Cultivating Excellence in Plastics Injection Molding Services in China



Injection molding, a widely favored manufacturing process, is instrumental in producing large quantities of plastic parts using thermoplastics. This intricate process involves melting plastic, injecting it into molds, and repeating this cycle to create numerous identical parts. Besides, injection molding is also applied to liquid silicone parts using thermoset materials. At GEMS Manufacturing, we are equipped with both plastic and liquid silicone molding machines to fulfill clients’ demand. We have honed this craft to perfection.


Custom Injection Molding in China with GEMS-MFG


1. Our Commitment to Precision

Whether you require a single part or a million, GEMS Manufacturing boasts a Scientific Production Molding Program designed to uphold the utmost precision and punctuality throughout your project. Our dedication to accuracy is not a mere promise but an integrated system of checks and balances, ensuring that each part meets stringent quality standards.

2. The Palette of Thermoplastics

Our expertise extends to a vast array of thermoplastic materials, encompassing both engineering and commodity grades. The ever-expanding world of plastic materials offers myriad choices, and we remain at the forefront of innovation. Among the materials we proficiently work with are:

  • ABS: Acrylonitrile Butadiene Styrene
  • PC/ABS: Polycarbonate/Acrylonitrile Butadiene Styrene
  • Nylon: Polyamide
  • Acrylic: Polymethyl Methacrylate (PMMA)
  • Acetal: Polyoxymethylene (POM)
  • Polyester
  • Polystyrene
  • Polyethylene
  • Polypropylene
  • PPO: Polyphenylene Oxide
  • PPS: Polyphenylene Sulfide
  • Liquid Silicone Rubbers

3. Purpose-Driven Materials

In addition to these material grades, GEMS Manufacturing offers specialized materials crafted for specific industrial needs. Our repertoire includes:

  • Food-Grade Materials: Ensuring safety and compliance for applications involving food contact.
  • Medical-Grade Materials: Holding UL yellow card listings, guaranteeing adherence to the highest medical standards.
  • Automotive-Grade Materials: Compliant with the rigorous demands of the automotive industry.

4. Augmenting Properties with Additives

To further enhance material properties, we have mastered the art of incorporating various additives into the manufacturing process. These additives serve to fortify specific characteristics, making them suitable for diverse applications. Our repertoire of additives includes:

  • Glass: Available in both short and long fiber formats.
  • Carbon: Enhancing strength and durability.
  • Conductive and Non-Conductive Additives: Tailored to meet specific electrical conductivity requirements.
  • Anti-Static Additives: Essential for applications where static electricity can pose risks.
  • Anti-Microbial Agents: Ensuring hygiene and safety.
  • Fire Retardant Compounds: Vital for applications where fire resistance is critical.
  • Lubricative Additives: Reducing friction and enhancing performance.
  • Wear-Resistant Additives: Extending the lifespan of components subjected to wear.
  • Talc and Calcium: Used for reinforcing and improving stiffness.
  • UV Stabilizers: Essential for components exposed to outdoor environments.

5. A Spectrum of Colors

At GEMS Manufacturing, we recognize the importance of aesthetics. To ensure your components meet your visual specifications, we offer an extensive array of colors. Our palette encompasses every shade in the rainbow, allowing us to match any hue you desire.

6. Precision, Quality, and Versatility in Injection Molding

Precision, quality, and versatility define our approach to plastics injection molding services in China. We’re not just your manufacturing partner; we’re your solution. With a commitment to innovation and an unwavering dedication to quality, GEMS Manufacturing is your trusted source for turning plastic materials into precision-engineered components that meet and exceed your expectations.

GEMS-MFG’S China Injection Molding Services


Our injection molding services encompass a wide range of capabilities, ensuring that we can meet the diverse needs of our clients. Here’s a closer look at our injection molding offerings:

  1. Precision Tooling and Mold Design

Our skilled team specializes in designing precision molds tailored to your specific part requirements. We employ cutting-edge CAD/CAM software and CNC machining techniques to create molds with intricate details and tight tolerances. These molds serve as the foundation for producing high-quality plastic parts.

  1. Material Selection Expertise

Selecting the right material for your project is critical. We offer comprehensive material selection expertise, helping you choose from a wide range of thermoplastic materials. Whether it’s engineering-grade plastics for structural components or commodity-grade materials for everyday products, we ensure the ideal material is employed.

  1. Prototyping Services

Before full-scale production, we provide prototyping services to validate designs and assess functionality. Our rapid prototyping capabilities allow for quick iterations and adjustments, ensuring your final product meets your exact specifications.

  1. High-Volume Production

From small to large production runs, GEMS Manufacturing is equipped to handle your volume requirements. Our injection molding machines are capable of producing thousands to millions of parts with precision and consistency.

  1. Quality Assurance

Quality is the cornerstone of our injection molding services. We employ advanced inspection and quality control processes to ensure every part meets your stringent requirements. Our commitment to quality extends from the choice of materials to the final inspection of finished components.

  1. Secondary Operations

In addition to injection molding, we offer secondary operations such as assembly, ultrasonic welding, pad printing, and more. These services provide a comprehensive solution, reducing the need for multiple suppliers and streamlining your production process.

Benefits of our injection molding service @GEMS-MFG


Injection molding service offer unparalleled advantages, making it a preferred choice for the mass production of plastic and silicone parts. Let’s delve into more details for each of the benefits of injection molding services:

  1. High Efficiency and Cost Effectiveness

One significant benefit lies in the high efficiency and speed of the process. With cycle times ranging from seconds to minutes, injection molding facilitates rapid production, further enhanced by the ability to manufacture multiple parts simultaneously. This efficiency is particularly advantageous for industries requiring large quantities of identical components. The cost-effectiveness of injection molding for mass production is another compelling advantage. While initial tooling and mold setup costs may be relatively high, they are quickly amortized over the production of vast quantities, leading to significantly lower per-unit costs. This cost-effectiveness is amplified by the economies of scale achieved through the continuous production of intricate and complex parts.

  1. Design flexibility and Wide Material Selection

Design flexibility is a hallmark of injection molding, enabling the creation of complex part geometries with precision. The process accommodates features like undercuts, threads, and varying wall thicknesses, offering a versatile solution for diverse applications. Furthermore, the wide material selection available in injection molding allows for the use of various thermoplastic and thermosetting materials, each with distinct mechanical, thermal, and chemical properties. This versatility extends to the incorporation of additives, such as fillers and reinforcements, enhancing material characteristics to meet specific requirements.

  1. High Precision and Consistency

The high precision and consistency of injection molding contribute to its appeal. Advanced control systems in injection molding machines ensure tight tolerances and dimensional accuracy, while precision-engineered tools and molds maintain consistent part quality throughout production runs. Waste reduction is another environmental advantage, as the efficient use of materials minimizes scrap. Excess material from one cycle can be reground and reused in subsequent cycles, aligning with sustainable manufacturing practices.

  1. Automation and Scalability

Automation plays a pivotal role in injection molding, providing benefits such as robotic part removal, mold changing, and quality inspection. This not only increases production rates but also reduces labor costs and enhances overall efficiency. Scalability is inherent in injection molding, allowing for seamless transitions between low-volume and high-volume production based on demand.

  1. Surface Finish and Appearance

Surface finish and appearance are notable strengths of injection molding. Parts often emerge with a smooth and high-quality surface finish directly from the mold, reducing the need for additional finishing processes. Mold design and surface treatments further contribute to achieving specific appearances, including a variety of colors and finishes.

  1. Consistent Quality

Consistent quality is a hallmark of injection molding, supported by real-time monitoring of process parameters and quality control measures. Statistical process control techniques identify and address variations in production, ensuring uniformity and reliability in the final output.

  1. Reduced Assembly Requirements

Lastly, the reduced need for post-molding assembly processes is a practical advantage. Complex assemblies with multiple components can be seamlessly integrated into a single injection-molded part, streamlining the manufacturing process and enhancing overall cost-effectiveness.

Your Trusted Partner for Injection Molding in China


At GEMS Manufacturing, we understand that your success hinges on the quality, precision, and efficiency of your plastic components. As your trusted partner for injection molding services in China, we’re dedicated to delivering solutions that meet and exceed your expectations. Whether you’re in the automotive, electronics, medical, or consumer goods industry, we have the expertise and capabilities to bring your projects to life.

Let us be the driving force behind your injection molding needs. Partner with GEMS Manufacturing for precision, quality, and versatility that elevate your products and empower your business. You can reach a customer service representative by calling, sending us an email, or submitting the online form. Our team is looking forward to working with you.



Integrated Factory Resources

We are your one-stop manufacturing solution provider for customized products with the joint effort & support from our 120 partnership subcontractors mainly for the production of metals & plastics. We can expand much faster but the top management decide to keep GEMS a compact, dedicated and professional company, which allows our team to really focus and deliver on your projects without any excuse or compromise. We strive to be a long-term, reliable and trustworthy partner of our customers rather than just being a contractor, and look forward to growing the company with customers’ success.

Manufacturing Veteran Team

With the passing years, we are proud to build up a manufacturing veteran team with rich experience and full expertise to fulfill your specific demand. From mold making, injection molding, die casting, stamping and sheet metal, to 2nd processes like CNC machining, oil spraying, powder coating and chrome plating, and then assembling and packaging and related, we always have someone in house to be an expert to resolve the issues in different stages of product development. We also specialize in providing charger, cable and hub, plus other electronic accessories that support a complete set of product.

Strong Project Management

“Think global, execute local” is the principle of our work. Time, quality and cost are the three key elements to be considered throughout the product development from concept design to mass production. A detailed plan with weekly conference call update is a critical gateway to ensure these three key elements are successfully implemented, also assuring that all parties are on the same page. Communication is the Secret to Success . Everyone works independently to take care his own job, but together we are a team to get things done and are your daily eyes and ears onsite in China.

Flexible Operation & Customization

We offer a wide variety of products, such as mold, component and assembly product, and certain value-added services. For logo or branding product, we have in house resources to complete a color mix that can perfectly match a brand’s unique colors in fast and cost-effective way. Understood the client needs production parts but having a hard time to find a vendor since the order quantity is as low as 1000 or lower. GEMS is well set up for low volume injection molding or die casting projects. Surely our team is also capable of building SPI Class 101 mold that is designed & made for 1 million cycles or more of producing the same high quality parts consistently.