance performance, cost, and manufacturability from the start.

    Have a project in mind? Send us your requirements and we’ll recommend the ideal resin for your application.

  • What Is Custom Plastic Injection Molding? A Complete Guide for 2026

    Custom plastic injection molding is one of the most versatile and cost-effective manufacturing processes available today. Whether you’re producing medical device housings, automotive components, consumer electronics enclosures, or industrial parts, injection molding delivers the precision, repeatability, and scalability that modern manufacturing demands.

    How Does Injection Molding Work?

    At its core, plastic injection molding involves melting thermoplastic resin pellets and injecting the molten material into a precision-machined steel or aluminum mold under high pressure. Once the plastic cools and solidifies, the mold opens and the finished part is ejected. The entire cycle can take anywhere from a few seconds to a couple of minutes, depending on part size and complexity.

    The process breaks down into four key phases:

    1. Clamping — The two halves of the mold are securely closed under tonnage appropriate for the part size.
    2. Injection — Molten plastic is forced into the mold cavity through a runner system at controlled temperature and pressure.
    3. Cooling — The plastic solidifies inside the mold while cooling channels maintain consistent temperatures.
    4. Ejection — The mold opens and ejector pins push the finished part out of the cavity.

    Why Choose Custom Injection Molding?

    Unlike off-the-shelf parts, custom injection molding gives you complete control over part geometry, material selection, surface finish, and tolerances. This means your components are engineered specifically for your application — not adapted from a generic design.

    Key advantages include:

    • High production efficiency — Once the mold is built, per-unit costs drop dramatically at volume, making it ideal for runs of 1,000 to millions of parts.
    • Tight tolerances — Modern injection molding can hold tolerances as tight as ±0.001 inches, critical for medical and aerospace applications.
    • Material versatility — Choose from hundreds of engineering-grade thermoplastics, including ABS, polycarbonate, nylon, PEEK, and glass-filled compounds.
    • Complex geometries — Undercuts, living hinges, snap fits, and intricate internal features are all achievable with proper mold design.
    • Consistent quality — Every part comes out identical, with statistical process control ensuring batch-to-batch repeatability.

    Industries That Rely on Injection Molding

    Virtually every industry uses injection molded components. At Legacy Molding in Phoenix, Arizona, we serve clients across medical devices, automotive, aerospace, defense, consumer products, and industrial equipment sectors. Our experience spans decades of producing precision plastic parts that meet the most demanding specifications.

    Getting Started with Your Custom Project

    If you’re considering injection molding for your next project, the process typically begins with a design review. Our engineering team evaluates your CAD files for manufacturability, suggests optimizations to reduce cost and improve part quality, and helps you select the right material for your application’s mechanical, thermal, and chemical requirements.

    Ready to discuss your project? Contact Legacy Molding today for a free consultation and quote. With over 40 years of experience in custom plastic injection molding, we have the expertise to bring your designs to life — on time and on spec.