Comprehensive Plastic Injection Molding Services in South Portland, ME
Ronningen is proud to offer world-class plastic injection molding and manufacturing services to businesses in South Portland, Maine. With over 50 years of experience, we specialize in delivering high-quality, precision-molded plastic parts for industries like medical devices, consumer electronics, aerospace, and automotive. Our advanced facility is equipped with the latest injection molding technology, enabling us to efficiently handle projects of all sizes, from small prototypes to large-scale production.
In addition to injection molding, we offer a full suite of secondary services, including over molding, insert molding, machining, and ultrasonic welding. These services help streamline your production process, reduce lead times, and ensure high-quality results for every project. At Ronningen, we are committed to providing flexible and reliable manufacturing solutions that meet the unique needs of our South Portland clients.
Full-Service Plastic Manufacturing Solutions for South Portland Industries
Ronningen is dedicated to providing South Portland businesses with a complete range of plastic injection molding services. Our offerings include traditional injection molding, over molding, and insert molding, all designed to meet the specific needs of your project. We also specialize in secondary operations like machining, leak testing, pad printing, and electroplating, allowing you to receive fully finished parts ready for use.
Our facility is equipped with high-tonnage molding machines, allowing us to produce high-volume parts with tight tolerances. Whether you need a few hundred parts or millions, Ronningen delivers precision and efficiency, ensuring your project is completed on time and within budget. Our in-house capabilities reduce the need for third-party suppliers, providing you with faster turnaround times and more control over the production process.
Precision Manufacturing and Quality Control for South Portland, ME
At Ronningen, we use advanced technology and precision molding techniques to ensure the highest quality plastic parts for our South Portland clients. Our team utilizes high-tonnage injection molding machines, CNC equipment, and automated inspection systems to guarantee that every part meets the required specifications. We offer a range of manufacturing services, including ultrasonic welding, over molding, and structural foam molding, to accommodate your unique design and functional requirements.
Additionally, our team is experienced in providing secondary services such as custom cutting, machining, part marking, and packaging. With Ronningen’s integrated approach, you can trust that your parts will be produced with efficiency, precision, and high-quality results.
Why South Portland, ME Manufacturers Choose Ronningen
Ronningen is a trusted partner for South Portland manufacturers because we offer more than just plastic injection molding—we provide a full range of services that streamline your production process. From custom tooling and material selection to finishing services like electroplating and part marking, our team ensures every part is made to the highest standards. We specialize in complex molding applications such as over molding, insert molding, and structural foam molding, which allow us to meet your most demanding project requirements.
Our advanced in-house capabilities include machining, milling, and ultrasonic welding, enabling us to offer precision and durability for your parts. We also handle packaging, assembly, and shipping, ensuring that your parts are delivered on time and ready for use. Ronningen’s integrated services save you time, reduce costs, and increase the efficiency of your supply chain.
Serving South Portland with Fast and Reliable Manufacturing Solutions
Ronningen’s facility in South Portland is strategically positioned to serve local and regional businesses with fast, reliable plastic manufacturing solutions. Our team understands the urgency of today’s market, and we are committed to delivering high-quality parts with quick turnaround times. Whether you’re in need of rapid prototyping, low-volume production, or large-scale manufacturing, Ronningen has the equipment and expertise to meet your needs.
We offer integrated services including machining, custom cutting, packaging, and shipping, allowing us to deliver complete parts that are ready for immediate use. By providing all these services in-house, we eliminate the need for multiple suppliers, reducing delays and improving the efficiency of your production process.
Our Certifications




Our ISO 9001 certified quality management system is registered and certified by NSF International Strategic Registrations and based on a number of quality management principles including:
- A strong customer focus
- Support of top management
- Adherence to a process approach
- Continual improvement
Under the scope of our registration are the following services:
- Prototype plastic injection tooling for molded parts
- Engineering evaluation samples
- Pilot and production plastic components
Our accreditation from NSF provides assurance to our customers that our certified components and products comply with the technical requirements of ISO 9001.
QMMY2.E116158 Fabricated Parts – Component
Underwriters Laboratories is an independent product safety testing and certification organization working for public safety since 1894. Since its founding, U/L has held the reputation as the undisputed leader in product safety and certification, giving consumers peace of mind about the products they use.
("ITAR," 22 CFR 120-130) REGISTERED
All manufacturers of defense articles, related data, and defense services as defined on the United States Munitions List (Part 121 of ITAR) are required to register with the Directorate of Defense Trade Controls (DDTC). ITAR registration is a means to provide the U.S. Government with necessary information on who is involved in certain manufacturing, brokering, and exporting activities.
(MBP3)
Commitment to our air, land, and water quality is paramount at Ronningen. Since 1999, we've served as a Michigan Business Pollution Protection Partner, adopting pollution prevention policies, committing to reductions, and sharing our successes with other MBP3 members.
Our Comprehensive Manufacturing Services: Plastic Injection Molding & More
Assembly & Sub-Assembly
At Ronningen Research and Development, we provide expert Assembly & Sub-Assembly services for seamless integration of components. Whether it's simple assemblies or complex multi-part solutions, we ensure precision and efficiency in every process.
Custom Coloration
Our Custom Coloration services offer tailored color options to meet your design and branding needs. We use advanced Plastic Injection Molding techniques to ensure long-lasting, consistent colors for your products.
Custom Cutting Parts
Ronningen Research and Development specializes in Custom Cutting Parts using state-of-the-art machinery. We provide accurate cuts for a variety of materials, meeting the specific needs of your project.
Drilling
We offer high-precision Drilling services to create exact holes in various materials. Our advanced equipment ensures accuracy and quality for projects requiring tight tolerances and consistent results.
Electroplating
Our Electroplating services enhance part durability and corrosion resistance with high-quality metallic coatings. We provide superior finishes for applications in automotive, electronics, and more.
Heat Staking
Heat Staking at Ronningen Research and Development creates strong, reliable bonds between plastic components without the need for additional materials. This process is ideal for parts requiring secure assembly and durability.
Hot Stamping
Hot Stamping services provide a high-quality finish with precision and efficiency. We use advanced techniques to apply logos, designs, and text to parts, ensuring a clean and lasting imprint.
Insert Molding
Insert Molding allows us to mold plastic around metal or other materials to create strong, integrated components. This service provides enhanced functionality and durability for complex applications.
Labeling
We provide precise Labeling services that ensure clear, durable markings for traceability, branding, and compliance. Our labeling process guarantees that your parts are correctly identified and meet industry standards.
Leak Testing
Our Leak Testing services verify the integrity of your products, ensuring they meet safety standards. We provide airtight and watertight testing to prevent failures and guarantee quality.
Machining
We offer high-precision Machining services for custom parts. Using advanced CNC equipment, we deliver consistent, high-performance components for a variety of industries.
Milling
Our Milling services create intricate parts with high accuracy. We use advanced equipment to ensure precise cuts and finishes for your custom projects.
Over Molding
Over Molding at Ronningen Research and Development creates multi-material components for enhanced durability and functionality. We mold plastic over existing parts to meet complex design requirements.
Packaging, Custom
Our Custom Packaging services protect your products during transportation and storage. We offer tailored solutions to ensure your parts arrive safely and in excellent condition.
Pad Printing
We provide Pad Printing services for high-quality markings on various materials. Ideal for branding, labeling, and customization, our process ensures precise, durable prints.
Over Molding
Over Molding at Ronningen Research and Development creates multi-material components for enhanced durability and functionality. We mold plastic over existing parts to meet complex design requirements.
Packaging, Custom
Our Custom Packaging services protect your products during transportation and storage. We offer tailored solutions to ensure your parts arrive safely and in excellent condition.
Pad Printing
We provide Pad Printing services for high-quality markings on various materials. Ideal for branding, labeling, and customization, our process ensures precise, durable prints.
Part Marking
Our Part Marking services at Ronningen Research and Development ensure clear and accurate markings for identification and traceability. We use advanced techniques to apply markings that meet industry standards.
Painting
At Ronningen Research and Development, our Painting services enhance the aesthetic and protective qualities of your parts. We apply durable coatings for both functional and cosmetic purposes.
Silk-screening
We offer Silk-screening services at Ronningen Research and Development for durable, high-quality prints on parts. This process is ideal for logos, designs, and labels, providing precise results for a variety of materials.
Shielding
Our Shielding services at Ronningen Research and Development protect components from electromagnetic interference. We use advanced materials and techniques to ensure reliable performance and compliance with industry standards.
Shipping
At Ronningen Research and Development, we handle Shipping with care, ensuring that your products are securely packaged and delivered on time. Our reliable shipping services help you get your products to the market quickly and safely.
Spin Welding
Spin Welding services at Ronningen Research and Development provide strong, durable bonds for plastic parts. This technique is ideal for creating seamless joints without the need for additional materials.
Structural Foam Molding
We offer Structural Foam Molding at Ronningen Research and Development for lightweight, durable plastic parts. This service provides strong components with a reduced weight, ideal for applications that require high strength without the added bulk.
Taping
Our Taping services at Ronningen Research and Development are designed to provide secure adhesion and protection for your products. We offer custom taping solutions to meet the needs of various industries.
Trimming
At Ronningen Research and Development, we provide Trimming services to finish and refine your parts. Our precise trimming process ensures clean edges and perfect finishes for your molded components.
Ultrasonic Welding
Ultrasonic Welding at Ronningen Research and Development uses high-frequency sound waves to create strong, precise bonds between plastic parts. Ideal for delicate applications, this process ensures high-quality, durable results without the need for adhesives.
Frequently Asked Questions About Plastic Injection Molding in South Portland, ME
At Ronningen, we understand that choosing the right manufacturing partner is crucial for your project’s success. That’s why we’ve provided answers to some of the most frequently asked questions from businesses in South Portland, ME. We hope these answers will help clarify how we can support your manufacturing needs and ensure your parts are produced to the highest standards.
Q1: What types of services does Ronningen provide in South Portland?
Ronningen offers a comprehensive range of services, including plastic injection molding, over molding, insert molding, and structural foam molding. We also provide secondary services such as machining, electroplating, pad printing, part marking, and custom packaging. Our full-service approach allows us to handle every aspect of production, from mold design to finished parts ready for use.
Q2: Can Ronningen handle both small-batch prototypes and high-volume production?
Yes, Ronningen is equipped to handle both small-batch prototypes and large-volume production. Whether you need a few hundred parts for testing or millions of parts for mass production, we have the capabilities to deliver high-quality results. Our team ensures that quality and precision are maintained across all project sizes, helping you meet your production goals.
Q3: How does Ronningen ensure quality control during the manufacturing process?
We follow ISO 9001:2015 standards for quality control, utilizing advanced inspection systems such as vision cameras, CMMs, and leak testers to verify the accuracy of each part. Our team monitors the production process at every stage to ensure that every part meets the required specifications and performs as expected. Quality control is integral to everything we do at Ronningen.
Q4: What materials can Ronningen work with for plastic injection molding?
Ronningen works with a wide variety of materials, including polypropylene, ABS, polycarbonate, and engineered thermoplastics. Our team helps you select the best material based on your part’s functionality, performance, and regulatory requirements. We also offer custom coloration services to meet your specific design needs and enhance product appearance.
Q5: Does Ronningen offer prototyping services for new products?
Yes, Ronningen specializes in prototype plastic injection molding, helping businesses test and refine designs before committing to full-scale production. Our prototyping services allow you to validate materials, dimensions, and functional requirements quickly and efficiently. We work closely with you to ensure that the final product meets your expectations before moving forward with larger production runs.