Offers Plastic, Liquid Silicon And Metal Injection Molding Services.

Fast, low cost, small batch and mass production.Get custom plastic parts within days.

Custom Injection Molding Service

Need to produce parts in large quantities? Or small batches of parts for rapid testing in the market? Then our injection molding service is the right way. At Siedery, we can help our customers quickly test and verify functionality of their designs, and review the manufacturability. We can also provide you with high-volume plastic injection moulding services including insert molding, over molding, dual shots, etc.

Whether you need rapid molding or mold making for large-scale production, our injection molding experts can provide a cost-effective solution at every stage.

Our Strengths In The Injection Molding Industry.

The Reliability Of The Supplier Chosen Is Directly Related To The Quality Of The Product.

Experienced engineers.

Our injection molding engineers have experience working for multinational companies, are very familiar with technical parameters and have experience of thousands of projects, so they will be able to solve any problems for you immediately.

Advanced Equipment

With hundreds of imported as well as local top brand injection molding machines, we are able to produce the most accurate molds and the highest quality products.

Unlimited Production Capacity

In addition to our own factory facilities, we have established a strong production network with major manufacturers in China, with a full range of injection moulding machines from 10 tonnes to 1000 tonnes, to ensure that your orders are delivered on time and with high quality.

Our Injection Moulding Capabilities

Our experienced team ensures the injection molded products are produced at the highest quality. We combine injection molding with our rapid tooling capabilities, enabling us to produce customized parts quickly and efficiently. Our injection molding technology allows us to use a wider range of materials and a wider variety of surface finishes to meet the needs of any industry application.

Plastic injection molding 2022 picture

Plastic Injection Molding

The most popular process for plastics, thermoplastic injection molding is suitable for consumer products, automotive components, and everything in between.
Liquid Silicone Rubber Molding 2022 picture

Liquid Silicone Rubber Molding

Liquid silicone injection molding is ideal for creating fine, temperature-resistant parts, either alone or with over molding.
Metal Injection Molding 2022 picture

Metal Injection Molding

Suitable for small and fine metal parts, metal injection molding is cost-effective in large volumes and wastes less material than CNC machining.
Overmolding & Insert Molding 2022

Over Molding & Insert Molding

Over molding & Insert molding is not only reducing assembly and labor costs but also better than assembly part, reduces the size and weight of the part,it can be used in automobile, cooking ware, household equipment, instruments, devices, knobs, electrical components and more industrial.

Injection Molding Materials

We used hundreds of thermoplastic and thermoset materials. If you are look for a material but don't know much about it, please check out our guide to get the information on common materials used injection molding.

injection molding Materials
  • Acetal polyoxymethylene (POM)
  • Acrylonitrile butadiene styrene (ABS)
  • Nylon 66 (PA66)
  • Glass-filled, polyamide (PA-GF)
  • High-density polyethylene (HDPE)
  • Low-density polyethylene (LDPE)
  • Polybutylene terephthalate (PBT)
  • Polycarbonate (PC)
  • Glass-filled polycarbonate (PC-GF)
  • ABS polycarbonate (PC-ABS)
  • Polyethylene terephthalate (PET)
  • Polymethyl methacrylate (acrylic) (PMMA)
  • Polyphenylene sulfide (PPS)
  • Polypropylene (PP)
  • Polystyrene (PS)
  • Polystyrene + polyphenyl ethers (PS-PPE)
  • Thermoplastic elastomer (TPE)
  • Thermoplastic vulcanizates (TPV)

Finishing Options For Injection Molding

A suitable post-treatment process is to meet the product requirements ,in order to strengthen the part and improve the appearance.
  • Mold texturing & Polished
  • Custom color matching
  • Painting & Plating
  • Silk screening
  • Others
injection molding Finishing 2022 picture

Common Industry Applications

Injection moulding is often used to manufacture components for many industries, the most common industry applications are as follows.




Medical devices

Food containers


Plastic prototypes


What is injection molding?

Injection molding, also known as injection moulding, is a method of forming. The advantages of injection molding are fast and efficient production, automatic operation, a wide variety of colors, shapes from simple to complex, sizes from large to small, and accurate product sizes, easy to update products, and the ability to form very complex shaped parts. injection molding is suitable for mass production and manufacturing complex shaped products.

During injection molding, the molten resin is stirred by a screw at a certain temperature, and injected into the mold cavity at high pressure ,then cooled and cured to obtain a molded part. This method is suitable for the mass production of complex shaped parts and is one of the important processing methods in the manufacturing industry.

What is the injection molding process?

The injection molding process includes the preparation before molding, the injection process and the post-treatment of the molded part.

  1. Preparation
    The main preparations before injection molding are: inspection of raw material appearance and process performance, preheating and drying treatment; cleaning or replacement of the injection machine barrel; for the release of difficult plastic parts, preheating of the insert, some molds also need to be preheated.
  2.  Injection process
    The injection process is the main stage in the transformation of plastics into plastic parts. It includes several stages such as adding material, plasticising, injecting, holding pressure, cooling and shaping and demoulding.
  3.  Post-treatment of plastic parts
    Post-treatment can eliminate the existence of internal stress in the plastic parts, and can improve the performance of the plastic parts, improve the stability of the size. The post-treatment of plastic parts includes annealing and moisture conditioning. Annealing is a process whereby the molded part is placed in a heated liquid medium (such as hot water, hot mineral oil and liquid paraffin) at a fixed temperature or in a hot air circulation oven for a period of time and then slowly cooled. The aim is to relieve the internal stresses in the molded part and stabilize the dimensions. Humidification is a method of treating freshly demould plastic parts by placing them in hot water to isolate them from the air, prevent them from oxidizing and speed up the process of reaching a moisture absorption balance. The aim is to stabilize the colour and size of the molded part and to improve its properties.

What Are The Injection Moulding Process Conditions?

The most important factors in the injection moulding process conditions are temperature, pressure and time.

  1.  Temperature

    The main temperatures that need to be controlled in the injection moulding process are the barrel temperature, the nozzle temperature and the mould temperature.

    1) Barrel temperature
    The selection of barrel temperature is related to the variety and characteristics of the plastic. If the barrel temperature is too low, plasticization will not be sufficient; if the barrel temperature is too high, the plastic may be overheated and decomposed. The temperature distribution of the material is generally based on the principle of higher front end and lower back end, i.e. low temperature at the back end of the barrel and high temperature at the front end near the nozzle to prevent degradation of the plastic due to shear friction heat.

    2) Nozzle temperature
    The nozzle temperature is generally slightly lower than the maximum temperature of the barrel to prevent the melt from salivating at the nozzle due to high temperature.

    3) Mould temperature
    The mould temperature has a great influence on the flow of the melt, the cooling rate and the performance of the molded part. The temperature of the mould depends on the crystallinity of the plastic, the size and the performance of the molded part, mold structure, performance requirements and other process conditions (such as melt temperature, injection speed and injection pressure).

  2.  Pressure
    The pressure in the injection moulding process includes plasticizing pressure and injection pressure, which directly affect the plasticization of the plastic and the quality of the molded part.

    Plasticizing pressure, known as back pressure, is the pressure on the melt at the head of the screw when the screw is rotating backwards. Injection pressure is the pressure exerted by the plunger or screw head on the plastic melt. The value of the injection pressure depends on the plastic variety, the type of injection machine, the mould structure, the wall thickness of the plastic part and other process conditions.

  3.  Time
    The required time to complete an injection molding process is called the molding cycle. It includes mould filling time, holding time, mould cooling time and other time, such as mould opening, ejecting, mould release agent application, insert placement and mould closing time.

The Advantages Of Injection Moulding

Injection moulding is an excellent method for the mass production of plastic parts and products. It is easy to see that the world's top high-tech companies use injection moulding to produce parts for their products. What is it about injection moulding that makes it so popular?

Here we list some of its greatest advantages.

Production Efficiency

The mould injection process is very efficient and allows for the rapid production of large quantities of parts in a short period of time.

Low cost

The cost per component can be reduced significantly because it can be produced quickly and efficiently in high volumes. And cost advantages can beat the competition in a highly competitive market.

Excellent Details

The high pressure of the injection ensures that the molten material touches every void in the mould before it cures. This allows even the most complex products to be produced without fear of failure. The creative possibilities for the design engineer become very large.

High Volume Production Available

Injection molding with steel molds allows large quantities of parts to be produced in a short time and supplied to the market quickly.

Wide Selection Of Materials

A large number of plastic materials are available for the plastic injection moulding process. There are materials such as antistatic plastics, thermoplastic rubbers, chemically resistant plastics and bio-compostable materials which are colour-matched or masterbatch coloured.

Generates Less Waste

For injection moulding, the reproducibility factor of the parts is very high. Even straight sprue and runners can be reground for material reuse.
Plastic injection molding picture 6
Plastic injection molding picture 7
Plastic injection molding picture 5
Plastic injection molding picture 4
Metal Injection Molding pictures 3
Metal Injection Molding pictures 2
Metal Injection Molding pictures 1
Plastic injection molding picture 1
Plastic injection molding picture 2

Ready for Action?

We always win the trust of customers by delivering projects with high quality.
Get A Quote!

Founded in 2011, Siedery provides a one-stop shop for additive manufacturing and small-batch manufacturing services for small and medium-sized enterprises worldwide. We are experts in the CNC machining, injection molding, and 3D printing industries.
Building A3, Fuhai Information Port, Shenzhen, Guangdong, China
Powered by