Plastic Injection Molding Service

Tolerances as low as +-0.003mm
Global delivery as few as 10 days
Custom plastic molded prototypes & production parts

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Plastic Injection Molding Manufacturer

Runsom Precision is specialized in producing high-quality plastic injection molding parts and mold tools, we provide CNC machining and finishes services to make injection molding tools from various metal materials. Our capacity includes 50 to 100000 injection molded parts in a wide type of plastic materials. Compared with CNC machining and 3D printing, our injection molding service can provide the most variety of materials, colors, and configurations. In addition, we can also satisfy your customized cosmetics, polishes, and surface textures for aesthetic needs or technical requirements.

We guarantee your injection molding tools and parts exceed your expectations with advanced material verification and quality process management. We provide multiple options of injection molds for your exceptional production cycles and warranty, including “in-house” and “export” injection molds as your indeed requirement.

Why not upload your production design file for a competitive injection molding quote now?

How Does Plastic Injection Molding Work

To put it simply, the injection molding process can be simplified into four steps: melting the material, injecting it into the mold, cooling the material (or allowing it to cool) until it hardens, and then ejecting the final part from the mold.





Although this process seems to be easy and simple, there are many elements and factors needing taking into account to make sure every single piece of plastic component is fabricated precisely. To have an overall understanding of the process and crucial parameters, it’s necessary to know the elaboration of every stage below.

Explanation of How Plastic Injection Molding Works
Explanation of How Plastic Injection Molding Works

Advantages of Plastic Injection Molding

1. Efficiency

Plastic injection molding is a highly efficient process to quickly deal with large-volume orders.

3. Fineness

The molten material can reach every crevice of the mold under high pressure before solidifying, which enables engineers to incorporate sophisticated elements and complex geometric structures into their designs.

5. Volume production

Injection molding can be ideal for low-volume production of 250 units to high-volume production of over 1,000,000 units. Moreover, employing steel molds in injection molding can speed up the mass volume production of millions of identical parts.

2. High durability

The tensile strength of the molded parts may be enhanced by adding fillers into the liquid resin.

4. Cost-saving

This technique realizes efficient and productive production, making it possible to produce per part at a low cost. The cost can also be further lowered by selecting materials for injection mold tools that are cost-effective and readily available, such as aluminum.

6. Smooth finishes

The molded parts are ready for package and delivery with a neat finish that is unnecessary to be further processed when it’s removed from the mold.

Injection Molding Options for Plastic Part Production

Almost all thermoplastic can be used for plastic injection molding production. Runsom Precision provides flexible and rigid plastic varieties. Custom resin matching available is as follows:

Engineering plastics

Engineering plastics offer a range of sought-after properties, including good impact strength, rigidity, thermal resistance, chemical resistance, dimensionality, and color stability. The combination of strength, ductility, and heat resistance makes rigid plastics suitable for a range of industrial injection molding applications.


ABS PEI Nylon 6/6
Acrylic Polycarbonate PC-PBT
HDPE Polypropylene PEEK
Flexible Plastics
Rubber Plastics

Surface Finishes for Plastic Injection Molding

Surface Finishes for Plastic Injection Molding

Advantages of Plastic Injection Molding at Runsom Precision

High precision

Molds manufactured by our advanced CNC and EDM machines for plastic injection molding are highly precise and accurate to produce large quantities of production parts with small and intricate details.

No minimum order quantities

Whether you need to quickly test out the market with low-volume parts or want to create mass production molding of million units, we can all accept and help you to realize your design and boom your business.

Dust-free facilities

The production environment of injection molding is dust and temperature controlled to further guarantee the performance of molding.

Various secondary operations

We can offer you one-stop services from design and prototyping to final production and after service so as to create more flexibility and choices for our customers.

Sufficient materials options

There are numerous raw materials for both mold making and plastic injection molding. And you can always select the cost-effective and affordable materials with good properties to make molds.

Overall Technical Support

Our technical team will provide professional support for your needs as long as you have any questions or want to consult our experts in CNC machining and plastic injection molding.

Get a custom injection molding quote online and a design analysis today.

Applications of Plastic Injection Molding

Plastic Injection Molding Applications

Injection molding is widely used to produce various plastic parts for various sizes, complex shapes, and different use of applications. And it is also used in medical equipment and mechanical parts.

Plastic cases as the most common product are used widely in household appliances, consumer electronics, power tools, and car dashboards. Others like computer components, containers, bottle caps, car interiors, lenses, brackets, fasteners, top and bottom covers, and toys.

  • Production Parts
  • Bridge Tooling
  • Rapid Prototyping
  • Pilot Runs
  • Functional Testing

Injection Molding Design Tips

Injection Molding Design Tips

Professional design guidelines  provided by the engineering team at Runsom Precision are as follows: