Plastic Parts

Plastic Parts

Quick Info

Plastic parts can be made in a wide range of shapes and sizes, from simple design to highly complex geometry, which allows them to be used in varied industries like consumer, healthcare, automotive, and medical and etc. With our combined experience and knowledge, GEMS-MFG has been providing plastic injection molding products to many clients for the past 25 years.

With in-house 37 injection molding machines ranging from 80 tons to 320 tons, we focus on the scientific molding of plastic injection approach, giving us greater production control than traditional molding methods, which may save significant amount of time, money and material for the customers. Below are some common materials used in our factory, such as PC, PET, PP, PBT, PS, ABS, PA, POM, PC, and many more.

Following to your AutoCAD, IGES, PDF, or SolidWorks files, our experienced manufacturing team is capable of making your custom products strictly to the specification and quality standards. No matter how complex your design is, we’ll devote ourselves to find the most efficient manufacturing solution to satisfy your needs. Get in touch with us GEMS-MFG immediately to fulfill your product demand with the full support of our capabilities.



  • A variety of plastic parts for personal care industry are created using the plastic injection molding process. A mold, an injection molding machine, and several kinds of plastic are required in this operation. Under high pressure, the plastic is injected into the mold, where it is allowed to cool and harden before taking on the required shape.
  • Plastic injection molding plays a significant role in the manufacturing of goods required by the personal care industry. Due to its versatility, effectiveness, and capacity to create complicated shapes, plastic injection molding is the most practical method for producing personal care products. GEMS-MFG team has a good demand of plastic injection molding technology, which bring values to design and produce a wide range of high-quality personal care products for our clients.


  • Two-shot mold refers to the mold in which two plastic materials are injected on the same injection molding machine and molded twice, but the product is formed with only one cycle. Generally, this molding process is also called double-material or double-color injection molding, which is usually completed by a set of molds and requires a special two-color injection molding machine.
  • Multi-shot and two-shot plastic injection moldings are efficient and cost-effective methods for molding customized plastic parts with two or more plastic resins or colors in a single operation. It is widely used to create plastic parts with soft-grip inserts, multiple colors, dashboards or handles, or with molded seals, flexible hinges, or moveable sections in multi-shot and two-shot plastic injection molding.
  • Two-color molds are becoming more and more popular in the market, as it can make the appearance of the product more beautiful and it is easy to change the color without spraying, but it has high requirements for design and injection molding.


  • Plastic injection overmolding is a process used to create parts by injecting molten plastic into a mold in which there are some pre-installed components. The overmolding component can be plastic or non-plastic parts, or metal inserts like a thread or rod.
  • Overmolding is a technique that combines plastic and metal, or multiple combinations of materials and components into a single unit. In addition to using metallic elements for strength and conductivity, the overmolding process also takes use of engineered plastics for increased wear resistance, tensile strength, and weight reduction.
  • It is most commonly used to create parts for home appliances, power tools, consumer products and automotive components. To learn more about our plastic injection overmolding capabilities for producing plastic parts around other components, please get in touch with us or submit a quote request right away.


  • Making a great quality automotive plastic injection mold is a highly specialized process that requires a strong foundation in engineering expertise and manufacturing experience. It is essential to guarantee that the automotive plastic injection molds are produced to the highest quality requirements, so as to assure that the automobile parts are to be injected or formed with the right shape in a high-speed and cost-effective manner.
  • Thanks to the outstanding advantages in affordability, reliability and simplicity, plastic parts are revolutionizing the whole automotive industry. To make their vehicles roadworthy, automakers must develop them to strict safety criteria and pass a number of certifications. As a result, it’s critical to pick the best plastic for any car parts made of plastic by injection molding.
  • Automobile Mold is widely used to make a wide range of components, such as instrument panels, frames, tubes, dashboards, bumpers, interior and exterior trim, and many more. If you are trying to find the right material or process for your automotive part, please feel free to talk to the experienced engineers at GEMS-MFG for professional advices.


  • When a plastic part features side holes, side grooves or side protrusions that block demolding, it is essential to develop a comparable core-pulling mechanism in the mold. Typically, the mold splitting is accomplished by drawing out the molded sliding core using a core-pulling mechanism. By doing this, the mold separation of moveable and fixed halves is no more hindered, as well as the avoidance of side core interference with the demolding of plastic parts.
  • Building a mold with sliders is usually supposed to be more complicated, as the engineering designer needs to face the challenge of core-pulling mechanism and putting all traditional components into the mold base with minimum size. A slider can be actuated in a variety of ways, but the most common method is to use a horn or angle pins to guide the slider as the mold opens or closes. If using standard hydraulic cylinder to guide the sliding core or heel block, we can benefit the less mold design and machining, as well as smaller mold size.


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, act 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.