Injection Molding Materials

Injection Molding Materials

Flourish Legend specializes in providing customers with one-stop injection molding solutions, including mold design, manufacturing, plastic injection molding, coating, silk-screen printing, and assembly. With a team of professional technicians and a well-established management system, we continuously enhance the competitiveness of our company and products, earning the satisfaction of our customers. Our products cover a wide range of industries, including the automotive sector, household appliances, medical devices, and 3C electronics. Flourish Legend warmly welcomes customers to visit us for business negotiations.

Types Of Injection Molding Materials Available

All Injection Molding Plastics

All Injection Molding Plastics

Injection molding is a common method of plastics processing and is suitable for a variety of material types. Common materials include polypropylene (PP) for corrosion resistance and thermal stability, polyethylene (PE) for packaging and piping, polyvinyl chloride (PVC) for construction and wire insulation, and polystyrene (PS) for Household and electronics, polycarbonate (PC) for transparent parts, nylon (PA) for mechanical parts, polyamide (PA66) for high-strength parts, polyphenylene sulfide (PPS) for high temperature and corrosion resistance, polyester ( PET) is used for bottled beverages and fibers, and polymethyl methacrylate (PMMA) is transparent and weather-resistant. These materials show their own unique characteristics during the injection molding process, and are widely used in different fields, such as home furnishing, automobiles, electronics, etc., to meet various needs.

How is the Process of Plastic Injection Molding?

How is the Process of Plastic Injection Molding?

How is the Process of Plastic Injection Molding?

How is the Process of Plastic Injection Molding?

Injection molding is a common plastic processing method used to manufacture various plastic products. Here are the steps involved in the custom injection molding process:

1. Mold Preparation:

   a. Design and manufacture the injection mold, including the fixed and moving molds.

   b. Ensure the accuracy, dimensions, and surface smoothness of the mold.

2. Plastic Pellet Feeding:

   a. Select suitable plastic pellets based on product requirements and characteristics.

   b. Load the plastic pellets into the hopper of the injection molding machine.

3. Heating and Melting:

   a. The injection molding machine feeds the plastic pellets into the heating barrel through a screw.

   b. Electric heaters in the heating barrel heat the plastic pellets above their melting point, melting them into a molten state.

4. Injection:

   a. The screw drive system pushes the molten plastic into the injection barrel.

   b. The injection molding machine injects the molten plastic into the cavity of the mold under pressure.

   c. The plastic fills the entire mold cavity to ensure replication of the product shape.

5. Cooling and Solidification:

   a. The plastic injected into the mold comes into contact with a cooling system, such as water or a coolant.

   b. The cooling system rapidly absorbs heat from the plastic, causing it to cool and solidify quickly.

   c. The cooling time is controlled based on the plastic type and product size.

6. Mold Opening and Ejection:

   a. After cooling and solidification, the mold opens, and the moving mold moves.

   b. Finished products are ejected from the mold using mechanical devices like ejector pins or suction cups.

   c. Additional processing may be required, such as removing flash or trimming edges.

7. Inspection and Quality Control:

   a. Visual inspection is conducted to ensure products meet specifications and quality requirements.

   b. Necessary measurements and tests, such as dimensional, appearance, and performance testing, are performed.

   c. Quality control and records are maintained to ensure compliance with standards.

8. Post-processing and Finishing:

   a. Post-processing steps like painting, silk-screen printing, or assembly are performed based on product requirements.

   b. Necessary machining and trimming are carried out to meet the final product requirements.

These are the detailed steps involved in the injection molding process, where each step requires precise operation and control to ensure product quality and consistency. If you have any injection molding needs, feel free to contact us.

How to Choose the Right Type of Plastic for Injection Molding?

Choosing the right type of plastic is crucial in the injection molding process as it directly impacts product performance, appearance, and manufacturing costs. Here are general steps for selecting plastic types in the injection molding process:

01 Determine
02 Research
03 Consider
04 Cost
05 Environmental
06 Testing
How to Choose the Right Type of Plastic for Injection Molding?


Identify the product's purpose and application, such as household items, automotive components, medical devices, etc. Determine the desired characteristics of the product, such as strength, stiffness, heat resistance, chemical resistance, transparency, etc.


Understand the properties and characteristics of different plastics, such as polypropylene (PP), polyethylene (PE), polystyrene (PS), etc. Research the physical properties, chemical properties, thermal performance, mechanical properties, and other parameters of the plastics.


Consider the requirements of the injection molding process for plastics, such as melting temperature, flowability, cooling rate, etc. Determine the capabilities and limitations of the injection molding machine to establish the melting temperature range and injection pressure requirements for the plastic.


Take into account the cost of different plastics, including raw material costs, processing costs, and post-processing costs. Compare the trade-off between the price and performance of different plastics to determine the most economically viable choice.


Consider the conditions the product will encounter in its usage environment, such as temperature, humidity, exposure to chemicals, etc. Ensure the selected plastic has sufficient weather resistance, corrosion resistance, and chemical stability.


Based on the previous steps, select several potential types of plastics, produce samples, and perform necessary testing and evaluation, such as physical tests, chemical tests, performance tests, etc. Assess the suitability of each plastic based on the test results and choose the most appropriate plastic type.


FAQs About Injection Molding Materials


Why Is the Injection Molding Process So Popular?


The reason why the injection molding process is popular with everyone is mainly due to the following reasons:

1. High production efficiency: The injection molding process can realize mass production, each molding cycle is short, and the production efficiency is high. This is very attractive for companies that require high-volume production, which can reduce production costs and increase the speed of product delivery.

2. High molding precision: The precision mold manufacturing can produce products with complex shapes and high precision. Through precise mold design and control systems, highly consistent product quality and dimensional accuracy can be achieved to meet various stringent requirements.

3. Wide selection of materials: Injection molding can use a variety of materials, such as plastic, rubber, metal powder, etc. Different materials can meet a variety of different product needs, including properties such as rigidity, softness, transparency, and flame retardancy.

4. Strong process flexibility: Injection molding can realize complex product design and structure, and can simultaneously inject multiple parts in the same mold. By adjusting the mold and process parameters, it can meet the requirements of different products and can be quickly adjusted and changed during the production process.

Less waste of resources: During the injection molding process, the waste of raw materials can usually be reduced. Waste materials and residual materials can be recycled, reducing environmental pollution and reducing production costs.

In general, the injection molding process has advantages in production efficiency, molding precision, material selection, process flexibility, and resource utilization, so it is deeply loved by everyone. It is widely used in various industries, including automobiles, electronics, home appliances, medical equipment, etc., and has become an indispensable part of modern industrial production.


What Are the Common Applications of Injection Molding?


Precision plastic injection molding is an plastic processing method widely used in various industries. Below are some common industries and fields where injection-molded products are widely used:

1. Automobile industry: Injection molding products play an important role in automobile manufacturing, including automotive interior parts, instrument panels, door panels, seat components, bumpers, lamps, etc.

2. Household and home appliances: Injection molding products are widely used in the field of home and home appliances, such as chairs, tables, storage boxes, TV casings, refrigerator parts, washing machine parts, etc.

3. Medical devices: The medical industry requires high-quality, durable, and sterilizable products, and injection molding provides an ideal solution for manufacturing medical devices and equipment, such as syringes, infusion sets, surgical instruments, implants, etc.

4. Packaging industry: Injection molded products are used in various packaging applications such as bottles, containers, jars, lids, boxes, etc.

5. Electronics and communication: Electronic products and communication equipment require precision plastic parts, and injection molding provides high-precision and complex-shaped manufacturing capabilities, such as mobile phone casings, keyboards, sockets, connectors, etc.

6. Construction and building materials: The application of injection molding products in the field of construction and building materials includes pipes, drainage systems, insulation materials, door and window frames, roof tiles, etc.

7. Cosmetics and personal care products: Injection molding is used to make cosmetic bottles, sprayers, containers, caps, etc.

8. Sports and leisure products: Many components and accessories in products such as sports equipment, outdoor products and toys are manufactured by injection molding, such as rackets, bicycle parts, skateboards, swimming accessories, etc.

These are just some examples of the application of injection molding products in different industries, in fact, injection molding products exist in almost every field because it provides efficient, economical, and diverse manufacturing solutions.

Flourish Legend - One-stop Manufacturing Solutions Expert
Prototyping, Mold Manufacturing, Injection Molding, CNC Machining, Sheet Metal Manufacturing, Stamping six business capabilities.

ISO International Quality Management System

Equipped with ISO 9001 certificate, we are able to support your OEM/ODM production.

Quality Control

We will check color, appearnce and tolerance by qulity control at every step during manufacturing process.

Low & High Volume Manufacturing

Besides high-volume production, we can also provide good solutions for your low-volume production (MOQ》1) with prototyping process.

Competitive Price

Our continuous investments in equipment and QC systems help us to get higher efficiency and quality which decrease reject ratio and increase market competitiveness in delivery qualified parts on time.

Reliability and Stability

Our 24 hours | 3 shifts production systems help your parts get into markets quickly and steadily.

Machining Services Related Articles