Custom Plastic Injection Molding

Receive high-quality plastic molded parts quickly, with lead times starting at just five business days. Take advantage of professional engineering guidance and explore a variety of materials and finishes tailored to your project requirements.

Get Your Quote Now
See our “One Mold, Lifetime Production”

What is Plastic Injection Molding?

Plastic injection molding is a highly efficient manufacturing process used to produce plastic parts by injecting molten plastic material into a precisely engineered mold cavity. Once the material cools and solidifies, the mold opens, and the finished part is ejected. This process is repeated in quick cycles, making it ideal for creating high volumes of identical parts.

Why is Injection Molding Ideal?

  • Cost-Effective for Mass Production: After the mold is created, production costs decrease significantly, allowing for affordable, high-volume manufacturing.
  • Exceptional Accuracy: The same mold ensures every part maintains precise dimensions and consistent quality.
  • Material Versatility: Supports a wide range of thermoplastics, resins, and finishes to meet diverse industry requirements.
  • Scalable Production: Suitable for everything from prototypes to millions of production parts.

At NetProto, we combine precision engineering and advanced injection molding technology to deliver exceptional results for industries such as automotive, medical, electronics, and consumer products.

Choosing the Right Material for Your Project

NetProto offers a comprehensive range (over 600 materials) of thermoplastics to match your application needs. From durable engineering-grade plastics to lightweight, flexible resins, we ensure your parts achieve the ideal performance and aesthetics.

Common Materials We Offer

ABS (Acrylonitrile Butadiene Styrene): Tough, impact-resistant material ideal for consumer electronics and automotive parts.

Polypropylene (PP): Lightweight, chemical-resistant, and widely used for packaging, medical, and automotive applications.

Polycarbonate (PC): High strength and optical clarity, perfect for transparent components like lenses and housings.

Nylon (PA): Strong, wear-resistant industrial parts and gears material.

PBT, PE, PET, and More: A variety of thermoplastics designed for custom applications..

Explore All Material Options

Plastic Injection Molding Surface Finish Options

Selecting the right surface finish for your injection molded parts ensures the perfect balance of aesthetics, functionality, and durability. Surface finishes enhance the appearance and play a crucial role in reducing friction, aiding part release, and improving overall performance.

Below is a chart of standard surface finish options, including guides and common applications:

Learn More

Secondary Operations

At NetProto, we go beyond delivering high-quality injection molded parts. Our comprehensive secondary operations ensure your parts meet the exact specifications, aesthetics, and functionality required for your application. From enhancing performance to achieving the desired finish, our post-molding services deliver value at every step

Our Secondary Operation Capabilities

–Painting & Coating: Add custom colors, protective coatings, or specialized finishes to improve part durability and aesthetics.

–Pad Printing & Silk Screening: Apply logos, graphics, or text directly onto molded parts with precision and long-lasting quality.

–Ultrasonic Welding: Bond plastic parts together seamlessly without needing adhesives, ensuring strength and reliability.

–Assembly & Sub-Assembly: Streamline your production process with assembly services that include part joining, hardware installation, and packaging.

–Drilling & Tapping: Enhance functionality by adding precision holes or threads for assembly requirements.

–Heat Staking & Insertion: Integrate metal inserts into plastic parts for applications requiring added strength or fastening capabilities.

–Polishing & Deburring: Achieve smooth surfaces and eliminate sharp edges to enhance part appearance and safety.

–Custom Packaging: Tailored packaging solutions protect your parts during shipping and ensure they arrive ready for use.

Learn More

Quality Inspections

At NetProto, quality is at the heart of everything we do. We understand that delivering injection molded parts with precision, consistency, and durability is essential to your project’s success. That’s why we implement rigorous quality inspection processes throughout every stage of production to ensure your parts meet the highest industry standards.
Our Quality Inspection Process
Incoming Material Inspection:
Every project begins with thoroughly inspecting raw materials to ensure they meet the required quality, consistency, and performance specifications.
Critical-to-Quality (CTQ) Dimensions:
We focus on dimensions and features that are most critical to the functionality and performance of your parts.
Visual & Surface Finish Inspections:
Each part undergoes visual inspection to ensure cosmetic quality, identifying defects like warping, surface irregularities, or inconsistencies in finish.
Final Inspection & Reports:
Before shipment, parts are subject to a final inspection. We provide comprehensive quality reports such as:
First Article Inspection (FAI)
Process Capability Reports
Material Certifications

Learn More

How Does Plastic Injection Molding Work?

Plastic injection molding is a streamlined process designed to produce high-quality, repeatable parts with precision and efficiency. At NetProto, we combine cutting-edge technology, expert consultation, and optimized processes to ensure every part meets your exact specifications.

Step-by-Step Overview

Design Consultation & DFM Analysis:
Before production begins, we provide comprehensive Design for Manufacturability (DFM) feedback to help you optimize your design, identify potential issues, and ensure the mold is production-ready.

Material Preparation:
Thermoplastic resin pellets are loaded into a heated barrel, where they are melted, compressed, and prepared for injection.

Injection Process:
The molten plastic is injected into a precisely designed mold cavity under controlled pressure and speed. This ensures the mold is filled uniformly to avoid defects or inconsistencies.

Cooling & Solidification:
Once the mold is filled, the plastic cools and solidifies to form the desired part. Our process ensures dimensional accuracy and material stability during this critical stage.

Ejection & Quality Inspection:
Ejector pins carefully remove the cooled part from the mold, and every part undergoes rigorous quality inspections.

Final Verification:
Critical-to-quality (CTQ) dimensions are analyzed, and we provide First Article Inspection (FAI) reports process capability studies, and quality assurance documentation to validate every production run.

Custom Injection Moldings Design Guidelines

Designing for injection molding requires precision and strategic planning to ensure high-quality parts, optimal performance, and cost efficiency. At NetProto, we provide clear design guidelines to help you achieve parts that are both functional and manufacturable.

Why Design Guidelines Matter
Adhering to these design principles ensures:
Improved Manufacturability: Reduce defects, tooling complexity, and production costs.
Enhanced Part Quality: Minimize warping, voids, and cosmetic imperfections.
Faster Lead Times: Optimize designs for smoother production and shorter cycles

Get Your Quote Now

Scroll to Top